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