[Radiance-general] Using BRDF measurement representations with Radiance

[Greg Ward]

Hi Jeppe,

Check out "He.cal" in the ray/lib directory of the standard  
distribution.  It's a bit complicated, but you'll probably end up  
with something similar if you're building a parametric BRDF model.

You should be aware that Radiance doesn't do all it should with BRDF  
materials, in that the indirect component is approximated as  
diffuse.  Only highlights use the BRDF, not secondary rays, for  
efficiency.

-Greg

> From: Jeppe Vesterbaek <j.vesterbaek at cs.ucl.ac.uk>
> Date: October 5, 2005 10:21:19 AM PDT
>
> Hi
>
> I'm currently working on how to use measured BRDF data, e.g.  
> represented using a wavelet parameterization, with Radiance. I'm  
> struggling at bit with this, as documentation on using Radiance  
> with measured BRDF data seems not to exist? Can someone give me  
> directions, links to previous work on this, documentation or advice  
> on this?
>
> Thanks,
> Jeppe Vesterbaek
> Univesity College London
>