diff --git a/include/functions.h b/include/functions.h
index 052acebb1c..2efde4a706 100644
--- a/include/functions.h
+++ b/include/functions.h
@@ -605,15 +605,15 @@ u16 SSNodeList_GetNextNodeIdx(SSNodeList* this);
 s32 DynaPoly_IsBgIdBgActor(s32 bgId);
 void DynaPoly_Init(PlayState* play, DynaCollisionContext* dyna);
 void DynaPoly_Alloc(PlayState* play, DynaCollisionContext* dyna);
-void func_8003EBF8(PlayState* play, DynaCollisionContext* dyna, s32 bgId);
-void func_8003EC50(PlayState* play, DynaCollisionContext* dyna, s32 bgId);
-void func_8003ECA8(PlayState* play, DynaCollisionContext* dyna, s32 bgId);
+void DynaPoly_DisableCollision(PlayState* play, DynaCollisionContext* dyna, s32 bgId);
+void DynaPoly_EnableCollision(PlayState* play, DynaCollisionContext* dyna, s32 bgId);
+void DynaPoly_DisableCeilingCollision(PlayState* play, DynaCollisionContext* dyna, s32 bgId);
 s32 DynaPoly_SetBgActor(PlayState* play, DynaCollisionContext* dyna, Actor* actor, CollisionHeader* colHeader);
 DynaPolyActor* DynaPoly_GetActor(CollisionContext* colCtx, s32 bgId);
 void DynaPoly_DeleteBgActor(PlayState* play, DynaCollisionContext* dyna, s32 bgId);
-void func_8003EE6C(PlayState* play, DynaCollisionContext* dyna);
-void func_8003F8EC(PlayState* play, DynaCollisionContext* dyna, Actor* actor);
-void DynaPoly_Setup(PlayState* play, DynaCollisionContext* dyna);
+void DynaPoly_InvalidateLookup(PlayState* play, DynaCollisionContext* dyna);
+void DynaPoly_UnsetAllInteractFlags(PlayState* play, DynaCollisionContext* dyna, Actor* actor);
+void DynaPoly_UpdateContext(PlayState* play, DynaCollisionContext* dyna);
 void DynaPoly_UpdateBgActorTransforms(PlayState* play, DynaCollisionContext* dyna);
 f32 BgCheck_RaycastFloorDyna(DynaRaycast* dynaRaycast);
 s32 BgCheck_SphVsDynaWall(CollisionContext* colCtx, u16 xpFlags, f32* outX, f32* outZ, Vec3f* pos, f32 radius,
@@ -672,14 +672,14 @@ void BgCheck_DrawStaticCollision(PlayState*, CollisionContext*);
 void func_80043334(CollisionContext* colCtx, Actor* actor, s32 bgId);
 s32 func_800433A4(CollisionContext* colCtx, s32 bgId, Actor* actor);
 void DynaPolyActor_Init(DynaPolyActor* dynaActor, s32 flags);
-void func_800434A0(DynaPolyActor* dynaActor);
-void func_800434A8(DynaPolyActor* dynaActor);
-void func_800434C8(CollisionContext* colCtx, s32 floorBgId);
-void func_80043508(CollisionContext* colCtx, s32 floorBgId);
+void DynaPolyActor_UnsetAllInteractFlags(DynaPolyActor* dynaActor);
+void DynaPolyActor_SetActorOnTop(DynaPolyActor* dynaActor);
+void DynaPoly_SetPlayerOnTop(CollisionContext* colCtx, s32 floorBgId);
+void DynaPoly_SetPlayerAbove(CollisionContext* colCtx, s32 floorBgId);
 void func_80043538(DynaPolyActor* dynaActor);
-s32 func_80043548(DynaPolyActor* dynaActor);
-s32 func_8004356C(DynaPolyActor* dynaActor);
-s32 func_80043590(DynaPolyActor* dynaActor);
+s32 DynaPolyActor_IsActorOnTop(DynaPolyActor* dynaActor);
+s32 DynaPolyActor_IsPlayerOnTop(DynaPolyActor* dynaActor);
+s32 DynaPolyActor_IsPlayerAbove(DynaPolyActor* dynaActor);
 s32 func_800435B4(DynaPolyActor* dynaActor);
 s32 func_800435D8(PlayState* play, DynaPolyActor* dynaActor, s16 arg2, s16 arg3, s16 arg4);
 void Camera_Init(Camera* camera, View* view, CollisionContext* colCtx, PlayState* play);
diff --git a/include/z64actor.h b/include/z64actor.h
index 88c6b2e159..572ab9054a 100644
--- a/include/z64actor.h
+++ b/include/z64actor.h
@@ -254,6 +254,11 @@ if neither of the above are set : blue
 0x2000 : translucent, else opaque
 */
 
+#define DYNA_INTERACT_ACTOR_ON_TOP (1 << 0) // There is an actor standing on the collision of the dynapoly actor
+#define DYNA_INTERACT_PLAYER_ON_TOP (1 << 1) // The player actor is standing on the collision of the dynapoly actor
+#define DYNA_INTERACT_PLAYER_ABOVE (1 << 2) // The player is directly above the collision of the dynapoly actor (any distance above)
+#define DYNA_INTERACT_3 (1 << 3) // Like the ACTOR_ON_TOP flag but only actors with ACTOR_FLAG_26
+
 typedef struct DynaPolyActor {
     /* 0x000 */ struct Actor actor;
     /* 0x14C */ s32 bgId;
@@ -262,7 +267,7 @@ typedef struct DynaPolyActor {
     /* 0x158 */ s16 unk_158; // y rotation?
     /* 0x15A */ u16 unk_15A;
     /* 0x15C */ u32 unk_15C;
-    /* 0x160 */ u8 unk_160;
+    /* 0x160 */ u8 interactFlags;
     /* 0x162 */ s16 unk_162;
 } DynaPolyActor; // size = 0x164
 
diff --git a/include/z64bgcheck.h b/include/z64bgcheck.h
index 2f6811ee21..892ab925d9 100644
--- a/include/z64bgcheck.h
+++ b/include/z64bgcheck.h
@@ -155,10 +155,15 @@ typedef struct {
     /* 0x60 */ f32 maxY;
 } BgActor; // size = 0x64
 
+#define BGACTOR_IN_USE (1 << 0) // The bgActor entry is in use
+#define BGACTOR_1 (1 << 1)
+#define BGACTOR_COLLISION_DISABLED (1 << 2) // The collision of the bgActor is disabled
+#define BGACTOR_CEILING_COLLISION_DISABLED (1 << 3) // The ceilings in the collision of the bgActor are ignored
+
 typedef struct {
     /* 0x0000 */ u8 bitFlag;
     /* 0x0004 */ BgActor bgActors[BG_ACTOR_MAX];
-    /* 0x138C */ u16 bgActorFlags[BG_ACTOR_MAX]; // & 0x0008 = no dyna ceiling
+    /* 0x138C */ u16 bgActorFlags[BG_ACTOR_MAX];
     /* 0x13F0 */ CollisionPoly* polyList;
     /* 0x13F4 */ Vec3s* vtxList;
     /* 0x13F8 */ DynaSSNodeList polyNodes;
diff --git a/src/code/code_800430A0.c b/src/code/code_800430A0.c
index 95c7c4fc5d..95f7455ba6 100644
--- a/src/code/code_800430A0.c
+++ b/src/code/code_800430A0.c
@@ -60,7 +60,7 @@ void func_80043334(CollisionContext* colCtx, Actor* actor, s32 bgId) {
     if (DynaPoly_IsBgIdBgActor(bgId)) {
         DynaPolyActor* dynaActor = DynaPoly_GetActor(colCtx, bgId);
         if (dynaActor != NULL) {
-            func_800434A8(dynaActor);
+            DynaPolyActor_SetActorOnTop(dynaActor);
 
             if (CHECK_FLAG_ALL(actor->flags, ACTOR_FLAG_26)) {
                 func_80043538(dynaActor);
@@ -81,7 +81,7 @@ s32 func_800433A4(CollisionContext* colCtx, s32 bgId, Actor* actor) {
         return false;
     }
 
-    if ((colCtx->dyna.bgActorFlags[bgId] & 2) || !(colCtx->dyna.bgActorFlags[bgId] & 1)) {
+    if ((colCtx->dyna.bgActorFlags[bgId] & BGACTOR_1) || !(colCtx->dyna.bgActorFlags[bgId] & BGACTOR_IN_USE)) {
         return false;
     }
 
diff --git a/src/code/code_80043480.c b/src/code/code_80043480.c
index 3ba733e267..bcf2e0dd99 100644
--- a/src/code/code_80043480.c
+++ b/src/code/code_80043480.c
@@ -3,65 +3,65 @@
 void DynaPolyActor_Init(DynaPolyActor* dynaActor, s32 flags) {
     dynaActor->bgId = -1;
     dynaActor->unk_15C = flags;
-    dynaActor->unk_160 = 0;
+    dynaActor->interactFlags = 0;
     dynaActor->unk_150 = 0.0f;
     dynaActor->unk_154 = 0.0f;
 }
 
-void func_800434A0(DynaPolyActor* dynaActor) {
-    dynaActor->unk_160 = 0;
+void DynaPolyActor_UnsetAllInteractFlags(DynaPolyActor* dynaActor) {
+    dynaActor->interactFlags = 0;
 }
 
-void func_800434A8(DynaPolyActor* dynaActor) {
-    dynaActor->unk_160 |= 1;
+void DynaPolyActor_SetActorOnTop(DynaPolyActor* dynaActor) {
+    dynaActor->interactFlags |= DYNA_INTERACT_ACTOR_ON_TOP;
 }
 
-void func_800434B8(DynaPolyActor* dynaActor) {
-    dynaActor->unk_160 |= 2;
+void DynaPolyActor_SetPlayerOnTop(DynaPolyActor* dynaActor) {
+    dynaActor->interactFlags |= DYNA_INTERACT_PLAYER_ON_TOP;
 }
 
-void func_800434C8(CollisionContext* colCtx, s32 floorBgId) {
+void DynaPoly_SetPlayerOnTop(CollisionContext* colCtx, s32 floorBgId) {
     DynaPolyActor* dynaActor = DynaPoly_GetActor(colCtx, floorBgId);
 
     if (dynaActor != NULL) {
-        func_800434B8(dynaActor);
+        DynaPolyActor_SetPlayerOnTop(dynaActor);
     }
 }
 
-void func_800434F8(DynaPolyActor* dynaActor) {
-    dynaActor->unk_160 |= 4;
+void DynaPolyActor_SetPlayerAbove(DynaPolyActor* dynaActor) {
+    dynaActor->interactFlags |= DYNA_INTERACT_PLAYER_ABOVE;
 }
 
-void func_80043508(CollisionContext* colCtx, s32 floorBgId) {
+void DynaPoly_SetPlayerAbove(CollisionContext* colCtx, s32 floorBgId) {
     DynaPolyActor* dynaActor = DynaPoly_GetActor(colCtx, floorBgId);
 
     if (dynaActor != NULL) {
-        func_800434F8(dynaActor);
+        DynaPolyActor_SetPlayerAbove(dynaActor);
     }
 }
 
 void func_80043538(DynaPolyActor* dynaActor) {
-    dynaActor->unk_160 |= 8;
+    dynaActor->interactFlags |= DYNA_INTERACT_3;
 }
 
-s32 func_80043548(DynaPolyActor* dynaActor) {
-    if (dynaActor->unk_160 & 1) {
+s32 DynaPolyActor_IsActorOnTop(DynaPolyActor* dynaActor) {
+    if (dynaActor->interactFlags & DYNA_INTERACT_ACTOR_ON_TOP) {
         return true;
     } else {
         return false;
     }
 }
 
-s32 func_8004356C(DynaPolyActor* dynaActor) {
-    if (dynaActor->unk_160 & 2) {
+s32 DynaPolyActor_IsPlayerOnTop(DynaPolyActor* dynaActor) {
+    if (dynaActor->interactFlags & DYNA_INTERACT_PLAYER_ON_TOP) {
         return true;
     } else {
         return false;
     }
 }
 
