"Kenneth" <kdw### [at] earthlinknet> wrote:
> Since you're trying to keep all of the textures as part of your macro (and not
> added later), here's an idea (I haven't tried it though) that uses Jim's
> suggestion of inside_texture, but done differently:
>
> #macro dome(position, rayon, insideTexture, outsideTexture)
>      difference{
>        difference{
>            sphere{position, rayon*1.11 texture{outsideTexture}}
>            sphere{position, rayon
>                 texture{pigment{rgb .5}} // any color at all, for the 'outside'
>                                          // of this dome shape
>                 texture{insideTexture}
>          }
>          box{position-<rayon*1.11,0,rayon*1.11>,
>  position+<rayon*1.11,rayon*1.11,rayon*1.11>}
>      }
>  #end
>
> Due to the fact that, for any object, an inside_texture needs a preceding
> texture (an 'outside' one) to work at all, the idea is that the 'outside' of the
> 'inner' dome shape gets some kind of arbitrary texture first (which will not be
> seen in your case--hopefully!), *then* an inside_texture can be applied to it.
>
> Again, just a suggestion; I'd be curious to know if it works!
>
> Ken W.

Thanks, I gave it a try but this result in only the grey color (rgb .5) showing
up in the inside of the hemisphere...

I think my macro :
#macro dome(position, rayon, insideTexture, outsideTexture)
    difference{
        difference{
            sphere{position, rayon*1.11 texture{outsideTexture}}
            sphere{position, rayon texture{insideTexture}}

        }
        box{position-<rayon*1.11,0,rayon*1.11>,
position+<rayon*1.11,rayon*1.11,rayon*1.11>}
    }
#end

is not the problem because it does produce a dome with 2 different textures for
the outer surface and the inside surface.


I believe the problem is in the projection of the texture on the inside of the
dome. I should have made that clearer in the first post.

I can't find the proper texture definition. I tried different
parameters for the image_map but I'm going nowhere.

Pictures are worth thousands of words:

For instance, if I want to use this image as a texture:
http://imgur.com/C2fQp.gif

Here are some settings I tried :
NOTE: the black ring is the rim of the dome, the camera is looking straight into
the interior of the dome.

1)http://imgur.com/IGjYT.png
texture{
    pigment{
    uv_mapping
        image_map{gif "data/grid.gif"}
    }
}


and it produce the same result as

texture{
    pigment{
        image_map{gif "data/grid.gif" map_type 1}
    }
}

where map_type 1 is a spherical mapping.

2)http://imgur.com/Vna78.png
texture{
    pigment{
        image_map{gif "data/grid.gif"}
    }
}

3)http://imgur.com/7CPyk.png
texture{
    pigment{
        image_map{gif "data/grid.gif" once}
    }
}

In this case the texture doesn't show up, all you can see is the dark rim, which
I think is using data from the image_map. The green colour comes from the
outside part of the dome for some reason....



I hope this will make the problem clearer. I'm not very familiar with the
mathematics and the vocabulary involved here so please bare with me.

For reference : http://www.povray.org/documentation/view/3.6.1/408/

Regards,
Jonsku

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