"Bruno Cabasson" <bru### [at] alcatelaleniaspacefr> wrote:
> "Bruno Cabasson" <bru### [at] alcatelaleniaspacefr> wrote:
>
> > AFAIK, an image_map is only defined in the x-y plane. So, I guess that using
> > it as a 3 dimensional pattern will lead to non-zero values only in that
> > plane, and therefore your density will be non-zero in an infinitely thin
> > slice of your container, ... which I am afraid will also be valuated to
> > zero.
> >
> >    Regards.
>
> Ooops! not 100% awake this morning ... My reply was not very smart ...
> Forget it. Mike's is much more sensible ...

I had a cofee and my brain functions a little now ;)

This piece of code works:

#declare my_pattern = function
{
    pigment
    {
        image_map
        {
            png "my_image.png"
            map_type 0
            interpolate 2
            once
        }
    }
}

box
{
    0, 1
    pigment {rgbt 1}
    hollow
    interior
    {
        media
        {
            emission Red
            density {function  {my_pattern(x,y,z).red}}
        }
        media
        {
            emission Green
            density {function  {my_pattern(x,y,z).green}}
        }
        media
        {
            emission Blue
            density {function  {my_pattern(x,y,z).blue}}
        }
    }
}

Regards

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