-s32 func_80043590(DynaPolyActor* dynaActor) {
-    if (dynaActor->unk_160 & 4) {
+s32 DynaPolyActor_IsPlayerAbove(DynaPolyActor* dynaActor) {
+    if (dynaActor->interactFlags & DYNA_INTERACT_PLAYER_ABOVE) {
         return true;
     } else {
         return false;
@@ -69,7 +69,7 @@ s32 func_80043590(DynaPolyActor* dynaActor) {
 }
 
 s32 func_800435B4(DynaPolyActor* dynaActor) {
-    if (dynaActor->unk_160 & 8) {
+    if (dynaActor->interactFlags & DYNA_INTERACT_3) {
         return true;
     } else {
         return false;
diff --git a/src/code/z_actor.c b/src/code/z_actor.c
index 8db84b82da..f51414eabe 100644
--- a/src/code/z_actor.c
+++ b/src/code/z_actor.c
@@ -2111,7 +2111,7 @@ void Actor_UpdateAll(PlayState* play, ActorContext* actorCtx) {
                         actor->colorFilterTimer--;
                     }
                     actor->update(actor, play);
-                    func_8003F8EC(play, &play->colCtx.dyna, actor);
+                    DynaPoly_UnsetAllInteractFlags(play, &play->colCtx.dyna, actor);
                 }
 
                 CollisionCheck_ResetDamage(&actor->colChkInfo);
@@ -2121,7 +2121,7 @@ void Actor_UpdateAll(PlayState* play, ActorContext* actorCtx) {
         }
 
         if (i == ACTORCAT_BG) {
-            DynaPoly_Setup(play, &play->colCtx.dyna);
+            DynaPoly_UpdateContext(play, &play->colCtx.dyna);
         }
     }
 
diff --git a/src/code/z_bgcheck.c b/src/code/z_bgcheck.c
index 640066358f..55ee74b8aa 100644
--- a/src/code/z_bgcheck.c
+++ b/src/code/z_bgcheck.c
@@ -1623,7 +1623,7 @@ CollisionHeader* BgCheck_GetCollisionHeader(CollisionContext* colCtx, s32 bgId)
     if (bgId < 0 || bgId > BG_ACTOR_MAX) {
         return NULL;
     }
-    if (!(colCtx->dyna.bgActorFlags[bgId] & 1)) {
+    if (!(colCtx->dyna.bgActorFlags[bgId] & BGACTOR_IN_USE)) {
         osSyncPrintf(VT_COL(YELLOW, BLACK));
         osSyncPrintf("T_BGCheck_getBGDataInfo():そのbg_actor_indexは使われておりません。index=%d\n");
         osSyncPrintf(VT_RST);
@@ -2626,8 +2626,8 @@ s32 DynaPoly_SetBgActor(PlayState* play, DynaCollisionContext* dyna, Actor* acto
     s32 foundSlot = false;
 
     for (bgId = 0; bgId < BG_ACTOR_MAX; bgId++) {
-        if (!(dyna->bgActorFlags[bgId] & 1)) {
-            dyna->bgActorFlags[bgId] |= 1;
+        if (!(dyna->bgActorFlags[bgId] & BGACTOR_IN_USE)) {
+            dyna->bgActorFlags[bgId] |= BGACTOR_IN_USE;
             foundSlot = true;
             break;
         }
@@ -2643,7 +2643,7 @@ s32 DynaPoly_SetBgActor(PlayState* play, DynaCollisionContext* dyna, Actor* acto
     BgActor_SetActor(&dyna->bgActors[bgId], actor, colHeader);
     dyna->bitFlag |= DYNAPOLY_INVALIDATE_LOOKUP;
 
-    dyna->bgActorFlags[bgId] &= ~2;
+    dyna->bgActorFlags[bgId] &= ~BGACTOR_1;
     osSyncPrintf(VT_FGCOL(GREEN));
     osSyncPrintf("DynaPolyInfo_setActor():index %d\n", bgId);
     osSyncPrintf(VT_RST);
@@ -2655,37 +2655,37 @@ s32 DynaPoly_SetBgActor(PlayState* play, DynaCollisionContext* dyna, Actor* acto
  * possible orginal name: DynaPolyInfo_getActor
  */
 DynaPolyActor* DynaPoly_GetActor(CollisionContext* colCtx, s32 bgId) {
-    if (!DynaPoly_IsBgIdBgActor(bgId) || !(colCtx->dyna.bgActorFlags[bgId] & 1) ||
-        colCtx->dyna.bgActorFlags[bgId] & 2) {
+    if (!DynaPoly_IsBgIdBgActor(bgId) || !(colCtx->dyna.bgActorFlags[bgId] & BGACTOR_IN_USE) ||
+        colCtx->dyna.bgActorFlags[bgId] & BGACTOR_1) {
         return NULL;
     }
     return (DynaPolyActor*)colCtx->dyna.bgActors[bgId].actor;
 }
 
-void func_8003EBF8(PlayState* play, DynaCollisionContext* dyna, s32 bgId) {
+void DynaPoly_DisableCollision(PlayState* play, DynaCollisionContext* dyna, s32 bgId) {
     if (DynaPoly_IsBgIdBgActor(bgId)) {
-        dyna->bgActorFlags[bgId] |= 4;
+        dyna->bgActorFlags[bgId] |= BGACTOR_COLLISION_DISABLED;
         dyna->bitFlag |= DYNAPOLY_INVALIDATE_LOOKUP;
     }
 }
 
-void func_8003EC50(PlayState* play, DynaCollisionContext* dyna, s32 bgId) {
+void DynaPoly_EnableCollision(PlayState* play, DynaCollisionContext* dyna, s32 bgId) {
     if (DynaPoly_IsBgIdBgActor(bgId)) {
-        dyna->bgActorFlags[bgId] &= ~4;
+        dyna->bgActorFlags[bgId] &= ~BGACTOR_COLLISION_DISABLED;
         dyna->bitFlag |= DYNAPOLY_INVALIDATE_LOOKUP;
     }
 }
 
-void func_8003ECA8(PlayState* play, DynaCollisionContext* dyna, s32 bgId) {
+void DynaPoly_DisableCeilingCollision(PlayState* play, DynaCollisionContext* dyna, s32 bgId) {
     if (DynaPoly_IsBgIdBgActor(bgId)) {
-        dyna->bgActorFlags[bgId] |= 8;
+        dyna->bgActorFlags[bgId] |= BGACTOR_CEILING_COLLISION_DISABLED;
         dyna->bitFlag |= DYNAPOLY_INVALIDATE_LOOKUP;
     }
 }
 
-void func_8003ED00(PlayState* play, DynaCollisionContext* dyna, s32 bgId) {
+void DynaPoly_EnableCeilingCollision(PlayState* play, DynaCollisionContext* dyna, s32 bgId) {
     if (DynaPoly_IsBgIdBgActor(bgId)) {
-        dyna->bgActorFlags[bgId] &= ~8;
+        dyna->bgActorFlags[bgId] &= ~BGACTOR_CEILING_COLLISION_DISABLED;
         dyna->bitFlag |= DYNAPOLY_INVALIDATE_LOOKUP;
     }
 }
@@ -2723,19 +2723,19 @@ void DynaPoly_DeleteBgActor(PlayState* play, DynaCollisionContext* dyna, s32 bgI
 
         actor->bgId = BGACTOR_NEG_ONE;
         dyna->bgActors[bgId].actor = NULL;
-        dyna->bgActorFlags[bgId] |= 2;
+        dyna->bgActorFlags[bgId] |= BGACTOR_1;
     }
 }
 
-void func_8003EE6C(PlayState* play, DynaCollisionContext* dyna) {
+void DynaPoly_InvalidateLookup(PlayState* play, DynaCollisionContext* dyna) {
     dyna->bitFlag |= DYNAPOLY_INVALIDATE_LOOKUP;
 }
 
 /**
  * original name: DynaPolyInfo_expandSRT
  */
-void DynaPoly_ExpandSRT(PlayState* play, DynaCollisionContext* dyna, s32 bgId, s32* vtxStartIndex,
-                        s32* polyStartIndex) {
+void DynaPoly_AddBgActorToLookup(PlayState* play, DynaCollisionContext* dyna, s32 bgId, s32* vtxStartIndex,
+                                 s32* polyStartIndex) {
     MtxF mtx;
     Actor* actor;
     s32 pad;
@@ -2765,7 +2765,7 @@ void DynaPoly_ExpandSRT(PlayState* play, DynaCollisionContext* dyna, s32 bgId, s
 
     ScaleRotPos_SetValue(&dyna->bgActors[bgId].curTransform, &actor->scale, &actor->shape.rot, &pos);
 
-    if (dyna->bgActorFlags[bgId] & 4) {
+    if (dyna->bgActorFlags[bgId] & BGACTOR_COLLISION_DISABLED) {
         return;
     }
 
@@ -2799,7 +2799,7 @@ void DynaPoly_ExpandSRT(PlayState* play, DynaCollisionContext* dyna, s32 bgId, s
                 s16 polyIndex = pi;
                 DynaSSNodeList_SetSSListHead(&dyna->polyNodes, &dyna->bgActors[bgId].dynaLookup.floor, &polyIndex);
             } else if (normalY < COLPOLY_SNORMAL(-0.8f)) {
-                if (!(dyna->bgActorFlags[bgId] & 8)) {
+                if (!(dyna->bgActorFlags[bgId] & BGACTOR_CEILING_COLLISION_DISABLED)) {
                     s16 polyIndex = pi;
                     DynaSSNodeList_SetSSListHead(&dyna->polyNodes, &dyna->bgActors[bgId].dynaLookup.ceiling,
                                                  &polyIndex);
@@ -2915,15 +2915,15 @@ void DynaPoly_ExpandSRT(PlayState* play, DynaCollisionContext* dyna, s32 bgId, s
     }
 }
 
-void func_8003F8EC(PlayState* play, DynaCollisionContext* dyna, Actor* actor) {
+void DynaPoly_UnsetAllInteractFlags(PlayState* play, DynaCollisionContext* dyna, Actor* actor) {
     DynaPolyActor* dynaActor;
     s32 i;
 
     for (i = 0; i < BG_ACTOR_MAX; i++) {
-        if (dyna->bgActorFlags[i] & 1) {
+        if (dyna->bgActorFlags[i] & BGACTOR_IN_USE) {
             dynaActor = DynaPoly_GetActor(&play->colCtx, i);
             if (dynaActor != NULL && &dynaActor->actor == actor) {
-                func_800434A0((DynaPolyActor*)actor);
+                DynaPolyActor_UnsetAllInteractFlags((DynaPolyActor*)actor);
                 return;
             }
         }
@@ -2931,9 +2931,9 @@ void func_8003F8EC(PlayState* play, DynaCollisionContext* dyna, Actor* actor) {
 }
 
 /**
- * DynaPolyInfo_setup
+ * Original name: "DynaPolyInfo_setup"
  */
-void DynaPoly_Setup(PlayState* play, DynaCollisionContext* dyna) {
+void DynaPoly_UpdateContext(PlayState* play, DynaCollisionContext* dyna) {
     DynaPolyActor* actor;
     s32 vtxStartIndex;
     s32 polyStartIndex;
@@ -2946,7 +2946,7 @@ void DynaPoly_Setup(PlayState* play, DynaCollisionContext* dyna) {
     }
 
     for (i = 0; i < BG_ACTOR_MAX; i++) {
-        if (dyna->bgActorFlags[i] & 2) {
+        if (dyna->bgActorFlags[i] & BGACTOR_1) {
             // Initialize BgActor
             osSyncPrintf(VT_FGCOL(GREEN));
             osSyncPrintf("DynaPolyInfo_setup():削除 index=%d\n", i);
@@ -2975,8 +2975,8 @@ void DynaPoly_Setup(PlayState* play, DynaCollisionContext* dyna) {
     vtxStartIndex = 0;
     polyStartIndex = 0;
     for (i = 0; i < BG_ACTOR_MAX; i++) {
-        if (dyna->bgActorFlags[i] & 1) {
-            DynaPoly_ExpandSRT(play, dyna, i, &vtxStartIndex, &polyStartIndex);
+        if (dyna->bgActorFlags[i] & BGACTOR_IN_USE) {
+            DynaPoly_AddBgActorToLookup(play, dyna, i, &vtxStartIndex, &polyStartIndex);
         }
     }
     dyna->bitFlag &= ~DYNAPOLY_INVALIDATE_LOOKUP;
@@ -2989,7 +2989,7 @@ void DynaPoly_UpdateBgActorTransforms(PlayState* play, DynaCollisionContext* dyn
     s32 i;
 
     for (i = 0; i < BG_ACTOR_MAX; i++) {
-        if (dyna->bgActorFlags[i] & 1) {
+        if (dyna->bgActorFlags[i] & BGACTOR_IN_USE) {
             DynaPoly_SetBgActorPrevTransform(play, &dyna->bgActors[i]);
         }
     }
@@ -3081,7 +3081,7 @@ f32 BgCheck_RaycastFloorDyna(DynaRaycast* dynaRaycast) {
     *dynaRaycast->bgId = BGCHECK_SCENE;
 
     for (i = 0; i < BG_ACTOR_MAX; i++) {
-        if (!(dynaRaycast->colCtx->dyna.bgActorFlags[i] & 1)) {
+        if (!(dynaRaycast->colCtx->dyna.bgActorFlags[i] & BGACTOR_IN_USE)) {
             continue;
         }
 
