>
> I'm trying to render a realistic looking Earth. I'm texturing an image and
> nomral map now I want to have specular map. I found I can do this with a
> material_map however when I add that into the mix (shown below) I get the above
> error. How can I have all 3 things: image_map, bump_map and material_map?
>
>
>
>   54 sphere {0,1
>   55   //finish { ambient 0.1 diffuse 0.5 specular 0.7 }
>   56   //pigment { White }
>   57   pigment {
>   58       image_map {
>   59         jpeg "earthmap4k.jpg" once map_type 2
>   60       }
>   61       translate <0,-0.5,0>
>   62       scale <1,2,1>
>   63   }
>   64   normal {
>   65     bump_map {
>   66       jpeg "earthbump4k.jpg" once map_type 2
>   67       bump_size 15.0
>   68     }
>   69     translate <0,-0.5,0>
>   70     scale <1,2,1>
>   71   }
>   72   texture {
>   73       material_map {
>   74         jpeg "earthspec4k.jpg"
>   75         once map_type 2
>   76         //interpolate 2 once
>   77         texture { LandTex }
>   78         texture { WaterTex }
>   79         }
>   80       translate <0, -0.5, 0>
>   81       scale <1,2,1>
>   82   }
>   83   rotate -180.0*y
>   84 }
>
>
>

A material_map is designed to works with palleted images. Using a high 
or true colour leads to problems as you'll need maps spanning a huge 
array of values.
A material_map DON'T contain materials but textures.

So, you may want to have a palleted, or B&W, source image with one index 
for the water and another for the ground areas. A pure black and white 
image will do just right and will be relatively small as a bonus: 1 bit 
per pixel.

Now, you need to provide the image_map for the ground areas with it's 
finish and normals and a texture for the water areas with the wanted 
specular.




Alain

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