anchor.diff:  
   				setupFrameBuffer( renderTarget.__webglFramebuffer, renderTarget, gl.TEXTURE_2D );
   
  -				if ( renderTarget.shareDepthFrom ) {
  +				if ( renderTarget.shareDepthFrom != null) {
   
   					if ( renderTarget.depthBuffer && ! renderTarget.stencilBuffer ) {
   
  
positive.code: 
  						var tangent = geometry.attributes[ "tangent" ];
  
  						if ( attributes["tangent"] >= 0 && tangent ) {
  
  							var tangentSize = tangent.itemSize;
  
  
negative.code: 
  						var normal = geometry.attributes[ "normal" ];
  
  						if ( attributes["normal"] >= 0 && normal != null) {
  
  							var normalSize = normal.itemSize;
  
  