Small extension to bone:

+ attrib c="0" in the anim XML to turn off all collision for a bone
  even if collide radius or collision mask is set
+ Lua func: bone_toggleCollision() to change the above setting at runtime
+ Lua func: bone_spawnParticlesFromCollisionMask()
- Fix int truncation in entity_collideSkeletalVsLine()

Aquaria/Entity.cpp

@@ -2333,16 +2333,10 @@ void Entity::warpLastPosition()
 	position = lastPosition;
 }
 
-void Entity::spawnParticlesFromCollisionMask(const std::string &p, int intv)
+void Entity::spawnParticlesFromCollisionMask(const char *p, unsigned intv, int layer, float rotz)
 {
 	for (size_t i = 0; i < skeletalSprite.bones.size(); i++)
-	{
-		for (size_t j = 0; j < skeletalSprite.bones[i]->collisionMask.size(); j+=intv)
-		{
-			Vector pos = skeletalSprite.bones[i]->getWorldCollidePosition(skeletalSprite.bones[i]->collisionMask[j]);
-			dsq->spawnParticleEffect(p, pos);
-		}
-	}
+		skeletalSprite.bones[i]->spawnParticlesFromCollisionMask(p, intv, layer, rotz);
 }
 
 //Entity *e, Entity *attacker, Bone *bone, SpellType spell, int dmg)

Aquaria/Entity.h

@@ -76,7 +76,7 @@ public:
 	void render();
 	void update(float dt);
 
-	void spawnParticlesFromCollisionMask(const std::string &p, int intv=1);
+	void spawnParticlesFromCollisionMask(const char *p, unsigned intv=1, int layer = LR_PARTICLES, float rotz = 0);
 
 	float health;
 	float maxHealth;

Aquaria/Game.cpp

@@ -3885,7 +3885,7 @@ Bone *Game::collideSkeletalVsLine(Entity *skeletal, Vector start, Vector end, fl
 		Bone *b = skeletal->skeletalSprite.bones[i];
 
 		// MULTIPLE CIRCLES METHOD
-		if (!b->collisionMask.empty() && b->alpha.x == 1 && b->renderQuad)
+		if (b->canCollide() && !b->collisionMask.empty())
 		{
 			for (size_t i = 0; i < b->transformedCollisionMask.size(); i++)
 			{
@@ -3938,9 +3938,7 @@ Bone *Game::collideSkeletalVsCircle(Entity *skeletal, Vector pos, float radius)
 	{
 		Bone *b = skeletal->skeletalSprite.bones[i];
 
-		if (b->alpha.x == 1 && b->renderQuad &&
-			(!b->collisionMask.empty() || b->collideRadius) // check this here to avoid calculating getWorldCollidePosition() if not necessary
-		)
+		if (b->canCollide()) // check this here to avoid calculating getWorldCollidePosition() if not necessary
 		{
 			float checkRadius = sqr(radius+b->collisionMaskRadius);
 			Vector bonePos = b->getWorldCollidePosition();

Aquaria/ScriptInterface.cpp

@@ -4051,6 +4051,14 @@ luaFunc(bone_lookAtPosition)
 	luaReturnNil();
 }
 
+luaFunc(bone_toggleCollision)
+{
+	Bone *b = bone(L);
+	if(b)
+		b->enableCollision = getBool(L, 2);
+	luaReturnNil();
+}
+
 luaFunc(entity_stopFollowingPath)
 {
 	Entity *e = entity(L);
@@ -4420,17 +4428,36 @@ luaFunc(cam_setPosition)
 	luaReturnNil();
 }
 
+template<typename T>
+void spawnParticlesFromCollisionMask(lua_State *L, T *t)
+{
+	const char *p = getCString(L, 2);
+	if(!p)
+		luaL_error(L, "expected string partcle name");
+	int intv = lua_tointeger(L, 3);
+	if (intv <= 0)
+		intv = 1;
+	int lr = luaL_optinteger(L, 4, LR_PARTICLES);
+	float rotz = lua_tonumber(L, 5);
+
+	t->spawnParticlesFromCollisionMask(p, intv, lr, rotz);
+}
+
 
 luaFunc(entity_spawnParticlesFromCollisionMask)
 {
 	Entity *e = entity(L);
 	if (e)
-	{
-		int intv = lua_tointeger(L, 3);
-		if (intv <= 0)
-			intv = 1;
-		e->spawnParticlesFromCollisionMask(getString(L, 2), intv);
-	}
+		spawnParticlesFromCollisionMask(L, e);
+
+	luaReturnNil();
+}
+
+luaFunc(bone_spawnParticlesFromCollisionMask)
+{
+	Bone *b = bone(L);
+	if (b)
+		spawnParticlesFromCollisionMask(L, b);
 
