> > Hi again....
> > So it turned out snell's law was alright. What I ment to ask was, if it was
> > a cheap approximation. It just sorta came out wrong.
> It's not so much a cheap hack as an inexpensive hack.
No, it's actually an accurate model of the geometry of refraction at a
smooth interface. For a quantitative model, you need the Fresnel
equations, as noted earlier in this thread. With these two, you can do
an excellent job modeling glass and similar materials.
Quote:> You might want to
> search for Cook-Torrence with Google.
Or better, Cook Torrance. That will work better :).
> Here's a pretty page that mentions
But the Cook-Torrance model is a very different animal. First, it
deals with reflection, not refraction. Second, it deals with very
rough surfaces, not smooth surfaces. It is quite useful, but doesn't
have a lot to do with Snell's law.
-Stephen H. Westin
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