PickTarget
What target to use for picking.
@ PICK_EDGE
picks edges (may not be implemented for all nodes)
@ PICK_ANYTHING
pick any of the prior targets (should be implemented for all nodes)
@ PICK_CELL
picks faces (may not be implemented for all nodes)
@ PICK_SPLINE
Pick spline curve or surface (picks u or u,v coords respectively)
@ PICK_FRONT_VERTEX
picks only visible front verices (may not be implemented for all nodes)
@ PICK_FACE
picks faces (should be implemented for all nodes)
@ PICK_VERTEX
picks verices (may not be implemented for all nodes)
@ PICK_FRONT_EDGE
picks only visible front edges (may not be implemented for all nodes)
Namespace providing different geometric functions concerning angles.