@@ -3134,7 +3134,7 @@ f32 BgCheck_RaycastFloorDyna(DynaRaycast* dynaRaycast) {
         if (pauseState == 0) {
             pauseState = dynaRaycast->play->pauseCtx.debugState != 0;
         }
-        if (!pauseState && (dynaRaycast->colCtx->dyna.bgActorFlags[*dynaRaycast->bgId] & 2)) {
+        if (!pauseState && (dynaRaycast->colCtx->dyna.bgActorFlags[*dynaRaycast->bgId] & BGACTOR_1)) {
             curTransform = &dynaRaycast->dyna->bgActors[*dynaRaycast->bgId].curTransform;
             polyMin =
                 &dynaRaycast->dyna->polyList[dynaRaycast->dyna->bgActors[*dynaRaycast->bgId].dynaLookup.polyStartIndex];
@@ -3387,7 +3387,7 @@ s32 BgCheck_SphVsDynaWall(CollisionContext* colCtx, u16 xpFlags, f32* outX, f32*
     resultPos = *pos;
 
     for (i = 0; i < BG_ACTOR_MAX; i++) {
-        if (!(colCtx->dyna.bgActorFlags[i] & 1)) {
+        if (!(colCtx->dyna.bgActorFlags[i] & BGACTOR_IN_USE)) {
             continue;
         }
         if ((colCtx->dyna.bgActors + i)->actor == actor) {
@@ -3506,7 +3506,7 @@ s32 BgCheck_CheckDynaCeiling(CollisionContext* colCtx, u16 xpFlags, f32* outY, V
     resultY = tempY;
 
     for (i = 0; i < BG_ACTOR_MAX; i++) {
-        if (!(colCtx->dyna.bgActorFlags[i] & 1)) {
+        if (!(colCtx->dyna.bgActorFlags[i] & BGACTOR_IN_USE)) {
             continue;
         }
         if (actor == colCtx->dyna.bgActors[i].actor) {
@@ -3641,7 +3641,7 @@ s32 BgCheck_CheckLineAgainstDyna(CollisionContext* colCtx, u16 xpFlags, Vec3f* p
     f32 by;
 
     for (i = 0; i < BG_ACTOR_MAX; i++) {
-        if (colCtx->dyna.bgActorFlags[i] & 1) {
+        if (colCtx->dyna.bgActorFlags[i] & BGACTOR_IN_USE) {
             if (actor != colCtx->dyna.bgActors[i].actor) {
                 ay = posA->y;
                 by = posB->y;
@@ -3745,7 +3745,7 @@ s32 BgCheck_SphVsFirstDynaPoly(CollisionContext* colCtx, u16 xpFlags, CollisionP
     Sphere16 testSphere;
 
     for (i = 0; i < BG_ACTOR_MAX; i++) {
-        if (!(colCtx->dyna.bgActorFlags[i] & 1)) {
+        if (!(colCtx->dyna.bgActorFlags[i] & BGACTOR_IN_USE)) {
             continue;
         }
         if (colCtx->dyna.bgActors[i].actor == actor) {
@@ -3794,7 +3794,7 @@ void func_800418D0(CollisionContext* colCtx, PlayState* play) {
 
     for (i = 0; i < BG_ACTOR_MAX; i++) {
         flag = dyna->bgActorFlags[i];
-        if ((flag & 1) && !(flag & 2)) {
+        if ((flag & BGACTOR_IN_USE) && !(flag & BGACTOR_1)) {
             Actor_SetObjectDependency(play, dyna->bgActors[i].actor);
             CollisionHeader_SegmentedToVirtual(dyna->bgActors[i].colHeader);
         }
@@ -4453,7 +4453,7 @@ void BgCheck_DrawDynaCollision(PlayState* play, CollisionContext* colCtx) {
 
     for (bgId = 0; bgId < BG_ACTOR_MAX; bgId++) {
 
-        if (!(colCtx->dyna.bgActorFlags[bgId] & 1)) {
+        if (!(colCtx->dyna.bgActorFlags[bgId] & BGACTOR_IN_USE)) {
             continue;
         }
         BgCheck_DrawBgActor(play, colCtx, bgId);
diff --git a/src/code/z_en_a_keep.c b/src/code/z_en_a_keep.c
index 3b20cec82b..190619c12f 100644
--- a/src/code/z_en_a_keep.c
+++ b/src/code/z_en_a_keep.c
@@ -113,7 +113,7 @@ void EnAObj_Init(Actor* thisx, PlayState* play) {
 
     thisx->focus.pos = thisx->world.pos;
     this->dyna.bgId = BGACTOR_NEG_ONE;
-    this->dyna.unk_160 = 0;
+    this->dyna.interactFlags = 0;
     this->dyna.unk_15C = DPM_UNK;
     thisx->uncullZoneDownward = 1200.0f;
     thisx->uncullZoneScale = 200.0f;
@@ -224,7 +224,7 @@ void EnAObj_SetupBlockRot(EnAObj* this, s16 type) {
 
 void EnAObj_BlockRot(EnAObj* this, PlayState* play) {
     if (this->rotateState == 0) {
-        if (this->dyna.unk_160 != 0) {
+        if (this->dyna.interactFlags != 0) {
             this->rotateState++;
             this->rotateForTimer = 20;
 
diff --git a/src/code/z_en_item00.c b/src/code/z_en_item00.c
index b5ef85d817..e4d09def76 100644
--- a/src/code/z_en_item00.c
+++ b/src/code/z_en_item00.c
@@ -560,7 +560,7 @@ void EnItem00_Update(Actor* thisx, PlayState* play) {
                 D_80157D90 = play->gameplayFrames;
                 D_80157D94[0] = 0;
                 for (i = 0; i < 50; i++) {
-                    if (play->colCtx.dyna.bgActorFlags[i] & 1) {
+                    if (play->colCtx.dyna.bgActorFlags[i] & BGACTOR_IN_USE) {
                         dynaActor = play->colCtx.dyna.bgActors[i].actor;
                         if ((dynaActor != NULL) && (dynaActor->update != NULL)) {
                             if ((dynaActor->world.pos.x != dynaActor->prevPos.x) ||
diff --git a/src/overlays/actors/ovl_Bg_Bdan_Objects/z_bg_bdan_objects.c b/src/overlays/actors/ovl_Bg_Bdan_Objects/z_bg_bdan_objects.c
index 271c012dc7..471cf5fbfe 100644
--- a/src/overlays/actors/ovl_Bg_Bdan_Objects/z_bg_bdan_objects.c
+++ b/src/overlays/actors/ovl_Bg_Bdan_Objects/z_bg_bdan_objects.c
@@ -325,7 +325,7 @@ void func_8086C6EC(BgBdanObjects* this, PlayState* play) {
 }
 
 void func_8086C76C(BgBdanObjects* this, PlayState* play) {
-    if (func_8004356C(&this->dyna)) {
+    if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
         if (this->dyna.actor.xzDistToPlayer < 120.0f) {
             this->actionFunc = func_8086C7D0;
             OnePointCutscene_Init(play, 3090, -99, &this->dyna.actor, CAM_ID_MAIN);
@@ -351,7 +351,7 @@ void func_8086C874(BgBdanObjects* this, PlayState* play) {
         this->timer--;
     }
     if (this->switchFlag == 0) {
-        if (func_8004356C(&this->dyna)) {
+        if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
             this->cameraSetting = play->cameraPtrs[CAM_ID_MAIN]->setting;
             Camera_ChangeSetting(play->cameraPtrs[CAM_ID_MAIN], CAM_SET_NORMAL2);
             func_8005AD1C(play->cameraPtrs[CAM_ID_MAIN], 4);
@@ -359,7 +359,7 @@ void func_8086C874(BgBdanObjects* this, PlayState* play) {
         }
     } else {
         Camera_ChangeSetting(play->cameraPtrs[CAM_ID_MAIN], CAM_SET_NORMAL2);
-        if (!func_8004356C(&this->dyna)) {
+        if (!DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
             if (this->switchFlag != 0) {
                 this->switchFlag--;
             }
@@ -411,7 +411,7 @@ void func_8086CABC(BgBdanObjects* this, PlayState* play) {
 }
 
 void func_8086CB10(BgBdanObjects* this, PlayState* play) {
-    if (func_8004356C(&this->dyna)) {
+    if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
         Flags_SetSwitch(play, this->switchFlag);
         this->timer = 50;
         this->actionFunc = func_8086CB8C;
diff --git a/src/overlays/actors/ovl_Bg_Bdan_Switch/z_bg_bdan_switch.c b/src/overlays/actors/ovl_Bg_Bdan_Switch/z_bg_bdan_switch.c
index ca99d6376d..e5aed1b8fe 100644
--- a/src/overlays/actors/ovl_Bg_Bdan_Switch/z_bg_bdan_switch.c
+++ b/src/overlays/actors/ovl_Bg_Bdan_Switch/z_bg_bdan_switch.c
@@ -254,7 +254,7 @@ void func_8086D5E0(BgBdanSwitch* this, PlayState* play) {
             }
             break;
         case YELLOW:
-            if (func_8004356C(&this->dyna)) {
+            if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
                 func_8086D67C(this);
                 func_8086D4B4(this, play);
             }
@@ -322,7 +322,7 @@ void func_8086D86C(BgBdanSwitch* this) {
 }
 
 void func_8086D888(BgBdanSwitch* this, PlayState* play) {
-    if (func_8004356C(&this->dyna)) {
+    if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
         func_8086D8BC(this);
     }
 }
@@ -365,7 +365,7 @@ void func_8086D9F8(BgBdanSwitch* this) {
 void func_8086DA1C(BgBdanSwitch* this, PlayState* play) {
     Actor* heldActor = GET_PLAYER(play)->heldActor;
 
-    if (func_8004356C(&this->dyna)) {
+    if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
         if (heldActor != NULL && heldActor->id == ACTOR_EN_RU1) {
             if (this->unk_1D8 <= 0) {
                 func_8086D944(this);
diff --git a/src/overlays/actors/ovl_Bg_Gjyo_Bridge/z_bg_gjyo_bridge.c b/src/overlays/actors/ovl_Bg_Gjyo_Bridge/z_bg_gjyo_bridge.c
index 5418669f37..3bc57deb0b 100644
--- a/src/overlays/actors/ovl_Bg_Gjyo_Bridge/z_bg_gjyo_bridge.c
+++ b/src/overlays/actors/ovl_Bg_Gjyo_Bridge/z_bg_gjyo_bridge.c
@@ -53,7 +53,7 @@ void BgGjyoBridge_Init(Actor* thisx, PlayState* play) {
         this->actionFunc = func_808787A4;
     } else {
         this->dyna.actor.draw = NULL;
-        func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
         this->actionFunc = BgGjyoBridge_TriggerCutscene;
     }
 }
@@ -84,7 +84,7 @@ void BgGjyoBridge_SpawnBridge(BgGjyoBridge* this, PlayState* play) {
     if ((play->csCtx.state != CS_STATE_IDLE) && (play->csCtx.npcActions[2] != NULL) &&
         (play->csCtx.npcActions[2]->action == 2)) {
         this->dyna.actor.draw = BgGjyoBridge_Draw;
-        func_8003EC50(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_EnableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
         SET_EVENTCHKINF(EVENTCHKINF_4D);
     }
 }
diff --git a/src/overlays/actors/ovl_Bg_Gnd_Darkmeiro/z_bg_gnd_darkmeiro.c b/src/overlays/actors/ovl_Bg_Gnd_Darkmeiro/z_bg_gnd_darkmeiro.c
index 977963a651..ee3c834fbb 100644
--- a/src/overlays/actors/ovl_Bg_Gnd_Darkmeiro/z_bg_gnd_darkmeiro.c
+++ b/src/overlays/actors/ovl_Bg_Gnd_Darkmeiro/z_bg_gnd_darkmeiro.c
@@ -36,11 +36,11 @@ const ActorInit Bg_Gnd_Darkmeiro_InitVars = {
 void BgGndDarkmeiro_ToggleBlock(BgGndDarkmeiro* this, PlayState* play) {
     if (this->actionFlags & 2) {
         if (this->timer1 == 0) {
-            func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+            DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
             this->actionFlags &= ~2;
         }
     } else if (this->timer1 != 0) {
-        func_8003EC50(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_EnableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
         this->actionFlags |= 2;
     }
 }
@@ -68,7 +68,7 @@ void BgGndDarkmeiro_Init(Actor* thisx, PlayState* play2) {
                 thisx->draw = BgGndDarkmeiro_DrawSwitchBlock;
                 this->updateFunc = BgGndDarkmeiro_UpdateSwitchBlock;
                 if (!Flags_GetSwitch(play, (this->dyna.actor.params >> 8) & 0x3F)) {
-                    func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+                    DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
                 } else {
                     this->timer1 = 64;
                     this->actionFlags |= 2;
diff --git a/src/overlays/actors/ovl_Bg_Gnd_Firemeiro/z_bg_gnd_firemeiro.c b/src/overlays/actors/ovl_Bg_Gnd_Firemeiro/z_bg_gnd_firemeiro.c
index b60f4958a4..b2530a3ec4 100644
--- a/src/overlays/actors/ovl_Bg_Gnd_Firemeiro/z_bg_gnd_firemeiro.c
+++ b/src/overlays/actors/ovl_Bg_Gnd_Firemeiro/z_bg_gnd_firemeiro.c
@@ -60,7 +60,7 @@ void BgGndFiremeiro_Destroy(Actor* thisx, PlayState* play2) {
 void BgGndFiremeiro_Sink(BgGndFiremeiro* this, PlayState* play) {
     f32 sunkHeight = this->initPos.y - 150.0f;
 
