I tryied replacing 4 and 10 with 0.4 and 1 but flames density is too
transparent... quite invisible! How can I do?


Alain <ele### [at] netscapenet> wrote:
> danyolgiax nous apporta ses lumieres en ce 08/05/2006 11:13:
> > Hi!
> >
> > I've got an array of ships with engines at full throttle... when I render
> > the scene I've got this strange effect:
> >
> > http://img278.imageshack.us/img278/3478/ships2nu.jpg
> >
> > the ship at the top is ok! but the flames of the others ships looks
> > innaturals (no gradient... only white and red)!
> >
> > Why?
> >
> > Render parameters:
> >
> > -w800 -h450 +a0.3
> >
> > global_settings {
> >
> >     assumed_gamma 1 // tweak if the image is too pale
> >     max_trace_level 20
> >
> >        radiosity {
> >             count 35 error_bound 1.8
> >             recursion_limit 1
> >             low_error_factor .5
> >             gray_threshold 0
> >             minimum_reuse 0.015
> >             brightness 1
> >             adc_bailout 0.01/2
> >             normal on
> >             media off
> >         }
> >  }
> >
> > media {
> >   scattering {
> >        1, // isotropic
> >        rgb 0.02
> >   }
> > }
> >
> > This is the flame:
> >
> > #declare carFlame2=
> > union
> > {
> >     cone {
> >        <0,0,0>,0.5,<0,0,1>,0.3
> >        hollow
> >        pigment {rgbt <0,0,0,1>}
> >        interior {
> >           media
> >          { emission 4
> >            density
> >            { spherical density_map
> >              { [0 rgb 0]
> >                [0.4 rgb <1,0,0>]
> >                [0.8 rgb <1,0,0>]
> >                [1 rgb <1,0,0>]
> >              }
> >            }
> >          }
> >        }
> >     }
> >
> >
> >     cone {
> >        <0,0,0.4>,0.3,<0,0,1>,0.25
> >        hollow
> >
> >        pigment {rgbt <0,0,0,1>}
> >        interior {
> >           media
> >          { emission 10
> >            density
> >            { spherical density_map
> >              { [0 rgb 0]
> >                [0.4 rgb <1,1,0.502>]
> >                [0.8 rgb <1,1,0.502>]
> >                [1 rgb <1,1,0.502>]
> >              }
> >            }
> >          }
> >        }
> >     }
> >
> >     cylinder {
> >        <0,0,0.95><0,0,1>,0.2
> >        pigment {rgbf <1,1,1,0.1>}
> >        finish{ambient 1}
> >
> >     }
> >     cylinder {
> >        <0,0,0.96><0,0,1>,0.21
> >         hollow
> >        pigment {rgb <0,0,0,>}
> >
> >
> >     }
> >
> > }
> >
> > Thanks!
> >
> > Dox
> >
> >
> Your emission values are to large causing an oversaturation of the colours. emission
4 and 10
> effectively multiply your colour_map by 4 and 10 respectively. The red part been
only red, you don't
> realy see this, but, for the yellow part, you get an effective value of <10, 10,
5.02> witch gets
> clipped to <1,1,1>.
> When the "flame" get's scaled down, the reduced thickness reduce this effect.
>
>
> --
> Alain
> -------------------------------------------------
> AAAAAA: American Association Against Acronym Abuse and Ambiguity.

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