"Robert McGregor" <rob### [at] mcgregorfineartcom> wrote:
> "Thomas de Groot" <t.d### [at] internlDOTnet> wrote:
> > That looks very convincing, Robert. How did you do the compositing?
>
> It was inspired by some code Mike Williams wrote a few years back for color
> attenuating an image. This is just a quick hack - I plan to refine it in the
> next few days into something more useful:
>
> global_settings { assumed_gamma 1 }
>
> camera {
>    orthographic
>    location <0, 0, -1>
>    look_at <0, 0, 0>
>    right  x*image_width/image_height
> }
>
> #declare DT_AO     = 1;  // the ambient occlusion map
> #declare DT_Normal = 2;  // the normal render map
> #declare DT_Mult   = 3;  // the multiplied AO*Normal map
>
> //#declare Display_Type = DT_AO;
> //#declare Display_Type = DT_Normal;
> #declare Display_Type = DT_Mult;
>
> #declare p1 = pigment {
>    image_map { tga "budha_ao.tga" interpolate 2 map_type 0 once }
>    translate -0.5
> }
> #declare p2 = pigment {
>    image_map { tga "budha.tga" interpolate 2 map_type 0 once }
>    translate -0.5
> }
>
> #declare fp1 = function { pigment { p1 } };
> #declare fp2 = function { pigment { p2 } };
>
> #declare RED = pigment {
>    function { fp1(x,y,z).red * fp2(x,y,z).red }
>    color_map { [0 rgb 0][1 rgb <1,0,0>] }
> }
>
> #declare GREEN = pigment {
>    function { fp1(x,y,z).green * fp2(x,y,z).green }
>    color_map { [0 rgb 0][1 rgb <0,1,0>] }
> }
>
> #declare BLUE = pigment {
>    function { fp1(x,y,z).blue * fp2(x,y,z).blue }
>    color_map { [0 rgb 0][1 rgb <0,0,1>] }
> }
>
> #declare p3 = pigment {
>    average
>    pigment_map {
>       [1 RED]
>       [1 GREEN]
>       [1 BLUE]
>    }
> }
>
> plane { z, 0
>    hollow
>    #switch (Display_Type)
>       #case (DT_AO)
>          pigment { p1 }
>          finish { ambient 1 diffuse 0 }
>          #break
>       #case (DT_Normal)
>          pigment { p2 }
>          finish { ambient 1 diffuse 0 }
>          #break
>       #case (DT_Mult)
>          pigment { p3 }
>          finish { ambient 3 diffuse 0 }
>          #break
>    #end
> }

Thank you.
I find it very interesting.

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