But your geometry is having weird backfaces where you can pick
The dark area, turn off backface culling so you can see them.
but picked system not detect backface right?
my purpose is know about full picked calculate mechanism
how can we know workflow of picked algoritm?
You can find the full workflow in the code in scene.inputManager.ts look for _onPointerMove which calls into scene.pick which is defined in ray.ts
thanks @sebavan you help a lot for this case just for last question the back face is picked in this workflow? before i have to check it i need know about that
yup it should as mono sided faces is just a visual optim trick not a feature of the geometry.
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Thanks 