CompuServe Messages

You can't do displacements with scan-line renderers because they only look at a scanline at a time of the image. Only "tiling' renderers such as Rman (and DGS) can do displacements. The big negative is that they take an INCREDIBLY long time and are fraught with problems when you try to do more than a simple bump. Hair is almost impossible. This is why the folks at Ohio State had to write massively specialized code for it. – G