I have the same issue. But If I lauch the app with Debugger Mode (XCode) it always return the same issue above "[MTLDebugDevice validateNewBufferArgs:options:]:467: failed assertion `Cannot create buffer of zero length.'". But if I lauch without Debugger Mode (not include XCode) it's okay but in that case the shape is not correctly with my wishes, of course it doesn't crash my app. So Anyone can tell me Why in Debugger Mode, it will broken my app but in Release Mode it doesn't? In Release Mode, Why Sometimes the Sceneview can show my shape with "cross line" and sometimes it will not? I really thank and appreciate any advice on my issue.