Hi Guys,
I was searching the forum for IOR and didn't find anything like this, so I thought I'd share it with you all. It's a site with a list of hundreds of materials and their IOR values. Hopefully it's helpful for a few of you. Or, if anyone knows of better lists or sites, please pass them along.
IOR / Index of Refraction List - Pixel and Poly
-Mark
Thanks Mark...but an index of refraction is only useful for light transmission, not so much for light reflection which is what most of rendering surfaces is concerned with. In the time I've worked with Visualize, I've only tweaked an IOR for varying thicknesses of clear plastic and glass. And even where I've rendered spectroscopy lenses of pretty esoteric materials, adjusting the Visualize IOR setting did diddly-squat.