I want to limit this point to dragging and dropping on the surface of an object, is there a good way
One simple solution is to use raycasting. Meaning you cast a ray based on the position of your red point and a direction vector that points towards the blue surface. You can then allow a transformation of your point as long as the ray intersects the surface. If no intersection is detected, the point is obviously “outside” of the surface.
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oh,that sound great,thanks boss