Le 15-04-28 12:58, Stephen a écrit :
> On 28/04/2015 16:33, MichaelJF wrote:
>> First a voxel within a df3-file can contain only a color and if the
>> color at the
>> border of the box described by the df3-file is not black which is
>> density zero
>> you will see the bounding box. So if you use df3 here you must assure
>> that the
>> fire is inside this box completely.
>
> This is very true.
> Another thing when using df3 files is that you can have several inside
> one media.
> The example below is from an old test of a bi-cubic Mandelbrot I did
> about 10 years ago. (Andrew/Orchid supplied the code for me to make the
> df3 files.) I posted the code and instructions to make them in
> povray.binaries.misc 2005
>
> I cannot remember why I used Red, Yellow and Blue.

Looking at your sampling parameters, and I say: "Ouch!"
1- With method 3, intervals must be set to 1. Any other value 
dramaticaly increase the rendering time, and may cause some artefacts.
2- samples only use the first value. If a second value is present, it 
will be silently ignored.
3- confidence, variance and ratio are NOT used in any way. The are 
specific to method 1 and 2 ONLY.

method 3 is the default method and don't need to be precised.

>
> #declare df3_cube01bddf_0 =
> material{
>    texture {
>      pigment {
>        color rgbft <1.000,0.000,0.000,0.000,1.000>
>      }
>
>    }
>
>    interior{
>      ior                 1.000
>      caustics            0.000
>      dispersion          1.000
>      dispersion_samples  7.000
>      fade_power          0.000
>      fade_distance       0.000
>      fade_color          rgb <0.000,0.000,0.000>
>      media {
>        method     3
>        intervals  20
>        samples    3, 6
>        confidence 0.900
>        variance   0.008
>        ratio      0.900
>        absorption rgb <0.000,0.000,0.000>
>        emission   rgb <1.000,0.000,0.000>
>        aa_threshold 0.100
>        aa_level    4
>        density {
>          density_file df3 "F:\Graphics\B3D Data\Maps\DF3\Mikes05r2.df3"
>          interpolate 1
>          scale     <2.000,2.000,2.000>
>          translate <-1.000,-1.000,-1.000>
>        }
>
>      }
>
>      media {
>        method     3
>        intervals  20
>        samples    3, 6
>        confidence 0.900
>        variance   0.008
>        ratio      0.900
>        absorption rgb <0.000,0.000,0.000>
>        emission   rgb <0.000,0.000,1.000>
>        aa_threshold 0.100
>        aa_level    4
>        density {
>          density_file df3 "F:\Graphics\B3D Data\Maps\DF3\Mikes05b2.df3"
>          interpolate 1
>          scale     <2.000,2.000,2.000>
>          translate <-1.000,-1.000,-1.000>
>        }
>
>      }
>
>      media {
>        method     3
>        intervals  20
>        samples    3, 6
>        confidence 0.900
>        variance   0.008
>        ratio      0.900
>        absorption rgb <0.000,0.000,0.000>
>        emission   rgb <0.400,0.400,0.000>
>        aa_threshold 0.100
>        aa_level    4
>        density {
>          density_file df3 "F:\Graphics\B3D Data\Maps\DF3\Mikes05y2.df3"
>          interpolate 1
>          scale     <2.000,2.000,2.000>
>          translate <-1.000,-1.000,-1.000>
>        }
>
>      }
>
>    }
>
> }
>
>

For your 3 medias, use this:
media{
  samples 100 // more samples and faster
  absorbtion...
  <rest of the media goes here>
}

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