-    if (func_8004356C(&this->dyna)) {
+    if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
         this->timer = 10;
     }
 
@@ -85,7 +85,7 @@ void BgGndFiremeiro_Shake(BgGndFiremeiro* this, PlayState* play) {
     s32 pad;
     f32 randSign;
 
-    if (func_8004356C(&this->dyna)) { // Player standing on it
+    if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
         if (this->timer > 0) {
             this->timer--;
 
@@ -114,7 +114,7 @@ void BgGndFiremeiro_Rise(BgGndFiremeiro* this, PlayState* play) {
     Player* player = GET_PLAYER(play);
     Actor* thisx = &this->dyna.actor;
 
-    if ((player->currentBoots != PLAYER_BOOTS_HOVER) && func_8004356C(&this->dyna)) { // Player standing on it
+    if ((player->currentBoots != PLAYER_BOOTS_HOVER) && DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
         if (thisx->world.pos.y < this->initPos.y) {
             this->actionFunc = BgGndFiremeiro_Sink;
             this->timer = 20;
diff --git a/src/overlays/actors/ovl_Bg_Haka_Gate/z_bg_haka_gate.c b/src/overlays/actors/ovl_Bg_Haka_Gate/z_bg_haka_gate.c
index c0d19f28bf..d390f5f3b2 100644
--- a/src/overlays/actors/ovl_Bg_Haka_Gate/z_bg_haka_gate.c
+++ b/src/overlays/actors/ovl_Bg_Haka_Gate/z_bg_haka_gate.c
@@ -242,7 +242,7 @@ void BgHakaGate_FloorClosed(BgHakaGate* this, PlayState* play) {
             } else {
                 func_80078884(NA_SE_SY_ERROR);
                 Audio_PlayActorSound2(&this->dyna.actor, NA_SE_EV_GROUND_GATE_OPEN);
-                func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+                DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
                 this->vTimer = 60;
                 this->actionFunc = BgHakaGate_FloorOpen;
             }
@@ -256,7 +256,7 @@ void BgHakaGate_FloorOpen(BgHakaGate* this, PlayState* play) {
     }
     if (this->vTimer == 0) {
         if (Math_ScaledStepToS(&this->vOpenAngle, 0, 0x800)) {
-            func_8003EC50(play, &play->colCtx.dyna, this->dyna.bgId);
+            DynaPoly_EnableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
             this->actionFunc = BgHakaGate_FloorClosed;
         }
     } else {
diff --git a/src/overlays/actors/ovl_Bg_Haka_Megane/z_bg_haka_megane.c b/src/overlays/actors/ovl_Bg_Haka_Megane/z_bg_haka_megane.c
index e3230b5aed..d3154f7459 100644
--- a/src/overlays/actors/ovl_Bg_Haka_Megane/z_bg_haka_megane.c
+++ b/src/overlays/actors/ovl_Bg_Haka_Megane/z_bg_haka_megane.c
@@ -110,10 +110,10 @@ void func_8087DBF0(BgHakaMegane* this, PlayState* play) {
 
     if (play->actorCtx.lensActive) {
         thisx->flags |= ACTOR_FLAG_7;
-        func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
     } else {
         thisx->flags &= ~ACTOR_FLAG_7;
-        func_8003EC50(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_EnableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
     }
 }
 
diff --git a/src/overlays/actors/ovl_Bg_Haka_Ship/z_bg_haka_ship.c b/src/overlays/actors/ovl_Bg_Haka_Ship/z_bg_haka_ship.c
index 644be1d0b7..6df4947f3b 100644
--- a/src/overlays/actors/ovl_Bg_Haka_Ship/z_bg_haka_ship.c
+++ b/src/overlays/actors/ovl_Bg_Haka_Ship/z_bg_haka_ship.c
@@ -178,7 +178,8 @@ void BgHakaShip_CrashFall(BgHakaShip* this, PlayState* play) {
         }
     } else {
         Audio_PlayActorSound2(&this->dyna.actor, NA_SE_EV_BLOCKSINK - SFX_FLAG);
-        if ((this->dyna.actor.home.pos.y - this->dyna.actor.world.pos.y > 500.0f) && func_8004356C(&this->dyna)) {
+        if ((this->dyna.actor.home.pos.y - this->dyna.actor.world.pos.y > 500.0f) &&
+            DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
             Play_TriggerVoidOut(play);
         }
     }
diff --git a/src/overlays/actors/ovl_Bg_Hidan_Fslift/z_bg_hidan_fslift.c b/src/overlays/actors/ovl_Bg_Hidan_Fslift/z_bg_hidan_fslift.c
index c68fe952c1..c3ff87e241 100644
--- a/src/overlays/actors/ovl_Bg_Hidan_Fslift/z_bg_hidan_fslift.c
+++ b/src/overlays/actors/ovl_Bg_Hidan_Fslift/z_bg_hidan_fslift.c
@@ -89,7 +89,7 @@ void func_80886FCC(BgHidanFslift* this, PlayState* play) {
         if ((this->dyna.actor.world.pos.y - this->dyna.actor.home.pos.y) < 0.5f) {
             heightBool = true;
         }
-        if (func_80043590(&this->dyna) && heightBool) {
+        if (DynaPolyActor_IsPlayerAbove(&this->dyna) && heightBool) {
             this->actionFunc = func_808870D8;
         } else if (!heightBool) {
             this->actionFunc = func_8088706C;
@@ -108,7 +108,7 @@ void func_8088706C(BgHidanFslift* this, PlayState* play) {
 }
 
 void func_808870D8(BgHidanFslift* this, PlayState* play) {
-    if (func_80043590(&this->dyna)) {
+    if (DynaPolyActor_IsPlayerAbove(&this->dyna)) {
         if (Math_StepToF(&this->dyna.actor.world.pos.y, this->dyna.actor.home.pos.y + 790.0f, 4.0f)) {
             Audio_PlayActorSound2(&this->dyna.actor, NA_SE_EV_BLOCK_BOUND);
             func_80886FB4(this);
@@ -125,12 +125,12 @@ void BgHidanFslift_Update(Actor* thisx, PlayState* play) {
     BgHidanFslift* this = (BgHidanFslift*)thisx;
 
     this->actionFunc(this, play);
-    if (func_8004356C(&this->dyna)) {
+    if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
         if (this->unk_16A == 0) {
             this->unk_16A = 3;
         }
         Camera_ChangeSetting(play->cameraPtrs[CAM_ID_MAIN], CAM_SET_FIRE_PLATFORM);
-    } else if (!func_8004356C(&this->dyna)) {
+    } else if (!DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
         if (this->unk_16A != 0) {
             Camera_ChangeSetting(play->cameraPtrs[CAM_ID_MAIN], CAM_SET_DUNGEON0);
         }
diff --git a/src/overlays/actors/ovl_Bg_Hidan_Hrock/z_bg_hidan_hrock.c b/src/overlays/actors/ovl_Bg_Hidan_Hrock/z_bg_hidan_hrock.c
index 87952bba82..693362ca76 100644
--- a/src/overlays/actors/ovl_Bg_Hidan_Hrock/z_bg_hidan_hrock.c
+++ b/src/overlays/actors/ovl_Bg_Hidan_Hrock/z_bg_hidan_hrock.c
@@ -215,7 +215,7 @@ void func_808896B8(BgHidanHrock* this, PlayState* play) {
         CollisionCheck_SetAC(play, &play->colChkCtx, &this->collider.base);
     }
 
-    if (func_8004356C(&this->dyna)) {
+    if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
         Math_StepToF(&this->dyna.actor.world.pos.y, this->dyna.actor.home.pos.y - 5.0f, 1.0f);
     } else {
         Math_StepToF(&this->dyna.actor.world.pos.y, this->dyna.actor.home.pos.y, 1.0f);
diff --git a/src/overlays/actors/ovl_Bg_Hidan_Rock/z_bg_hidan_rock.c b/src/overlays/actors/ovl_Bg_Hidan_Rock/z_bg_hidan_rock.c
index 7ad3107691..d2d218a43d 100644
--- a/src/overlays/actors/ovl_Bg_Hidan_Rock/z_bg_hidan_rock.c
+++ b/src/overlays/actors/ovl_Bg_Hidan_Rock/z_bg_hidan_rock.c
@@ -209,7 +209,7 @@ void func_8088B5F4(BgHidanRock* this, PlayState* play) {
 }
 
 void func_8088B634(BgHidanRock* this, PlayState* play) {
-    if (func_8004356C(&this->dyna)) {
+    if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
         this->timer = 20;
         this->dyna.actor.world.rot.y = Camera_GetCamDirYaw(GET_ACTIVE_CAM(play)) + 0x4000;
         this->actionFunc = func_8088B69C;
@@ -260,12 +260,12 @@ void func_8088B79C(BgHidanRock* this, PlayState* play) {
     this->unk_16C = CLAMP_MIN(this->unk_16C, 0.0f);
 
     if (this->type == 0) {
-        if (func_8004356C(&this->dyna)) {
+        if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
             if (this->unk_169 == 0) {
                 this->unk_169 = 3;
             }
             Camera_ChangeSetting(play->cameraPtrs[CAM_ID_MAIN], CAM_SET_FIRE_PLATFORM);
-        } else if (!func_8004356C(&this->dyna)) {
+        } else if (!DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
             if (this->unk_169 != 0) {
                 Camera_ChangeSetting(play->cameraPtrs[CAM_ID_MAIN], CAM_SET_DUNGEON0);
             }
@@ -313,12 +313,12 @@ void func_8088B990(BgHidanRock* this, PlayState* play) {
 
     this->unk_16C = (this->dyna.actor.world.pos.y + 50.0f - this->dyna.actor.home.pos.y + 40.0f) / 80.0f;
     if (this->type == 0) {
-        if (func_8004356C(&this->dyna)) {
+        if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
             if (this->unk_169 == 0) {
                 this->unk_169 = 3;
             }
             Camera_ChangeSetting(play->cameraPtrs[CAM_ID_MAIN], CAM_SET_FIRE_PLATFORM);
-        } else if (!func_8004356C(&this->dyna)) {
+        } else if (!DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
             if (this->unk_169 != 0) {
                 Camera_ChangeSetting(play->cameraPtrs[CAM_ID_MAIN], CAM_SET_DUNGEON0);
             }
diff --git a/src/overlays/actors/ovl_Bg_Hidan_Sima/z_bg_hidan_sima.c b/src/overlays/actors/ovl_Bg_Hidan_Sima/z_bg_hidan_sima.c
index 82355a4e3b..023385e0b9 100644
--- a/src/overlays/actors/ovl_Bg_Hidan_Sima/z_bg_hidan_sima.c
+++ b/src/overlays/actors/ovl_Bg_Hidan_Sima/z_bg_hidan_sima.c
@@ -117,7 +117,7 @@ void func_8088E518(BgHidanSima* this, PlayState* play) {
     Player* player = GET_PLAYER(play);
 
