Am 24.07.2016 um 10:19 schrieb kurtz le pirate:

>   density_map {
>    [ 0.00 rgb <0.39607808, 0.45490193, 0.97254896> ] // exterior
>    [ 0.25 rgb <0.54705858, 0.59117645, 0.97941172> ]
>    [ 0.50 rgb <0.69803905, 0.72745097, 0.98627448> ]
>    [ 0.75 rgb <0.84901953, 0.86372548, 0.99313724> ]
>    [ 1.00 rgb <1.00000000, 1.00000000, 1.00000000> ]
>    }
> 
> 1) : images are same whit or without step 0.25,0.50,0.75 in density_map.
>     Why ?

Because those steps are just a linear interpolation of the values at
0.00 and 1.00? ;)

If you really want steps, you'll need to specify two colour values for
one and the same parameter values, e.g.:

density_map {
  [ 0.00 rgb <0.39607808, 0.45490193, 0.97254896> ]
  [ 0.25 rgb <0.39607808, 0.45490193, 0.97254896> ]
  [ 0.25 rgb <0.54705858, 0.59117645, 0.97941172> ]
  [ 0.50 rgb <0.54705858, 0.59117645, 0.97941172> ]
  [ 0.50 rgb <0.69803905, 0.72745097, 0.98627448> ]
  [ 0.75 rgb <0.69803905, 0.72745097, 0.98627448> ]
  [ 0.75 rgb <0.84901953, 0.86372548, 0.99313724> ]
  [ 1.00 rgb <0.84901953, 0.86372548, 0.99313724> ]
  [ 1.00 rgb <1.00000000, 1.00000000, 1.00000000> ]
}


> 2) : here, spherical pattern is use for density. is it possible to use
> other thing like gausssian curve for exemple. More generaly, how to
> change pattern with f(x,y,z) for density pattern.

Look up "function pattern" (not to be confused with "pattern function").

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