Ah, I see. Well, sometimes Basic is easier than English I guess. Anyway, I have used fitmesh on all types of meshes when I was testing my editor, and I discovered that if you try to fitmesh a mesh quad, it will dissapear:
Open in online IDEGraphics3D 800, 600, 0, 2 SetBuffer BackBuffer() camera = CreateCamera() MoveEntity camera, 0, 0, -15 plane = CreateMesh() surf = CreateSurface(plane) AddVertex surf, -1, -1, 0 AddVertex surf, 1, -1, 0 AddVertex surf, 1, 1, 0 AddVertex surf, -1, 1, 0 AddTriangle surf, 0, 1, 2 AddTriangle surf, 0, 2, 3 FlipMesh plane RenderWorld Text 0, 0, "before fitmesh" Text 0, 20, "press any key" WaitKey() FitMesh plane, -1, -1, -1, 2, 2, 2, 1 RenderWorld Text 0, 0, "after fitmesh" Flip WaitKey() End