3D collision red frame

green frame is my collision shape, but to two objects stopped in red frame, can someone can tell me what the red frame is.

I guess not with this too little info : How to get help
At least you can share screenshots from editor or part of your code…

Looks like this explanation is the answer.

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thank you for answer, i read this page before, and it give me some ideas to write a small lib to generate .convexshape from .glb file, LyuRongjian/glb2convexshape (github.com) , it seems defold not support concave shape now, i will use some simple convex shapes to test.