add transparent property

cocos/3d/CCMesh.cpp

@@ -43,6 +43,7 @@ Mesh::Mesh()
 , _visibleChanged(nullptr)
 , _glProgramState(nullptr)
 , _blend(BlendFunc::ALPHA_NON_PREMULTIPLIED)
+, _isTransparent(false)
 {
     
 }

cocos/3d/CCMesh.h

@@ -132,8 +132,8 @@ protected:
     Texture2D* _texture;  //texture that submesh is using
     MeshSkin*  _skin;     //skin
     bool       _visible; // is the submesh visible
+    bool       _isTransparent; // is this mesh transparent, it is a property of material in fact
     
-    //since 3.3
     std::string  _name;
     MeshIndexData*     _meshIndexData;
     GLProgramState* _glProgramState;