Ive <"ive### [at] lilysoftorg"> wrote:
> Kenneth wrote:

> > Sorry to be so brain-challenged, but: radiosity compatibility? I've seen that
> > term mentioned several times lately, and have no clue what it means re:
> > textures.  I must have missed something somewhere. Please explain?

>
> ambient 0 in the finish statement, otherwise it would emit light.
>
> For "radiosity-lit-only" scenes (or MCPov for that matter) it would even
> mean "specular 0" and "phong 0".
>

Got it. (Although the specular and phong stuff is new--I need to do some
experiments to see.)

Here's an 'old pitted iron texture' that I dug out of one of my scenes (I
actually started with one of the stones.inc pigments, and modified it)...

#declare old_pitted_iron_texture =
texture {
        pigment{
                granite  // AGATE works well for this too.
                color_map {

                        [0.000 rgb .8*<.4, .4, .380>]
                        [0.153 rgb .4]
                        [0.398 rgb .5*<0.7, 0.4, 0.25>]
                        [0.398 rgb .2*<0.7, 0.7, 0.7>]
                        [1.000 rgb <0.545, 0.380, 0.345>]
                          }

               }
        finish{
              ambient .2 // 0 for radiosity
              diffuse 1
              phong .6
              phong_size 24
        }
        normal {granite .7 scale 9}
    }

KW

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