     Math_StepToF(&this->dyna.actor.world.pos.y, this->dyna.actor.home.pos.y, 3.4f);
-    if (func_8004356C(&this->dyna) && !(player->stateFlags1 & (PLAYER_STATE1_13 | PLAYER_STATE1_14))) {
+    if (DynaPolyActor_IsPlayerOnTop(&this->dyna) && !(player->stateFlags1 & (PLAYER_STATE1_13 | PLAYER_STATE1_14))) {
         this->timer = 20;
         this->dyna.actor.world.rot.y = Camera_GetCamDirYaw(GET_ACTIVE_CAM(play)) + 0x4000;
         if (this->dyna.actor.home.pos.y <= this->dyna.actor.world.pos.y) {
@@ -149,7 +149,7 @@ void func_8088E5D0(BgHidanSima* this, PlayState* play) {
 }
 
 void func_8088E6D0(BgHidanSima* this, PlayState* play) {
-    if (func_8004356C(&this->dyna)) {
+    if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
         this->timer = 20;
     } else if (this->timer != 0) {
         this->timer--;
diff --git a/src/overlays/actors/ovl_Bg_Hidan_Syoku/z_bg_hidan_syoku.c b/src/overlays/actors/ovl_Bg_Hidan_Syoku/z_bg_hidan_syoku.c
index 5f59183fd0..a8d48f1640 100644
--- a/src/overlays/actors/ovl_Bg_Hidan_Syoku/z_bg_hidan_syoku.c
+++ b/src/overlays/actors/ovl_Bg_Hidan_Syoku/z_bg_hidan_syoku.c
@@ -60,7 +60,7 @@ void func_8088F47C(BgHidanSyoku* this) {
 }
 
 void func_8088F4B8(BgHidanSyoku* this, PlayState* play) {
-    if (Flags_GetClear(play, this->dyna.actor.room) && func_8004356C(&this->dyna)) {
+    if (Flags_GetClear(play, this->dyna.actor.room) && DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
         this->timer = 140;
         this->actionFunc = func_8088F514;
     }
@@ -108,12 +108,12 @@ void BgHidanSyoku_Update(Actor* thisx, PlayState* play) {
     BgHidanSyoku* this = (BgHidanSyoku*)thisx;
 
     this->actionFunc(this, play);
-    if (func_8004356C(&this->dyna)) {
+    if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
         if (this->unk_168 == 0) {
             this->unk_168 = 3;
         }
         Camera_ChangeSetting(play->cameraPtrs[CAM_ID_MAIN], CAM_SET_FIRE_PLATFORM);
-    } else if (!func_8004356C(&this->dyna)) {
+    } else if (!DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
         if (this->unk_168 != 0) {
             Camera_ChangeSetting(play->cameraPtrs[CAM_ID_MAIN], CAM_SET_DUNGEON0);
         }
diff --git a/src/overlays/actors/ovl_Bg_Ice_Turara/z_bg_ice_turara.c b/src/overlays/actors/ovl_Bg_Ice_Turara/z_bg_ice_turara.c
index 0854e2dfc1..b21f0b0dd2 100644
--- a/src/overlays/actors/ovl_Bg_Ice_Turara/z_bg_ice_turara.c
+++ b/src/overlays/actors/ovl_Bg_Ice_Turara/z_bg_ice_turara.c
@@ -144,7 +144,7 @@ void BgIceTurara_Shiver(BgIceTurara* this, PlayState* play) {
         this->dyna.actor.world.pos.z = this->dyna.actor.home.pos.z;
         Collider_UpdateCylinder(&this->dyna.actor, &this->collider);
         CollisionCheck_SetAT(play, &play->colChkCtx, &this->collider.base);
-        func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
         this->actionFunc = BgIceTurara_Fall;
     } else {
         sp28 = Rand_ZeroOne();
@@ -166,7 +166,7 @@ void BgIceTurara_Fall(BgIceTurara* this, PlayState* play) {
         BgIceTurara_Break(this, play, 40.0f);
         if (this->dyna.actor.params == TURARA_STALACTITE_REGROW) {
             this->dyna.actor.world.pos.y = this->dyna.actor.home.pos.y + 120.0f;
-            func_8003EC50(play, &play->colCtx.dyna, this->dyna.bgId);
+            DynaPoly_EnableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
             this->actionFunc = BgIceTurara_Regrow;
         } else {
             Actor_Kill(&this->dyna.actor);
diff --git a/src/overlays/actors/ovl_Bg_Jya_1flift/z_bg_jya_1flift.c b/src/overlays/actors/ovl_Bg_Jya_1flift/z_bg_jya_1flift.c
index 5cf654a565..cae20779c5 100644
--- a/src/overlays/actors/ovl_Bg_Jya_1flift/z_bg_jya_1flift.c
+++ b/src/overlays/actors/ovl_Bg_Jya_1flift/z_bg_jya_1flift.c
@@ -186,7 +186,7 @@ void BgJya1flift_Update(Actor* thisx, PlayState* play2) {
     // Room 0 is the first room and 6 is the room that the lift starts on
     if (play->roomCtx.curRoom.num == 6 || play->roomCtx.curRoom.num == 0) {
         this->actionFunc(this, play);
-        tempIsRiding = func_8004356C(&this->dyna) ? true : false;
+        tempIsRiding = DynaPolyActor_IsPlayerOnTop(&this->dyna) ? true : false;
         if ((this->actionFunc == BgJya1flift_Move) || (this->actionFunc == BgJya1flift_DelayMove)) {
             if (tempIsRiding) {
                 Camera_ChangeSetting(play->cameraPtrs[CAM_ID_MAIN], CAM_SET_FIRE_PLATFORM);
diff --git a/src/overlays/actors/ovl_Bg_Jya_Lift/z_bg_jya_lift.c b/src/overlays/actors/ovl_Bg_Jya_Lift/z_bg_jya_lift.c
index e6e1c2b038..73c46dcdd2 100644
--- a/src/overlays/actors/ovl_Bg_Jya_Lift/z_bg_jya_lift.c
+++ b/src/overlays/actors/ovl_Bg_Jya_Lift/z_bg_jya_lift.c
@@ -135,13 +135,14 @@ void BgJyaLift_Update(Actor* thisx, PlayState* play2) {
     if (this->actionFunc != NULL) {
         this->actionFunc(this, play);
     }
-    if ((this->dyna.unk_160 & 4) && ((this->unk_16B & 4) == 0)) {
+    if ((this->dyna.interactFlags & DYNA_INTERACT_PLAYER_ABOVE) && !(this->unk_16B & DYNA_INTERACT_PLAYER_ABOVE)) {
         Camera_ChangeSetting(play->cameraPtrs[CAM_ID_MAIN], CAM_SET_DIRECTED_YAW);
-    } else if (((this->dyna.unk_160 & 4) == 0) && (this->unk_16B & 4) &&
+    } else if (!(this->dyna.interactFlags & DYNA_INTERACT_PLAYER_ABOVE) &&
+               (this->unk_16B & DYNA_INTERACT_PLAYER_ABOVE) &&
                (play->cameraPtrs[CAM_ID_MAIN]->setting == CAM_SET_DIRECTED_YAW)) {
         Camera_ChangeSetting(play->cameraPtrs[CAM_ID_MAIN], CAM_SET_DUNGEON0);
     }
-    this->unk_16B = this->dyna.unk_160;
+    this->unk_16B = this->dyna.interactFlags;
 
     // Spirit Temple room 5 is the main room with the statue room 25 is directly above room 5
     if ((play->roomCtx.curRoom.num != 5) && (play->roomCtx.curRoom.num != 25)) {
diff --git a/src/overlays/actors/ovl_Bg_Menkuri_Kaiten/z_bg_menkuri_kaiten.c b/src/overlays/actors/ovl_Bg_Menkuri_Kaiten/z_bg_menkuri_kaiten.c
index 9eac1418fb..eb4fe0f171 100644
--- a/src/overlays/actors/ovl_Bg_Menkuri_Kaiten/z_bg_menkuri_kaiten.c
+++ b/src/overlays/actors/ovl_Bg_Menkuri_Kaiten/z_bg_menkuri_kaiten.c
@@ -50,7 +50,7 @@ void BgMenkuriKaiten_Destroy(Actor* thisx, PlayState* play) {
 void BgMenkuriKaiten_Update(Actor* thisx, PlayState* play) {
     BgMenkuriKaiten* this = (BgMenkuriKaiten*)thisx;
 
-    if (!Flags_GetSwitch(play, this->dyna.actor.params) && func_80043590(&this->dyna)) {
+    if (!Flags_GetSwitch(play, this->dyna.actor.params) && DynaPolyActor_IsPlayerAbove(&this->dyna)) {
         func_8002F974(&this->dyna.actor, NA_SE_EV_ELEVATOR_MOVE - SFX_FLAG);
         this->dyna.actor.shape.rot.y += 0x80;
     }
diff --git a/src/overlays/actors/ovl_Bg_Mizu_Bwall/z_bg_mizu_bwall.c b/src/overlays/actors/ovl_Bg_Mizu_Bwall/z_bg_mizu_bwall.c
index 27aa6da11e..75e9167b40 100644
--- a/src/overlays/actors/ovl_Bg_Mizu_Bwall/z_bg_mizu_bwall.c
+++ b/src/overlays/actors/ovl_Bg_Mizu_Bwall/z_bg_mizu_bwall.c
@@ -184,7 +184,7 @@ void BgMizuBwall_Init(Actor* thisx, PlayState* play) {
     switch ((u16)this->dyna.actor.params & 0xF) {
         case MIZUBWALL_FLOOR:
             if (Flags_GetSwitch(play, ((u16)this->dyna.actor.params >> 8) & 0x3F)) {
-                func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+                DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
                 this->dList = NULL;
                 this->actionFunc = BgMizuBwall_DoNothing;
             } else {
@@ -219,7 +219,7 @@ void BgMizuBwall_Init(Actor* thisx, PlayState* play) {
             break;
         case MIZUBWALL_RUTO_ROOM:
             if (Flags_GetSwitch(play, ((u16)this->dyna.actor.params >> 8) & 0x3F)) {
-                func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+                DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
                 this->dList = NULL;
                 this->actionFunc = BgMizuBwall_DoNothing;
             } else {
@@ -254,7 +254,7 @@ void BgMizuBwall_Init(Actor* thisx, PlayState* play) {
             break;
         case MIZUBWALL_UNUSED:
             if (Flags_GetSwitch(play, ((u16)this->dyna.actor.params >> 8) & 0x3F)) {
-                func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+                DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
                 this->dList = NULL;
                 this->actionFunc = BgMizuBwall_DoNothing;
             } else {
@@ -291,7 +291,7 @@ void BgMizuBwall_Init(Actor* thisx, PlayState* play) {
             break;
         case MIZUBWALL_STINGER_ROOM_1:
             if (Flags_GetSwitch(play, ((u16)this->dyna.actor.params >> 8) & 0x3F)) {
-                func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+                DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
                 this->dList = NULL;
                 this->actionFunc = BgMizuBwall_DoNothing;
             } else {
@@ -329,7 +329,7 @@ void BgMizuBwall_Init(Actor* thisx, PlayState* play) {
             break;
         case MIZUBWALL_STINGER_ROOM_2:
             if (Flags_GetSwitch(play, ((u16)this->dyna.actor.params >> 8) & 0x3F)) {
-                func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+                DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
                 this->dList = NULL;
                 this->actionFunc = BgMizuBwall_DoNothing;
             } else {
@@ -467,7 +467,7 @@ void BgMizuBwall_Idle(BgMizuBwall* this, PlayState* play) {
         this->collider.base.acFlags &= ~AC_HIT;
         Flags_SetSwitch(play, ((u16)this->dyna.actor.params >> 8) & 0x3F);
         this->breakTimer = 1;
-        func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
         this->dList = NULL;
         BgMizuBwall_SpawnDebris(this, play);
         Audio_PlayActorSound2(&this->dyna.actor, NA_SE_EV_WALL_BROKEN);
diff --git a/src/overlays/actors/ovl_Bg_Mizu_Uzu/z_bg_mizu_uzu.c b/src/overlays/actors/ovl_Bg_Mizu_Uzu/z_bg_mizu_uzu.c
index 92349ca1cc..ccfd9ed875 100644
--- a/src/overlays/actors/ovl_Bg_Mizu_Uzu/z_bg_mizu_uzu.c
+++ b/src/overlays/actors/ovl_Bg_Mizu_Uzu/z_bg_mizu_uzu.c
@@ -57,9 +57,9 @@ void func_8089F788(BgMizuUzu* this, PlayState* play) {
     Actor* thisx = &this->dyna.actor;
 
