Merge topic '14581-volume-render-bug' into pv-master

a43fb6ae Don't reset traversal location in each iteration of box clip filter.
Merge remote-tracking branch 'pvvtk/pv-master' into HEAD

* pvvtk/pv-master:

Change-Id: I1a00dc35822f8a50be7081040b985609f8120ac0