COLLADA conformance: don't write empty libraries for effect, image and animation

source/blender/collada/DocumentExporter.cpp

@@ -307,15 +307,19 @@ public:
 
 	AnimationExporter(COLLADASW::StreamWriter *sw): COLLADASW::LibraryAnimations(sw) { this->sw = sw; }
 
+
+
 	void exportAnimations(Scene *sce)
 	{
-		this->scene = sce;
+		if(hasAnimations(sce)) {
+			this->scene = sce;
 
-		openLibrary();
-		
-		forEachObjectInScene(sce, *this);
-		
-		closeLibrary();
+			openLibrary();
+
+			forEachObjectInScene(sce, *this);
+
+			closeLibrary();
+		}
 	}
 
 	// called for each exported object
@@ -905,6 +909,24 @@ protected:
 			}
 		}
 	}
+	
+	bool hasAnimations(Scene *sce)
+	{
+		Base *base= (Base*) sce->base.first;
+		while(base) {
+			Object *ob = base->object;
+			
+			FCurve *fcu = 0;
+			if(ob->adt && ob->adt->action)
+				fcu = (FCurve*)ob->adt->action->curves.first;
+				
+			if ((ob->type == OB_ARMATURE && ob->data) || fcu) {
+				return true;
+			}
+			base= base->next;
+		}
+		return false;
+	}
 };
 
 void DocumentExporter::exportCurrentScene(Scene *sce, const char* filename)

source/blender/collada/EffectExporter.cpp

@@ -55,15 +55,38 @@ static std::string getActiveUVLayerName(Object *ob)
 	return "";
 }
 
-
 EffectsExporter::EffectsExporter(COLLADASW::StreamWriter *sw) : COLLADASW::LibraryEffects(sw){}
+
+bool EffectsExporter::hasEffects(Scene *sce)
+{
+	Base *base = (Base *)sce->base.first;
+	
+	while(base) {
+		Object *ob= base->object;
+		int a;
+		for(a = 0; a < ob->totcol; a++)
+		{
+			Material *ma = give_current_material(ob, a+1);
+
+			// no material, but check all of the slots
+			if (!ma) continue;
+
+			return true;
+		}
+		base= base->next;
+	}
+	return false;
+}
+
 void EffectsExporter::exportEffects(Scene *sce)
 {
-	openLibrary();
-	MaterialFunctor mf;
-	mf.forEachMaterialInScene<EffectsExporter>(sce, *this);
+	if(hasEffects(sce)) {
+		openLibrary();
+		MaterialFunctor mf;
+		mf.forEachMaterialInScene<EffectsExporter>(sce, *this);
 
-	closeLibrary();
+		closeLibrary();
+	}
 }
 
 void EffectsExporter::operator()(Material *ma, Object *ob)

source/blender/collada/EffectExporter.h

@@ -57,10 +57,11 @@ public:
 											/*COLLADASW::Surface *surface*/);
 	
 	COLLADASW::ColorOrTexture getcol(float r, float g, float b, float a);
-	
-	//returns the array of mtex indices which have image 
-	//need this for exporting textures
+private:
+	/** Fills the array of mtex indices which have image. Used for exporting images. */
 	void createTextureIndices(Material *ma, std::vector<int> &indices);
+	
+	bool hasEffects(Scene *sce);
 };
 
 #endif

source/blender/collada/ImageExporter.cpp

@@ -46,13 +46,40 @@
 ImagesExporter::ImagesExporter(COLLADASW::StreamWriter *sw, const char* filename) : COLLADASW::LibraryImages(sw), mfilename(filename)
 {}
 
+bool ImagesExporter::hasImages(Scene *sce)
+{
+	Base *base = (Base *)sce->base.first;
+	
+	while(base) {
+		Object *ob= base->object;
+		int a;
+		for(a = 0; a < ob->totcol; a++)
+		{
+			Material *ma = give_current_material(ob, a+1);
+
+			// no material, but check all of the slots
+			if (!ma) continue;
+			int b;
+			for (b = 0; b < MAX_MTEX; b++) {
+				MTex *mtex = ma->mtex[b];
+				if (mtex && mtex->tex && mtex->tex->ima) return true;
+			}
+
+		}
+		base= base->next;
+	}
+	return false;
+}
+
 void ImagesExporter::exportImages(Scene *sce)
 {
-	openLibrary();
-	MaterialFunctor mf;
-	mf.forEachMaterialInScene<ImagesExporter>(sce, *this);
+	if(hasImages(sce)) {
+		openLibrary();
+		MaterialFunctor mf;
+		mf.forEachMaterialInScene<ImagesExporter>(sce, *this);
 
-	closeLibrary();
+		closeLibrary();
+	}
 }
 
 void ImagesExporter::operator()(Material *ma, Object *ob)

source/blender/collada/ImageExporter.h

@@ -49,6 +49,8 @@ public:
 	
 	void exportImages(Scene *sce);
 	void operator()(Material *ma, Object *ob);
+private:
+	bool hasImages(Scene *sce);
 };
 
 #endif