 	luaReturnNil();
 }
@@ -5527,12 +5554,11 @@ luaFunc(entity_collideSkeletalVsCirclePos)
 luaFunc(entity_collideSkeletalVsLine)
 {
 	Entity *e = entity(L);
-	int x1, y1, x2, y2, sz;
-	x1 = lua_tonumber(L, 2);
-	y1 = lua_tonumber(L, 3);
-	x2 = lua_tonumber(L, 4);
-	y2 = lua_tonumber(L, 5);
-	sz = lua_tonumber(L, 6);
+	float x1 = lua_tonumber(L, 2);
+	float y1 = lua_tonumber(L, 3);
+	float x2 = lua_tonumber(L, 4);
+	float y2 = lua_tonumber(L, 5);
+	float sz = lua_tonumber(L, 6);
 	Bone *b = 0;
 	if (e)
 	{
@@ -10041,6 +10067,8 @@ static const struct {
 
 	luaRegister(bone_lookAtEntity),
 	luaRegister(bone_lookAtPosition),
+	luaRegister(bone_spawnParticlesFromCollisionMask),
+	luaRegister(bone_toggleCollision),
 
 	luaRegister(entity_partSetSegs),
 

BBGE/SkeletalSprite.cpp

@@ -71,6 +71,7 @@ Bone::Bone() : Quad()
 	fileRenderQuad = true;
 	skeleton = 0;
 	generateCollisionMask = true;
+	enableCollision = true;
 	animated = ANIM_ALL;
 	originalScale = Vector(1,1);
 	boneIdx = pidx = -1;
@@ -101,6 +102,11 @@ void Bone::destroy()
 	segments.clear();
 }
 
+bool Bone::canCollide() const
+{
+	return this->enableCollision && this->alpha.x == 1 && this->renderQuad && (!this->collisionMask.empty() || this->collideRadius);
+}
+
 void Bone::addSegment(Bone *b)
 {
 	segments.push_back(b);
@@ -280,6 +286,16 @@ void Bone::updateSegments()
 	}
 }
 
+void Bone::spawnParticlesFromCollisionMask(const char *p, unsigned intv, int layer, float rotz)
+{
+	for (size_t j = 0; j < this->collisionMask.size(); j+=intv)
+	{
+		Vector pos = this->getWorldCollidePosition(this->collisionMask[j]);
+		core->createParticleEffect(p, pos, layer, rotz);
+	}
+}
+
+
 bool BoneCommand::parse(Bone *b, SimpleIStringStream &is)
 {
 	std::string type;
@@ -895,6 +911,8 @@ bool SkeletalSprite::saveSkeletal(const std::string &fn)
 		bone->SetAttribute("fv", this->bones[i]->isfv());
 		bone->SetAttribute("gc", this->bones[i]->generateCollisionMask);
 		bone->SetAttribute("cr", this->bones[i]->collideRadius);
+		if(!this->bones[i]->enableCollision)
+			bone->SetAttribute("c", this->bones[i]->enableCollision);
 		if (!this->bones[i]->fileRenderQuad)
 		{
 			bone->SetAttribute("rq", this->bones[i]->fileRenderQuad);
@@ -1368,6 +1386,10 @@ void SkeletalSprite::loadSkeletal(const std::string &fn)
 			{
 				newb->generateCollisionMask = atoi(bone->Attribute("gc"));
 			}
+			if (bone->Attribute("c"))
+			{
+				newb->enableCollision = atoi(bone->Attribute("c"));
+			}
 			if (bone->Attribute("rq"))
 			{
 				newb->renderQuad = newb->fileRenderQuad = atoi(bone->Attribute("rq"));

BBGE/SkeletalSprite.h

@@ -67,9 +67,12 @@ public:
 	std::vector<Vector> changeStrip;
 
 	bool generateCollisionMask;
+	bool enableCollision;
 	int animated;
 	Vector originalScale;
 
+	bool canCollide() const;
+
 	void addSegment(Bone *b);
 	ParticleEffect *getEmitter(unsigned slot) const;
 
@@ -88,6 +91,8 @@ public:
 	bool selectable;
 	int originalRenderPass; // stores the render pass originally set in the XML file. For AC_RESET_PASS.
 
+	void spawnParticlesFromCollisionMask(const char *p, unsigned intv, int layer, float rotz = 0);
+
 protected:
 	std::vector<ParticleEffect*> emitters;
 	int minDist, maxDist, reverse;