     if (GET_PLAYER(play)->currentBoots == PLAYER_BOOTS_IRON) {
-        func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
     } else {
-        func_8003EC50(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_EnableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
     }
     Audio_PlayActorSound2(thisx, NA_SE_EV_WATER_CONVECTION - SFX_FLAG);
     thisx->shape.rot.y += 0x1C0;
diff --git a/src/overlays/actors/ovl_Bg_Mori_Bigst/z_bg_mori_bigst.c b/src/overlays/actors/ovl_Bg_Mori_Bigst/z_bg_mori_bigst.c
index e5d5e323c2..4873c2c9e1 100644
--- a/src/overlays/actors/ovl_Bg_Mori_Bigst/z_bg_mori_bigst.c
+++ b/src/overlays/actors/ovl_Bg_Mori_Bigst/z_bg_mori_bigst.c
@@ -231,7 +231,7 @@ void BgMoriBigst_Update(Actor* thisx, PlayState* play) {
     if (this->waitTimer > 0) {
         this->waitTimer--;
     }
-    if (func_80043590(&this->dyna)) {
+    if (DynaPolyActor_IsPlayerAbove(&this->dyna)) {
         Environment_ChangeLightSetting(play, 6);
     }
     if (this->actionFunc != NULL) {
diff --git a/src/overlays/actors/ovl_Bg_Mori_Elevator/z_bg_mori_elevator.c b/src/overlays/actors/ovl_Bg_Mori_Elevator/z_bg_mori_elevator.c
index eb45301314..206e7a89e6 100644
--- a/src/overlays/actors/ovl_Bg_Mori_Elevator/z_bg_mori_elevator.c
+++ b/src/overlays/actors/ovl_Bg_Mori_Elevator/z_bg_mori_elevator.c
@@ -124,7 +124,8 @@ void BgMoriElevator_Destroy(Actor* thisx, PlayState* play) {
 }
 
 s32 BgMoriElevator_IsPlayerRiding(BgMoriElevator* this, PlayState* play) {
-    return ((this->dyna.unk_160 & 2) && !(this->unk_170 & 2) &&
+    return ((this->dyna.interactFlags & DYNA_INTERACT_PLAYER_ON_TOP) &&
+            !(this->unk_170 & DYNA_INTERACT_PLAYER_ON_TOP) &&
             ((GET_PLAYER(play)->actor.world.pos.y - this->dyna.actor.world.pos.y) < 80.0f));
 }
 
@@ -243,7 +244,7 @@ void BgMoriElevator_Update(Actor* thisx, PlayState* play) {
     BgMoriElevator* this = (BgMoriElevator*)thisx;
 
     this->actionFunc(this, play);
-    this->unk_170 = this->dyna.unk_160;
+    this->unk_170 = this->dyna.interactFlags;
     this->unk_16C = Flags_GetSwitch(play, (thisx->params & 0x3F));
 }
 
diff --git a/src/overlays/actors/ovl_Bg_Spot03_Taki/z_bg_spot03_taki.c b/src/overlays/actors/ovl_Bg_Spot03_Taki/z_bg_spot03_taki.c
index 74377c1973..a2c1540694 100644
--- a/src/overlays/actors/ovl_Bg_Spot03_Taki/z_bg_spot03_taki.c
+++ b/src/overlays/actors/ovl_Bg_Spot03_Taki/z_bg_spot03_taki.c
@@ -81,7 +81,7 @@ void func_808ADEF0(BgSpot03Taki* this, PlayState* play) {
         if (this->openingAlpha > 0) {
             this->openingAlpha -= 5;
             if (this->openingAlpha <= 0.0f) {
-                func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+                DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
                 this->timer = 400;
                 this->state = WATERFALL_OPENED;
                 this->openingAlpha = 0;
@@ -96,7 +96,7 @@ void func_808ADEF0(BgSpot03Taki* this, PlayState* play) {
         if (this->openingAlpha < 255.0f) {
             this->openingAlpha += 5.0f;
             if (this->openingAlpha >= 255.0f) {
-                func_8003EC50(play, &play->colCtx.dyna, this->dyna.bgId);
+                DynaPoly_EnableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
                 this->state = WATERFALL_CLOSED;
                 this->openingAlpha = 255.0f;
                 Flags_UnsetSwitch(play, this->switchFlag);
diff --git a/src/overlays/actors/ovl_Bg_Spot08_Iceblock/z_bg_spot08_iceblock.c b/src/overlays/actors/ovl_Bg_Spot08_Iceblock/z_bg_spot08_iceblock.c
index 10e28eff2b..79d46f9956 100644
--- a/src/overlays/actors/ovl_Bg_Spot08_Iceblock/z_bg_spot08_iceblock.c
+++ b/src/overlays/actors/ovl_Bg_Spot08_Iceblock/z_bg_spot08_iceblock.c
@@ -98,8 +98,8 @@ void BgSpot08Iceblock_SinkUnderPlayer(BgSpot08Iceblock* this) {
             break;
     }
 
-    // Sink under Player's weight if standing on it
-    target = (func_80043548(&this->dyna) ? -4.0f : 0.0f);
+    // Sink under an actor's weight if standing on it
+    target = (DynaPolyActor_IsActorOnTop(&this->dyna) ? -4.0f : 0.0f);
 
     Math_StepToF(&this->sinkOffset, target, step);
 }
@@ -198,7 +198,7 @@ void BgSpot08Iceblock_Roll(BgSpot08Iceblock* this, PlayState* play) {
     surfaceNormalHorizontal.z = this->surfaceNormal.z;
 
     // If player is standing on it or holding the edge
-    if (func_8004356C(&this->dyna) && (playerCentroidDist > 3.0f)) {
+    if (DynaPolyActor_IsPlayerOnTop(&this->dyna) && (playerCentroidDist > 3.0f)) {
         Math_Vec3f_Diff(&playerCentroidDiff, &surfaceNormalHorizontal, &playerMoment);
         BgSpot08Iceblock_MultVectorScalar(&playerMoment, &playerMoment,
                                           (sInertias[rollDataIndex] * playerCentroidDist) / this->dyna.actor.scale.x);
diff --git a/src/overlays/actors/ovl_Bg_Spot18_Basket/z_bg_spot18_basket.c b/src/overlays/actors/ovl_Bg_Spot18_Basket/z_bg_spot18_basket.c
index 1e81a2d013..ad0595cf5f 100644
--- a/src/overlays/actors/ovl_Bg_Spot18_Basket/z_bg_spot18_basket.c
+++ b/src/overlays/actors/ovl_Bg_Spot18_Basket/z_bg_spot18_basket.c
@@ -225,7 +225,7 @@ void func_808B7BCC(BgSpot18Basket* this, PlayState* play) {
                                     this->dyna.actor.world.pos.z, this->dyna.actor.world.pos.x) < SQ(32.0f)) {
                     OnePointCutscene_Init(play, 4210, 240, &this->dyna.actor, CAM_ID_MAIN);
                     func_808B7D38(this);
-                    func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+                    DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
                 }
             }
         }
@@ -333,7 +333,7 @@ void func_808B7FC0(BgSpot18Basket* this, PlayState* play) {
             this->dyna.actor.shape.rot.y = arrayValue;
 
             func_808B818C(this);
-            func_8003EC50(play, &play->colCtx.dyna, this->dyna.bgId);
+            DynaPoly_EnableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
         }
     }
 
diff --git a/src/overlays/actors/ovl_Bg_Sst_Floor/z_bg_sst_floor.c b/src/overlays/actors/ovl_Bg_Sst_Floor/z_bg_sst_floor.c
index d62916c159..818051fdce 100644
--- a/src/overlays/actors/ovl_Bg_Sst_Floor/z_bg_sst_floor.c
+++ b/src/overlays/actors/ovl_Bg_Sst_Floor/z_bg_sst_floor.c
@@ -60,13 +60,13 @@ void BgSstFloor_Update(Actor* thisx, PlayState* play) {
 
     if (1) {}
 
-    if (func_80043590(&this->dyna) && (this->dyna.actor.yDistToPlayer < 1000.0f)) {
+    if (DynaPolyActor_IsPlayerAbove(&this->dyna) && (this->dyna.actor.yDistToPlayer < 1000.0f)) {
         Camera_ChangeSetting(play->cameraPtrs[CAM_ID_MAIN], CAM_SET_BOSS_BONGO);
     } else {
         Camera_ChangeSetting(play->cameraPtrs[CAM_ID_MAIN], CAM_SET_DUNGEON0);
     }
 
-    if (func_8004356C(&this->dyna) && (player->fallDistance > 1000.0f)) {
+    if (DynaPolyActor_IsPlayerOnTop(&this->dyna) && (player->fallDistance > 1000.0f)) {
         this->dyna.actor.params = 1;
         Audio_PlayActorSound2(&this->dyna.actor, NA_SE_EN_SHADEST_TAIKO_HIGH);
     }
@@ -80,7 +80,8 @@ void BgSstFloor_Update(Actor* thisx, PlayState* play) {
         this->dyna.actor.params = BONGOFLOOR_REST;
         this->drumPhase = 28;
 
-        if (func_8004356C(&this->dyna) && !(player->stateFlags1 & (PLAYER_STATE1_13 | PLAYER_STATE1_14))) {
+        if (DynaPolyActor_IsPlayerOnTop(&this->dyna) &&
+            !(player->stateFlags1 & (PLAYER_STATE1_13 | PLAYER_STATE1_14))) {
             distFromRim = 600.0f - this->dyna.actor.xzDistToPlayer;
             if (distFromRim > 0.0f) {
                 if (distFromRim > 350.0f) {
@@ -117,7 +118,7 @@ void BgSstFloor_Update(Actor* thisx, PlayState* play) {
         this->drumPhase--;
     }
     if (1) {}
-    func_8003EE6C(play, &play->colCtx.dyna);
+    DynaPoly_InvalidateLookup(play, &play->colCtx.dyna);
 }
 
 void BgSstFloor_Draw(Actor* thisx, PlayState* play) {
diff --git a/src/overlays/actors/ovl_Bg_Ydan_Sp/z_bg_ydan_sp.c b/src/overlays/actors/ovl_Bg_Ydan_Sp/z_bg_ydan_sp.c
index e347f28802..97f95a1c07 100644
--- a/src/overlays/actors/ovl_Bg_Ydan_Sp/z_bg_ydan_sp.c
+++ b/src/overlays/actors/ovl_Bg_Ydan_Sp/z_bg_ydan_sp.c
@@ -250,7 +250,7 @@ void BgYdanSp_FloorWebBreaking(BgYdanSp* this, PlayState* play) {
 
     this->dyna.actor.world.pos.y = (sinf((f32)this->timer * (M_PI / 20)) * this->unk_16C) + this->dyna.actor.home.pos.y;
     if (this->dyna.actor.home.pos.y - this->dyna.actor.world.pos.y > 190.0f) {
-        func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
         this->timer = 40;
         func_80078884(NA_SE_SY_CORRECT_CHIME);
         Flags_SetSwitch(play, this->isDestroyedSwitchFlag);
@@ -288,7 +288,7 @@ void BgYdanSp_FloorWebIdle(BgYdanSp* this, PlayState* play) {
         BgYdanSp_BurnWeb(this, play);
         return;
     }
-    if (func_8004356C(&this->dyna)) {
+    if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
         sqrtFallDistance = sqrtf(CLAMP_MIN(player->fallDistance, 0.0f));
         if (player->fallDistance > 750.0f) {
             if (this->dyna.actor.xzDistToPlayer < 80.0f) {
diff --git a/src/overlays/actors/ovl_Door_Toki/z_door_toki.c b/src/overlays/actors/ovl_Door_Toki/z_door_toki.c
index 9e5bbf6306..1276e01866 100644
--- a/src/overlays/actors/ovl_Door_Toki/z_door_toki.c
+++ b/src/overlays/actors/ovl_Door_Toki/z_door_toki.c
@@ -50,8 +50,8 @@ void DoorToki_Update(Actor* thisx, PlayState* play) {
     DoorToki* this = (DoorToki*)thisx;
 
     if (GET_EVENTCHKINF(EVENTCHKINF_4B)) {
-        func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
     } else {
-        func_8003EC50(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_EnableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
     }
 }
diff --git a/src/overlays/actors/ovl_En_Box/z_en_box.c b/src/overlays/actors/ovl_En_Box/z_en_box.c
index 3d584cf7d5..274bbf71da 100644
--- a/src/overlays/actors/ovl_En_Box/z_en_box.c
+++ b/src/overlays/actors/ovl_En_Box/z_en_box.c
@@ -106,7 +106,7 @@ void EnBox_Init(Actor* thisx, PlayState* play2) {
     DynaPolyActor_Init(&this->dyna, DPM_UNK);
     CollisionHeader_GetVirtual(&gTreasureChestCol, &colHeader);
     this->dyna.bgId = DynaPoly_SetBgActor(play, &play->colCtx.dyna, &this->dyna.actor, colHeader);
-    func_8003ECA8(play, &play->colCtx.dyna, this->dyna.bgId);
+    DynaPoly_DisableCeilingCollision(play, &play->colCtx.dyna, this->dyna.bgId);
 
