RoyLai

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**Before cutting:** ![demo2](https://user-images.githubusercontent.com/17867852/139782416-784cb419-d888-4628-a2b1-442f88a8051d.png) **After cutting:** ![image](https://user-images.githubusercontent.com/17867852/139782308-b997b29e-c1fb-4b7f-873e-50fd9f81a5a7.png)

As we know, the operation of 3D model is also very important. The opertation include: union, substraction, intersection etc. ![image](https://user-images.githubusercontent.com/17867852/139987830-5d1b72dc-e350-42dd-821c-3096ccec2f23.png) May I ask if you have any plan for this...