Why does this happen when I move angles? I am not that much of an experienced mesh modeler but I have no idea how to fix this! Here is the FBX file: Rock.fbx (23.6 KB) [Screenshot_1]

Your normals are inverted—try following these steps to fix the issue: [image] Blender Mesh losing faces when imported Building Support It looks like your normals are facing inward instead of outward. Every face on a 3D model can only be seen from one side and not the other…