A node that provides a thickened polygon shape (a prism) to a [CollisionObject3D] parent and allows to edit it. The polygon can be concave or convex. This can give a detection shape to an [Area3D] or turn [PhysicsBody3D] into a solid object.
[b]Warning:[/b] A non-uniformly scaled [CollisionShape3D] will likely not behave as expected. Make sure to keep its scale the same on all axes and adjust its shape resource instead.
[b]Note:[/b] The returned value is a copy of the original. Methods which mutate the size or properties of the return value will not impact the original polygon. To change properties of the polygon, assign it to a temporary variable and make changes before reassigning the [code]polygon[/code] member.