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Block rotation with gizmo if mesh goes under the ground


nathanidp
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Hello ! 
I'm currently using the rotation gizmo of babylon to rotate some objects.
However I try to block the rotation if the mesh goes under the ground while rotating.
I'm doing a test between the mesh.boundingbox.minimumworld.y and the ground.position.y but I don't know how to block the rotation correctly since the minimumworld.y is a float value which is already at the start less than the ground.position.y .

Any help is welcomed :)

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