You need to work with the 2D mesh that precedes Rubbersheet (whereupon it becomes 3D). I think Nancy's solution is correct but start with this mesh rather than the Rubbersheet. (You could start there, but you'd need to squash the Rubbersheet positions by stripping off the Z component, but why bother?)
The idea as you see is that both the mapper and the mappee have to have the same dimensionality of positions. If mapped data doesn't not fall onto or into the map surface or volumetric elements, those points will be invalid, so it behooves you to ensure that the mapped data actually hits the surface, thus, the projection is guaranteed to do that. Then follow Nancy's directions to re-expand everything back to the 3D representation. Chris Pelkie Vice President/Scientific Visualization Producer Conceptual Reality Presentations, Inc. 30 West Meadow Drive Ithaca, NY 14850 [EMAIL PROTECTED]
