Alain <aze### [at] qwertyorg> wrote:

> > Hy all!
> >
> > I must do a believable emissive turbine for a spaceship. What methods should I
> > use for that?
> >
> >
>
> Just what is an "emissive turbine"?
>
> You ether force some fluid into a turbine to get a circular motion or
> use a circular motion to pump some fluid through the turbine, usualy at
> great speed or persure.
>
> NO "beleivable" spaceship EVER use a turbine for anything else than push
> propergols into it rocket engines. Those turbines are usualy NOT visible
> except in a closeup of the area behind the rockets. And, those looks
> just like your regular turbine. Just take a look at a turbo charger for
> a good example.
>
> And no, SF movies spaceships are absolutely not beleivable except some
> from Babylon 5. The Furyes fighters are the most beleivable space
> fighters ever in any movie. Ther maneuvering is physicaly correct.
>
>
> Alain


I have already done with this emissive turbine. I have modified an another code,
what represents a candle flame.
Now I have a spaceship with blue flame.

I have a big problem. If I put this code to my pov file:
include "stars.inc"
sphere{ <0,0,0>, 1
        texture{ pigment{color rgb<0,1,0>}//Starfield1 scale 0.2
               } // end of texture
        scale 1000000
      }
Then I can't see the flame. How can I solve this problem? That's very important.
This is the code of the blue flame:
object{

  merge{    // egg
intersection{
   sphere{<0,0,0>,1}  box{<-1,-1,-1>,< 1,1  ,1>} scale <1,2.5,1>}
intersection{
   sphere{<0,0,0>,1}  box{<-1,-1 ,-1>,< 1,0+0.01,1>} }
}//- ------------------------------------------------
  hollow
  pigment { color rgbf<1, 1, 1, 1> } // fully transparent !!!
  finish { ambient 0 diffuse 0 }
  interior {
    media {
      //emission    color rgb < 1.0, 0.75, 0.1>*1.75
      emission    color rgb < 0.0, 0.1, 1.0>*2.75
      intervals 9
      samples 1, 20
      confidence 0.9999
      variance 1/100
      density{ spherical
               ramp_wave
               turbulence 0.15
               color_map {
                  [0.0 color rgb <0.0, 0.0, 0.0>]
                  [0.6 color rgb <0.8, 0.3, 0.0>]
                  [0.9 color rgb <1.0, 0.8, 0.3>]
                  [1.0 color rgb <1.0, 1.0, 0.1>]
                         }
               scale <1,2.5,1>
             } // end density
     }//end of media

     media {
       //emission color rgb < 1.0, 0.75, 0.1>*2.75
       emission color rgb < 0.0, 0.1, 1.0>*5.75
       intervals 3
       samples 32
       method 3
       aa_threshold 0.1 aa_level 5
       density {crackle  turbulence 0.8
                scale 0.75 translate<0,24,0>
                color_map {
                    [0 rgb 0]
                    [0.00 rgb 0]
                    [0.07 rgb 1]
                    [0.10 rgb 1]
                    [0.12 rgb 0]
                    [1.00 rgb 0]
                }
            } // end density
       density {spherical
                color_map {
                    [0 rgb 0]
                    [0.7 rgb 1]
                    [1 rgb 1]
                }
            } // end density
           scale <2,5,2>*0.5
       translate<0,0.01,0>
     }// end media

    }//end of interior
   //scale <1,1.5,1>*0.5
   //rotate<90,90,0>
   scale <1, 1.5,1 >*0.5
   translate  <-2.5, -5, -0.3>
   rotate<90,90,0>
   hollow // !!!!
  }

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