I want to render an old scene I had written for pov 3.1. Because I want to change
some things and use 3.1 features I need to convert the halo to a media.

The old scene has following code:

halo {
    emitting
    spherical_mapping
    linear
    lambda 2
    turbulence <0.3,1,0.3>*1.2
    color_map {
      [ 0.0 color rgbt<1,0,0,1>]
      [ .5 color rgbt<1.75,1,0,0>]
      [ 1.0 color rgbt<2,2,0,-1>]
    } 
    jitter 0.1
    frequency 1
    samples 20
    scale 0.4
  }

My problem is that I don't remember what kind of pattern the two lines

spherical_mapping
linear

mean. Unfortunatley I have no more 3.0 docs. Does anybody of you remember the
meaning of this and know how to translate that to a density_map?

- Micha

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In article <3A71DED3.8CFCD3B1@gmx.net>, Micha Riser <mri### [at] gmxnet> 
wrote:
 
> My problem is that I don't remember what kind of pattern the two lines
> 
> spherical_mapping
> linear
> 
> mean. Unfortunatley I have no more 3.0 docs. Does anybody of you 
> remember the meaning of this and know how to translate that to a 
> density_map?

Well, I would start with the "spherical" pattern... ;-)
An attempt at translating is below. (Note: I never did much with halo, 
and have no way to check to see how similar the media is, so this is 
just a guideline for the syntax.)

media {
    emission color White
    method 3// Use this if using MegaPOV, if not,
            // remove this and use more intervals.
    intervals 1// using 2 or 3 may help, I almost always use 1, but
               // the official version requires much more.
    samples 20, 20
    density {spherical// ramp_wave and frequency 1 are default
        turbulence <0.3,1,0.3>*1.2 lambda 2
        scale 0.4
        color_map {// media ignores transmit and filter and uses the
                   // brightness of the color to determine density
                   // use the color for "emission" to specify the overall
                   // density
            [0.0 color rgb < 0, 0, 0>]
            [0.5 color rgb < 1.75, 1, 0>]
            [1.0 color rgb <-2,-2, 0>]// I don't know what was intended
                                      // with the negative transmit...
        }
    }
}

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

<><

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Thank you Chris! This gave the same pattern as with the halos. I just had to play
a little around with the color strengths in the color_map and now it looks nearly
the same. 

- Micha

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Here's another one where I have big problems converting it:

 halo{
    emitting
    planar_mapping
    poly
    exponent 2.5
    omega 1.07
    lambda 1.6
    turbulence <6,1,6>
    color_map{
     [0 color  rgbt<0.5,0,0,1>]
     [.5 color rgbt<1.75,1,0,0>*0.5]
     [1 color rgbt<2,2,0,0>*0.4]
    }
    translate<5,0,0>
    scale <1,0.7,1>
    samples 20
   }

Any help is appreciated.

- Micha

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In article <3A730841.432BCFFB@gmx.net>, Micha Riser <mri### [at] gmxnet> 
wrote:

> Here's another one where I have big problems converting it:
> 
>  halo{
>     emitting
>     planar_mapping
>     poly
>     exponent 2.5

Try "planar poly_wave 2.5" as the pattern. The other changes should be 
similar to your previous example...put pattern and color_map stuff in a 
density {} block, remove filter/transmit values and adjust color_map, 
etc...

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

<><

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