I set all the material to `backFaceCulling = false;` but when I panning the camera my meshes cutting and go to vanish, how can I solve this problem

Your issue is camera clipping. Near (minZ) is clipping the object. You can play with minZ like in the playground bellow (even though I am not sure it’s smart to use negative minZ value). Maybe it should be better to set minZ = 0, and make sure that you limit zoom to the object, so it cannot come near enough to clip the object.

If you don’t understand what’s camera frustum and clipping planes, you can check this, or read through ton of material on the internet.

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