struct SetClipCmd

Sets/clears a node's clip. DEPRECATED: use SetClipPlanesCmd.

Constraints:

- `node_id` refs a `Node` with the has_clip characteristic.

- `clip_id` a `Node` with the is_clip characteristic, or nothing. If the

referenced node is not rooted, then it will have no effect (since its

full world-transform cannot be determined).

- `clip_to_self` If false, children are only clipped to the region specified

by `clip_id`. If true, children are additionally clipped to the node's

shape (as determined by its ShapeNode parts).

Discussion:

If a node has a clip, it will be applied to both the parts and the children

of the node. Under some circumstances (TBD), a clip will not be applicable

to a node; in such cases it will be as though no clip has been specified for

the node.