Yes sorry I was Michael - Rhino via Grasshopper. In that case, it appears that each polygon has a different colour within the mesh. I think Gouraud was what I was getting at, the gradient has to be interpolated to give a smooth look...I don't quite know how to approach this predicament! Does anyone know of any softwares that will allow me to play around with such shading using open nurbs objects (pipe dream)?

This is all very interesting thank you!

- Rich