Rotation Correction

Working on fixing the rotation orientation.  Other importers align the
point cloud with wherever the camera is, but since I’m using Blender’s
clip functionality, the Z axis is up-side down with the
coordinates/math I’ve been using, so I’ve been working on scripting a
local-Z 180-degree rotation so the image ‘up’ aligns with the camera’s
‘up’.  Damn, math is hard.