@Mugen87 excuse me,i have found the reason in this:https://stackoverflow.com/questions/15994944/transparent-objects-in-threejs. does it exist other solution that solve this problem?set the renderOrder is not suit to my project,because i hava only one mesh that Loading by binaryLoader and this mesh include some geometry.And some errors have occurred when i set the depthWrite.LIke this:

the part inside will appear in the surface.
Sry, I don’t know. Maybe you can try to combine your three models into a single one?