Am 27.08.2016 um 13:35 schrieb Bald Eagle:
> I have to be out for most of the day today, but I figured if we were searching
> for a "bicycle" that already exists, then a search ought to pick up a nice
> parametrizable equation.
> 
> I started off with blackbody and Maxwell-Boltzmann distributions, but then
> enough coffee kicked in...   ;)
> 
> https://www.google.com/#q=brdf+code
> 
> http://graphicrants.blogspot.com/2013/08/specular-brdf-reference.html
> https://support.solidangle.com/pages/viewpage.action?pageId=5800819
> 
> https://www.google.com/#q=highlight+reflection+distribution
> 
> 
> What's the "input" for this algorithm?  A vector?   I'm assuming that the output
> is just the vector on the unit sphere.  I'm trying to visualize where this
> "plugs in" to the pixel-evaluation chain of events.

Congratulations, it seems like you've just found out what a BRDF is...
now to my problem of generating random numbers with a distribution that
is reasonably close to a given BRDF (in order to get an efficient
sampling), while keeping track of the probability of the numbers we're
generating (in order to compensate for the virtually inevitable mismatch) ;)

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