Hey ockham,

Thanks for the response!

Yes, I am sure that SetX, etc. are indeed moving the world vertices to new positions.  It is worth noting that I am doing this from within the world space callback, so that might make a difference as far as how you can manipulate world vertices.

You are right that Lady Danbo's neck looks like it is in the same plane as her head, but in my example in the first post, that triangle is the only visible object in the scene.  The only other objects are the ground and an invisible pyramid.  I tried moving the triangle away from the ground and the invisible pyramid to be sure that they were not somehow overlapping with the triangle and causing an artifact, and it seems like they are not.  Regardless, they are not visible in the render.

PS.  Its a coincidence that my example bears a striking resemblence to the cover of Dark Side of the Moon. :-)

Check out my website: http://www.digitani.com