Accuracy of the "refract" instruction

OpenGL
1

Hi all,

I was wondering if the refract instruction in GLSL is accurate from a physical point of view.
I mean that, is the vectorial approach used to compute the refraction vector in GLSL gives the same result as if we applied the law of Snell-Descartes in Physics ?

If it is an approximation, does someone know its quality ?

Cheers,
Jeff.

2

Maybe this site would help: http://en.wikipedia.org/wiki/Snell's_law

On teh bottom, there is a derivation for a vector form of the law, just compare it to the one in the GLSL specification.

(A hint: they are the same)

3

And for a wonderful derivation of this, see Glassner’s classic text, volume 2.

4

see Glassner’s classic text, volume 2.
The name of this classic text being… what?

5

Sorry, it’s Andrew Glassner’s Principles of Digital Image Synthesis.

6

Thanks for your replies, I am going to check these out and I’ll post the answer that I will come to.

Cheers,
Jeff.

7

This topic was automatically closed 183 days after the last reply. New replies are no longer allowed.