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.

Post a reply to this message