"Micheus" <nomail@nomail> wrote in message 
news:web.4a36c43a438fc1fb194bff60@news.povray.org...
>
> ...
>
> So, now I go to an other level...
> In the true I want use this effect with "mesh" objects and solved this 
> doubt I
> would like to try this code with an irregular mesh (see:
> http://img196.imageshack.us/img196/4778/lavalampwings3d.png) - the yellow 
> lava
> "balls".

You can fill any shape with an interior, so you can use something similar to 
this effect on a mesh or mesh2 object. The example below uses the POVRay 
blob primitive for lava balls (as I didn't have suitable mesh shapes to 
hand). I think the best approach would be to use a simple flat emission 
color to fill the main body of the object. If you just use the spherical 
emission statement as you had before, you'll get a single red/yellow 
transition passing through the entire multi-blob object.

This doesn't mean you're stuck with flat colors though because you can add 
multiple media statements within an interior block and POV-Ray should add 
the media together. For example, you could have a flat red media and 
superimpose multiple spherical media that transition from yellow to nothing. 
I've added one such yellow transition at the centre of the central blob, but 
you could add one for each blob.

I think you should be able to get about as sophisticated as you want with 
this general approach.

camera {location <-2, 1.2, -5> look_at 0}
light_source {<2,20,-4> color rgb 2}

#declare nebulosa = blob { threshold 0.6
  // Central Blob
  sphere {0,2,1}
  sphere {y,1,1}
  // Left Blob
  sphere {<-1.6,1.6,0.7>,1.5,1}
  sphere {<-1.1,2.2,1  >,1  ,1}
  // Right Blob
  sphere {<1,1.8,1.2>,1.2,1}
  sphere {<1,2.3,1  >,1.2,1}
}

object { nebulosa scale 0.5
  pigment {rgbt 1 } hollow
  interior {
    media {emission rgb <1,0,0>}
    media {emission 1
      density {spherical
        density_map {
          [0   rgb 0]
          [0.2 rgb 0]
          [0.5 rgb <1,1,0>]
          [1   rgb <1,1,0>]
        }
      }
      scale <0.3,0.6,0.3>
      rotate z*8
      translate 0.15*y
    }
  }
}

plane {y,-1 pigment {rgb 0.1}}


> Don't POV have a way to use object shape? (only: bozo, wood, gradient, 
> waves,
> spherical, planar, cylindrical, and boxed)

Yes you can use any pattern and there is an object pattern, which should 
enable you to use any object shape to control the media. The problem with 
this is that it transitions from 0 to 1 immediately at the surface of the 
object, so it doesn't give you any sort of progressive change. I suspect 
that it's therefore mostly useless for what you want to do.

Regards,
Chris B.

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