Just a note, if you want the checkers to appear properly on the plane, give it a geometry modifier, and check “Export texture coords”.
I’m investigating the rest.
Edit: Oh, of course. (I lost my frikkin post. Argh!)
Basically, you can’t use Base to pivot for RiSphere, as it is an implicit primitive. It places it wherever your pivot is, and uses that as the centre. There are no polygons that describe it so it can’t do anything but that. The base to pivot option only shows up in the create panel, due to a maxscript limitation. If you go to the modify panel, it won’t be there.
You can fix it on existing RiSpheres by going Affect Pivot only, Center to object.
The polygon sphere should work though.
Gonna try your new release, cya!
