Why my 3d models have black gaps in coco2d-x?

Why my 3d models have black gaps in coco2d-x?

I had applayed the MultiSampling Anti-Aliasing in my ios project.
this is the code:

CCEAGLView *eaglView = [CCEAGLView viewWithFrame: [window bounds]
pixelFormat: (NSString*)cocos2d::GLViewImpl::_pixelFormat
depthFormat: cocos2d::GLViewImpl::_depthFormat
preserveBackbuffer: NO
sharegroup: nil
multiSampling: YES
numberOfSamples: 4 ];

Try to enable mipmaps

How to enable mipmaps?

Get the texture from Sprite3D or Mesh. Texture2D has the method generateMipmap

Thanks for your help,i will try it soon.