Mike Horvath <mik### [at] gmailcom> wrote:
> I'm confused about how to set up a spherical density map.
>
> I want a density map that is dense at the origin, and stays dense until
> it gets close to 1 unit away, then fall off sharply.
>
> How would I set this up?
>
> Thanks.
>
>
> Mike


Here is a test scene you can play with.
Personally I use two density maps to be more flexible.
Of course one map would be sufficient...

///////////////////////////////////////////////////////////

#version 3.7;

global_settings {
        assumed_gamma 1
        max_trace_level 5
        noise_generator 2
}

#include "stdinc.inc"

#declare cam_loc = <0,0,-8>;
#declare lookat = <0,0,0>;
camera {
        location cam_loc
        look_at lookat
        right x*image_width/image_height
        up y
        angle 15*image_width/image_height
}

#macro Dens (glowcol)

#declare density_1 =
density {
        spherical
        color_map {
                [0.05   rgb 0]
                [0.15   rgb glowcol]
        }
}

#declare density_2 =
density {
        spherical
        color_map {
                [0.05   rgb 0]
                [0.7    rgb glowcol]
        }
}

density {
        average
        density_map {
                [1      density_1]
                [1      density_2]
        }
}

#end

#declare Color_ = <1,0.8,0.3>;
sphere {
        <0,0,0>, 2
        hollow
        pigment {color rgbt 1}
        interior {
                media {
                        emission rgb 1
                        Dens (Color_)
                }
        }
        scale 1
        translate 0
}
////////////////////////////////////////////////

Norbert

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