     this->movementFlags = 0;
     this->type = thisx->params >> 12 & 0xF;
@@ -126,7 +126,7 @@ void EnBox_Init(Actor* thisx, PlayState* play2) {
         animFrameStart = endFrame;
     } else if ((this->type == ENBOX_TYPE_SWITCH_FLAG_FALL_BIG || this->type == ENBOX_TYPE_SWITCH_FLAG_FALL_SMALL) &&
                !Flags_GetSwitch(play, this->switchFlag)) {
-        func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
         if (Rand_ZeroOne() < 0.5f) {
             this->movementFlags |= ENBOX_MOVE_FALL_ANGLE_SIDE;
         }
@@ -138,7 +138,7 @@ void EnBox_Init(Actor* thisx, PlayState* play2) {
     } else if ((this->type == ENBOX_TYPE_ROOM_CLEAR_BIG || this->type == ENBOX_TYPE_ROOM_CLEAR_SMALL) &&
                !Flags_GetClear(play, this->dyna.actor.room)) {
         EnBox_SetupAction(this, EnBox_AppearOnRoomClear);
-        func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
         this->movementFlags |= ENBOX_MOVE_IMMOBILE;
         this->dyna.actor.world.pos.y = this->dyna.actor.home.pos.y - 50.0f;
         this->alpha = 0;
@@ -146,14 +146,14 @@ void EnBox_Init(Actor* thisx, PlayState* play2) {
     } else if (this->type == ENBOX_TYPE_9 || this->type == ENBOX_TYPE_10) {
         EnBox_SetupAction(this, func_809C9700);
         this->dyna.actor.flags |= ACTOR_FLAG_25;
-        func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
         this->movementFlags |= ENBOX_MOVE_IMMOBILE;
         this->dyna.actor.world.pos.y = this->dyna.actor.home.pos.y - 50.0f;
         this->alpha = 0;
         this->dyna.actor.flags |= ACTOR_FLAG_4;
     } else if (this->type == ENBOX_TYPE_SWITCH_FLAG_BIG && !Flags_GetSwitch(play, this->switchFlag)) {
         EnBox_SetupAction(this, EnBox_AppearOnSwitchFlag);
-        func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
         this->movementFlags |= ENBOX_MOVE_IMMOBILE;
         this->dyna.actor.world.pos.y = this->dyna.actor.home.pos.y - 50.0f;
         this->alpha = 0;
@@ -273,7 +273,7 @@ void EnBox_FallOnSwitchFlag(EnBox* this, PlayState* play) {
     if (this->unk_1A8 >= 0) {
         EnBox_SetupAction(this, EnBox_Fall);
         this->subCamId = OnePointCutscene_Init(play, 4500, 9999, &this->dyna.actor, CAM_ID_MAIN);
-        func_8003EC50(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_EnableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
     } else if (this->unk_1A8 >= -11) {
         this->unk_1A8++;
     } else if (Flags_GetSwitch(play, this->switchFlag)) {
@@ -367,7 +367,7 @@ void EnBox_AppearInit(EnBox* this, PlayState* play) {
 }
 
 void EnBox_AppearAnimation(EnBox* this, PlayState* play) {
-    func_8003EC50(play, &play->colCtx.dyna, this->dyna.bgId);
+    DynaPoly_EnableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
 
     if (this->unk_1A8 < 0) {
         this->unk_1A8++;
diff --git a/src/overlays/actors/ovl_En_Brob/z_en_brob.c b/src/overlays/actors/ovl_En_Brob/z_en_brob.c
index 6c257b3f9c..4ed8125175 100644
--- a/src/overlays/actors/ovl_En_Brob/z_en_brob.c
+++ b/src/overlays/actors/ovl_En_Brob/z_en_brob.c
@@ -104,7 +104,7 @@ void EnBrob_Destroy(Actor* thisx, PlayState* play) {
 }
 
 void func_809CADDC(EnBrob* this, PlayState* play) {
-    func_8003EC50(play, &play->colCtx.dyna, this->dyna.bgId);
+    DynaPoly_EnableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
     this->timer = this->actionFunc == func_809CB2B8 ? 200 : 0;
     this->unk_1AE = 0;
     this->actionFunc = func_809CB054;
@@ -112,7 +112,7 @@ void func_809CADDC(EnBrob* this, PlayState* play) {
 
 void func_809CAE44(EnBrob* this, PlayState* play) {
     Animation_PlayOnce(&this->skelAnime, &object_brob_Anim_001750);
-    func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+    DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
     this->unk_1AE = 1000;
     this->actionFunc = func_809CB114;
 }
@@ -150,7 +150,7 @@ void func_809CB054(EnBrob* this, PlayState* play) {
         this->timer--;
     }
     if (this->timer == 0) {
-        if (func_8004356C(&this->dyna) != 0) {
+        if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
             func_8002F71C(play, &this->dyna.actor, 5.0f, this->dyna.actor.yawTowardsPlayer, 1.0f);
             func_809CAE44(this, play);
         } else if (this->dyna.actor.xzDistToPlayer < 300.0f) {
diff --git a/src/overlays/actors/ovl_En_Jj/z_en_jj.c b/src/overlays/actors/ovl_En_Jj/z_en_jj.c
index bc83cfc8c3..2773a6dc02 100644
--- a/src/overlays/actors/ovl_En_Jj/z_en_jj.c
+++ b/src/overlays/actors/ovl_En_Jj/z_en_jj.c
@@ -119,7 +119,7 @@ void EnJj_Init(Actor* thisx, PlayState* play2) {
             DynaPolyActor_Init(&this->dyna, 0);
             CollisionHeader_GetVirtual(&gJabuJabuBodyCol, &colHeader);
             this->dyna.bgId = DynaPoly_SetBgActor(play, &play->colCtx.dyna, &this->dyna.actor, colHeader);
-            func_8003ECA8(play, &play->colCtx.dyna, this->dyna.bgId);
+            DynaPoly_DisableCeilingCollision(play, &play->colCtx.dyna, this->dyna.bgId);
             this->dyna.actor.update = EnJj_UpdateStaticCollision;
             this->dyna.actor.draw = NULL;
             Actor_SetScale(&this->dyna.actor, 0.087f);
@@ -182,7 +182,7 @@ void EnJj_OpenMouth(EnJj* this, PlayState* play) {
         this->mouthOpenAngle -= 102;
 
         if (this->mouthOpenAngle < -2600) {
-            func_8003EBF8(play, &play->colCtx.dyna, bodyCollisionActor->bgId);
+            DynaPoly_DisableCollision(play, &play->colCtx.dyna, bodyCollisionActor->bgId);
         }
     }
 }
@@ -217,7 +217,7 @@ void EnJj_BeginCutscene(EnJj* this, PlayState* play) {
         EnJj_SetupAction(this, EnJj_RemoveDust);
         play->csCtx.segment = &D_80A88164;
         gSaveContext.cutsceneTrigger = 1;
-        func_8003EBF8(play, &play->colCtx.dyna, bodyCollisionActor->bgId);
+        DynaPoly_DisableCollision(play, &play->colCtx.dyna, bodyCollisionActor->bgId);
         func_8005B1A4(GET_ACTIVE_CAM(play));
         SET_EVENTCHKINF(EVENTCHKINF_3A);
         func_80078884(NA_SE_SY_CORRECT_CHIME);
diff --git a/src/overlays/actors/ovl_En_Lightbox/z_en_lightbox.c b/src/overlays/actors/ovl_En_Lightbox/z_en_lightbox.c
index 77f807521a..e3624a384e 100644
--- a/src/overlays/actors/ovl_En_Lightbox/z_en_lightbox.c
+++ b/src/overlays/actors/ovl_En_Lightbox/z_en_lightbox.c
@@ -51,7 +51,7 @@ void EnLightbox_Init(Actor* thisx, PlayState* play) {
     thisx->colChkInfo.cylRadius = 30;
     thisx->colChkInfo.cylHeight = 50;
     ActorShape_Init(&thisx->shape, 0.0f, ActorShadow_DrawCircle, 6.0f);
-    this->dyna.unk_160 = 0;
+    this->dyna.interactFlags = 0;
     this->dyna.unk_15C = 0;
     thisx->targetMode = 0;
     thisx->gravity = -2.0f;
diff --git a/src/overlays/actors/ovl_En_Pu_box/z_en_pu_box.c b/src/overlays/actors/ovl_En_Pu_box/z_en_pu_box.c
index 01a2dca178..bad8e26577 100644
--- a/src/overlays/actors/ovl_En_Pu_box/z_en_pu_box.c
+++ b/src/overlays/actors/ovl_En_Pu_box/z_en_pu_box.c
@@ -51,7 +51,7 @@ void EnPubox_Init(Actor* thisx, PlayState* play) {
     thisx->uncullZoneDownward = 1200.0f;
     thisx->uncullZoneScale = 720.0f;
     ActorShape_Init(&thisx->shape, 0.0f, ActorShadow_DrawCircle, 6.0f);
-    this->dyna.unk_160 = 0;
+    this->dyna.interactFlags = 0;
     this->dyna.unk_15C = DPM_UNK;
     thisx->targetMode = 1;
     thisx->gravity = -2.0f;
diff --git a/src/overlays/actors/ovl_En_Siofuki/z_en_siofuki.c b/src/overlays/actors/ovl_En_Siofuki/z_en_siofuki.c
index aee324cfff..08f38d5d0d 100644
--- a/src/overlays/actors/ovl_En_Siofuki/z_en_siofuki.c
+++ b/src/overlays/actors/ovl_En_Siofuki/z_en_siofuki.c
@@ -127,7 +127,7 @@ void func_80AFBE8C(EnSiofuki* this, PlayState* play) {
 
     if ((dX > (this->dyna.actor.scale.x * -346.0f)) && (dX < (this->dyna.actor.scale.x * 346.0f)) &&
         (dZ > (this->dyna.actor.scale.z * -400.0f)) && (dZ < (this->dyna.actor.scale.z * 400.0f)) && (dY < 0.0f)) {
-        if (func_8004356C(&this->dyna)) {
+        if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
             if (this->splashTimer <= 0) {
                 EffectSsGSplash_Spawn(play, &player->actor.world.pos, NULL, NULL, 1, 1);
                 this->splashTimer = 10;
diff --git a/src/overlays/actors/ovl_Obj_Bean/z_obj_bean.c b/src/overlays/actors/ovl_Obj_Bean/z_obj_bean.c
index 941763d556..72920d1020 100644
--- a/src/overlays/actors/ovl_Obj_Bean/z_obj_bean.c
+++ b/src/overlays/actors/ovl_Obj_Bean/z_obj_bean.c
@@ -750,7 +750,7 @@ void ObjBean_SetupWaitForPlayer(ObjBean* this) {
 }
 
 void ObjBean_WaitForPlayer(ObjBean* this, PlayState* play) {
-    if (func_8004356C(&this->dyna)) { // Player is standing on
+    if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
         ObjBean_SetupFly(this);
         if (play->sceneNum == SCENE_SPOT10) { // Lost woods
             Camera_ChangeSetting(play->cameraPtrs[CAM_ID_MAIN], CAM_SET_BEAN_LOST_WOODS);
@@ -784,7 +784,7 @@ void ObjBean_Fly(ObjBean* this, PlayState* play) {
             Camera_ChangeSetting(mainCam, CAM_SET_NORMAL0);
         }
 
-    } else if (func_8004356C(&this->dyna) != 0) { // Player is on top
+    } else if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
 
         func_8002F974(&this->dyna.actor, NA_SE_PL_PLANT_MOVE - SFX_FLAG);
 
