This is just a general comment (I'm not familiar with his proposal or our
lighting system) but in general radiosity (or photon mapping) can be done
per color component: red, green and blue channels independently. This way,
each channel has just one parameter which is its reflectivity.The
combination of the three parameters give reflectivity and color.
If what he needs is just a color-independent reflectivity index, he can
average the three components, effectively making the diffuse texture
grayscale and giving him a reflectivity map for the surface...
On Fri, Jun 18, 2010 at 10:23 AM, res <[email protected]> wrote:
> On 18.06.2010 19:06, Eduardo Poyart wrote:
> > Can't Mohit's tool do the same? In other words, it could read the
> > texture and use it as the answer to his question of what percentage of
> > photons are reflected from a surface.
>
> Part of the issue is that the diffuse texture combines two pieces of
> information - the reflectivity and the color. (Compare: dark red vs
> bright red - same base color, but different perceived reflectivity.)
>
> But well, if I had to invent a way that only uses that diffuse texture,
> I would try to extract these two bits from the combined texture color
> (like, normalize color value + use factor relative to original color as
> the reflecitivity).
>
> -f.r.
>
>
>
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