Texture coordinate Cocos3d [closed]

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Here is how I put my texture on my object :

_obj = (CC3MeshNode *)[_world getNodeNamed:@"s0"];
_obj.material.texture = [CC3Texture textureFromFile:@"objTextureLayout.png"];

My object is loaded from 3DMAX and I don't understand why my texture coordina开发者_如何转开发te (from 3DMax) is lost...

An other problem, I don't understand why my normals is flipped on a simple polygon. What could I've forgotten ?

Any suggestion ? I can post some screenshot or even the model with texture for a best comprehension for anybody who can help me.