@@ -810,7 +810,7 @@ void ObjBean_SetupWaitForStepOff(ObjBean* this) {
 }
 
 void ObjBean_WaitForStepOff(ObjBean* this, PlayState* play) {
-    if (!func_80043590(&this->dyna)) {
+    if (!DynaPolyActor_IsPlayerAbove(&this->dyna)) {
         ObjBean_SetupWaitForPlayer(this);
     }
     ObjBean_UpdatePosition(this);
@@ -822,7 +822,7 @@ void func_80B908EC(ObjBean* this) {
 }
 
 void func_80B90918(ObjBean* this, PlayState* play) {
-    if (!func_8004356C(&this->dyna)) {
+    if (!DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
         ObjBean_SetupPathCount(this, play);
         ObjBean_SetupPath(this, play);
         ObjBean_Move(this);
@@ -856,9 +856,9 @@ void func_80B90A34(ObjBean* this, PlayState* play) {
 
     func_80B8EE24(this);
     if (trampled) {
-        func_8003EC50(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_EnableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
     } else {
-        func_8003EC50(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_EnableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
     }
     if ((this->timer <= 0) && (!trampled)) {
         func_80B8EBC8(this);
@@ -894,7 +894,7 @@ void ObjBean_Update(Actor* thisx, PlayState* play) {
             osSyncPrintf("馬と豆の木リフト衝突！！！\n");
             osSyncPrintf(VT_RST);
             ObjBean_Break(this, play);
-            func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+            DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
             func_80B908EC(this);
         }
     } else {
@@ -902,7 +902,7 @@ void ObjBean_Update(Actor* thisx, PlayState* play) {
     }
     Actor_SetFocus(&this->dyna.actor, 6.0f);
     if (this->stateFlags & BEAN_STATE_DYNAPOLY_SET) {
-        if (func_8004356C(&this->dyna)) {
+        if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
             this->stateFlags |= BEAN_STATE_PLAYER_ON_TOP;
         } else {
             this->stateFlags &= ~BEAN_STATE_PLAYER_ON_TOP;
diff --git a/src/overlays/actors/ovl_Obj_Elevator/z_obj_elevator.c b/src/overlays/actors/ovl_Obj_Elevator/z_obj_elevator.c
index 0e89e791cd..6cd7e51e05 100644
--- a/src/overlays/actors/ovl_Obj_Elevator/z_obj_elevator.c
+++ b/src/overlays/actors/ovl_Obj_Elevator/z_obj_elevator.c
@@ -85,7 +85,7 @@ void func_80B92C80(ObjElevator* this, PlayState* play) {
     f32 sub;
     Actor* thisx = &this->dyna.actor;
 
-    if ((this->dyna.unk_160 & 2) && !(this->unk_170 & 2)) {
+    if ((this->dyna.interactFlags & DYNA_INTERACT_PLAYER_ON_TOP) && !(this->unk_170 & DYNA_INTERACT_PLAYER_ON_TOP)) {
         sub = thisx->world.pos.y - thisx->home.pos.y;
         if (fabsf(sub) < 0.1f) {
             this->unk_168 = thisx->home.pos.y + ((thisx->params >> 0xC) & 0xF) * 80.0f;
@@ -117,7 +117,7 @@ void ObjElevator_Update(Actor* thisx, PlayState* play) {
     if (this->actionFunc) {
         this->actionFunc(this, play);
     }
-    this->unk_170 = this->dyna.unk_160;
+    this->unk_170 = this->dyna.interactFlags;
 }
 
 void ObjElevator_Draw(Actor* thisx, PlayState* play) {
diff --git a/src/overlays/actors/ovl_Obj_Kibako2/z_obj_kibako2.c b/src/overlays/actors/ovl_Obj_Kibako2/z_obj_kibako2.c
index 9ab64070aa..336de8d2de 100644
--- a/src/overlays/actors/ovl_Obj_Kibako2/z_obj_kibako2.c
+++ b/src/overlays/actors/ovl_Obj_Kibako2/z_obj_kibako2.c
@@ -148,7 +148,7 @@ void ObjKibako2_Idle(ObjKibako2* this, PlayState* play) {
         ObjKibako2_Break(this, play);
         SoundSource_PlaySfxAtFixedWorldPos(play, &this->dyna.actor.world.pos, 20, NA_SE_EV_WOODBOX_BREAK);
         this->dyna.actor.flags |= ACTOR_FLAG_4;
-        func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
         this->dyna.actor.draw = NULL;
         this->actionFunc = ObjKibako2_Kill;
     } else if (this->dyna.actor.xzDistToPlayer < 600.0f) {
diff --git a/src/overlays/actors/ovl_Obj_Lift/z_obj_lift.c b/src/overlays/actors/ovl_Obj_Lift/z_obj_lift.c
index 81907ea4dd..957eb1f51e 100644
--- a/src/overlays/actors/ovl_Obj_Lift/z_obj_lift.c
+++ b/src/overlays/actors/ovl_Obj_Lift/z_obj_lift.c
@@ -137,7 +137,7 @@ void func_80B96560(ObjLift* this, PlayState* play) {
     s32 pad;
     s32 quakeIndex;
 
-    if (func_8004356C(&this->dyna)) {
+    if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
         if (this->timer <= 0) {
             if (((this->dyna.actor.params >> 8) & 7) == 7) {
                 func_80B967C0(this);
diff --git a/src/overlays/actors/ovl_Obj_Oshihiki/z_obj_oshihiki.c b/src/overlays/actors/ovl_Obj_Oshihiki/z_obj_oshihiki.c
index 296acb27c7..b21dc1ed46 100644
--- a/src/overlays/actors/ovl_Obj_Oshihiki/z_obj_oshihiki.c
+++ b/src/overlays/actors/ovl_Obj_Oshihiki/z_obj_oshihiki.c
@@ -491,7 +491,7 @@ void ObjOshihiki_OnActor(ObjOshihiki* this, PlayState* play) {
         } else {
             dynaPolyActor = DynaPoly_GetActor(&play->colCtx, bgId);
             if (dynaPolyActor != NULL) {
-                func_800434A8(dynaPolyActor);
+                DynaPolyActor_SetActorOnTop(dynaPolyActor);
                 func_80043538(dynaPolyActor);
 
                 if ((this->timer <= 0) && (fabsf(this->dyna.unk_150) > 0.001f)) {
@@ -520,7 +520,7 @@ void ObjOshihiki_OnActor(ObjOshihiki* this, PlayState* play) {
             dynaPolyActor = DynaPoly_GetActor(&play->colCtx, bgId);
 
             if ((dynaPolyActor != NULL) && (dynaPolyActor->unk_15C & 1)) {
-                func_800434A8(dynaPolyActor);
+                DynaPolyActor_SetActorOnTop(dynaPolyActor);
                 func_80043538(dynaPolyActor);
                 this->dyna.actor.world.pos.y = this->dyna.actor.floorHeight;
             } else {
diff --git a/src/overlays/actors/ovl_Obj_Switch/z_obj_switch.c b/src/overlays/actors/ovl_Obj_Switch/z_obj_switch.c
index 72cbd9a800..cff2431b05 100644
--- a/src/overlays/actors/ovl_Obj_Switch/z_obj_switch.c
+++ b/src/overlays/actors/ovl_Obj_Switch/z_obj_switch.c
@@ -386,13 +386,14 @@ void ObjSwitch_FloorUp(ObjSwitch* this, PlayState* play) {
     } else {
         switch (this->dyna.actor.params >> 4 & 7) {
             case OBJSWITCH_SUBTYPE_ONCE:
-                if (func_8004356C(&this->dyna)) {
+                if (DynaPolyActor_IsPlayerOnTop(&this->dyna)) {
                     ObjSwitch_FloorPressInit(this);
                     ObjSwitch_SetOn(this, play);
                 }
                 break;
             case OBJSWITCH_SUBTYPE_TOGGLE:
-                if ((this->dyna.unk_160 & 2) && !(this->unk_17F & 2)) {
+                if ((this->dyna.interactFlags & DYNA_INTERACT_PLAYER_ON_TOP) &&
+                    !(this->unk_17F & DYNA_INTERACT_PLAYER_ON_TOP)) {
                     ObjSwitch_FloorPressInit(this);
                     ObjSwitch_SetOn(this, play);
                 }
@@ -444,7 +445,8 @@ void ObjSwitch_FloorDown(ObjSwitch* this, PlayState* play) {
             }
             break;
         case OBJSWITCH_SUBTYPE_TOGGLE:
-            if ((this->dyna.unk_160 & 2) && !(this->unk_17F & 2)) {
+            if ((this->dyna.interactFlags & DYNA_INTERACT_PLAYER_ON_TOP) &&
+                !(this->unk_17F & DYNA_INTERACT_PLAYER_ON_TOP)) {
                 ObjSwitch_FloorReleaseInit(this);
                 ObjSwitch_SetOff(this, play);
             }
@@ -691,7 +693,7 @@ void ObjSwitch_Update(Actor* thisx, PlayState* play) {
     switch (this->dyna.actor.params & 7) {
         case OBJSWITCH_TYPE_FLOOR:
         case OBJSWITCH_TYPE_FLOOR_RUSTY:
-            this->unk_17F = this->dyna.unk_160;
+            this->unk_17F = this->dyna.interactFlags;
             break;
         case OBJSWITCH_TYPE_EYE:
             this->unk_17F = this->tris.col.base.acFlags;
diff --git a/src/overlays/actors/ovl_Obj_Timeblock/z_obj_timeblock.c b/src/overlays/actors/ovl_Obj_Timeblock/z_obj_timeblock.c
index 3436cd2158..96d4bc2c3a 100644
--- a/src/overlays/actors/ovl_Obj_Timeblock/z_obj_timeblock.c
+++ b/src/overlays/actors/ovl_Obj_Timeblock/z_obj_timeblock.c
@@ -147,7 +147,7 @@ void ObjTimeblock_Destroy(Actor* thisx, PlayState* play) {
 }
 
 u8 ObjTimeblock_PlayerIsInRange(ObjTimeblock* this, PlayState* play) {
-    if (this->isVisible && func_80043590(&this->dyna)) {
+    if (this->isVisible && DynaPolyActor_IsPlayerAbove(&this->dyna)) {
         return false;
     }
 
@@ -324,9 +324,9 @@ void ObjTimeblock_Update(Actor* thisx, PlayState* play) {
     }
 
     if (this->isVisible) {
-        func_8003EC50(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_EnableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
     } else {
-        func_8003EBF8(play, &play->colCtx.dyna, this->dyna.bgId);
+        DynaPoly_DisableCollision(play, &play->colCtx.dyna, this->dyna.bgId);
     }
 }
 
diff --git a/src/overlays/actors/ovl_Obj_Warp2block/z_obj_warp2block.c b/src/overlays/actors/ovl_Obj_Warp2block/z_obj_warp2block.c
index 79a04433a9..f98a3a3fc1 100644
--- a/src/overlays/actors/ovl_Obj_Warp2block/z_obj_warp2block.c
+++ b/src/overlays/actors/ovl_Obj_Warp2block/z_obj_warp2block.c
@@ -80,7 +80,7 @@ s32 func_80BA1ECC(ObjWarp2block* this, PlayState* play) {
     Vec3f sp20;
     f32 temp_f2;
 
-    if (func_80043590(&this->dyna)) {
+    if (DynaPolyActor_IsPlayerAbove(&this->dyna)) {
         return 0;
     }
 
diff --git a/src/overlays/actors/ovl_player_actor/z_player.c b/src/overlays/actors/ovl_player_actor/z_player.c
index 4c590f083e..d95f299b69 100644
--- a/src/overlays/actors/ovl_player_actor/z_player.c
+++ b/src/overlays/actors/ovl_player_actor/z_player.c
@@ -9598,13 +9598,13 @@ s32 func_80847A78(Player* this) {
         if (!cond) {
             this->hoverBootsTimer = 19;
         }
-        return 0;
+        return false;
     }
 
     D_808535E4 = 0;
     this->unk_898 = this->unk_89A = D_80853610 = 0;
 
-    return 1;
+    return true;
 }
 
 static Vec3f D_80854798 = { 0.0f, 18.0f, 0.0f };
@@ -9694,7 +9694,7 @@ void func_80847BA0(PlayState* play, Player* this) {
                 Environment_ChangeLightSetting(
                     play, SurfaceType_GetLightSettingIndex(&play->colCtx, floorPoly, this->actor.floorBgId));
             } else {
-                func_80043508(&play->colCtx, this->actor.floorBgId);
+                DynaPoly_SetPlayerAbove(&play->colCtx, this->actor.floorBgId);
             }
         }
 
@@ -9843,7 +9843,7 @@ void func_80847BA0(PlayState* play, Player* this) {
             s32 pad3;
 
             if (this->actor.floorBgId != BGCHECK_SCENE) {
-                func_800434C8(&play->colCtx, this->actor.floorBgId);
+                DynaPoly_SetPlayerOnTop(&play->colCtx, this->actor.floorBgId);
             }
 
             floorPolyNormalX = COLPOLY_GET_NORMAL(floorPoly->normal.x);