diff --git a/include/z64.h b/include/z64.h
index 616ea24e87..fd6361f84f 100644
--- a/include/z64.h
+++ b/include/z64.h
@@ -481,8 +481,8 @@ typedef struct {
 } StaticCollisionContext; // size = 0x50
 
 typedef struct {
-    /* 0x0000 */ char   unk_00[0x04];
-    /* 0x0004 */ ActorMesh actorMeshArr[50];
+    /* 0x0000 */ ActorMesh actorMeshArr[50];
+    /* 0x1388 */ char   unk_1388[0x04];
     /* 0x138C */ u16    flags[50];
     /* 0x13F0 */ char   unk_13F0[0x24];
 } DynaCollisionContext; // size = 0x1414
diff --git a/include/z64actor.h b/include/z64actor.h
index 770ca1581d..5b5c77f56c 100644
--- a/include/z64actor.h
+++ b/include/z64actor.h
@@ -174,15 +174,17 @@ typedef struct Actor {
 } Actor; // size = 0x14C
 
 typedef struct {
-    /* 0x00 */ Actor* actor;
-    /* 0x04 */ char unk_04[0x10];
-    /* 0x14 */ Vec3f scale1;
-    /* 0x20 */ Vec3s rot1;
-    /* 0x28 */ Vec3f pos1;
-    /* 0x34 */ Vec3f scale2;
-    /* 0x40 */ Vec3s rot2;
-    /* 0x48 */ Vec3f pos2;
-    /* 0x54 */ char unk_54[0x10];
+    /* 0x00 */ char unk_00[0x04];
+    /* 0x04 */ Actor* actor;
+    /* 0x08 */ void* unk_08; // Struct800417A0*
+    /* 0x0C */ char  unk_0C[0x0C];
+    /* 0x18 */ Vec3f scale1;
+    /* 0x24 */ Vec3s rot1;
+    /* 0x2C */ Vec3f pos1;
+    /* 0x38 */ Vec3f scale2;
+    /* 0x44 */ Vec3s rot2;
+    /* 0x4C */ Vec3f pos2;
+    /* 0x58 */ char  unk_58[0x0C];
 } ActorMesh; // size = 0x64
 
 typedef struct {
diff --git a/src/code/z_bgcheck.c b/src/code/z_bgcheck.c
index 12c66c975c..f0532b86b5 100644
--- a/src/code/z_bgcheck.c
+++ b/src/code/z_bgcheck.c
@@ -298,11 +298,44 @@ void func_8003E954(u32 uParm1, u8* puParm2) {
 
 #pragma GLOBAL_ASM("asm/non_matchings/code/z_bgcheck/func_80041648.s")
 
-#pragma GLOBAL_ASM("asm/non_matchings/code/z_bgcheck/func_800417A0.s")
+typedef struct {
+    /* 0x00 */ char  unk_00[0x10];
+    /* 0x10 */ void* unk_10;
+    /* 0x14 */ char  unk_[0x04];
+    /* 0x18 */ void* unk_18;
+    /* 0x1C */ void* unk_1C;
+    /* 0x20 */ void* unk_20;
+    /* 0x24 */ char  unk_24[4];
+    /* 0x28 */ void* unk_28;
+} Struct800417A0; // size = 0x32
+
+// called by func_800418D0 with actorMesh->unk_08
+void func_800417A0(Struct800417A0* arg0) {
+    arg0->unk_10 = SEGMENTED_TO_VIRTUAL(arg0->unk_10);
+    arg0->unk_18 = SEGMENTED_TO_VIRTUAL(arg0->unk_18);
+    arg0->unk_1C = SEGMENTED_TO_VIRTUAL(arg0->unk_1C);
+    arg0->unk_20 = SEGMENTED_TO_VIRTUAL(arg0->unk_20);
+    arg0->unk_28 = SEGMENTED_TO_VIRTUAL(arg0->unk_28);
+}
 
 #pragma GLOBAL_ASM("asm/non_matchings/code/z_bgcheck/func_80041880.s")
 
-#pragma GLOBAL_ASM("asm/non_matchings/code/z_bgcheck/func_800418D0.s")
+void func_800418D0(CollisionContext* colCtx, GlobalContext* globalCtx) {
+    ActorMesh* actorMesh;
+    DynaCollisionContext* dynaColCtx;
+    s32 i;
+    u16 flag;
+
+    dynaColCtx = &colCtx->dyna;
+    for (i = 0; i < 50; i++) {
+        flag = dynaColCtx->flags[i];
+        if ((flag & 1) && !(flag & 2)) {
+            actorMesh = &dynaColCtx->actorMeshArr[i];
+            Actor_SetObjectDependency(globalCtx, actorMesh->actor);
+            func_800417A0(actorMesh->unk_08);
+        }
+    }
+}
 
 #ifdef NON_MATCHING
 void func_80041978(int iParm1, int iParm2) {