Gyscos nous apporta ses lumieres en ce 12/04/2006 04:38:
> Hello again!
> Now my light is REALLY strange...
> 
> I have a sort of yellow thing that is stuck to the wall, butthe shadow is as
> if my thing was far from the wall...
> Plus, there is a brass ball that have a really strange shadow O_o
> 
> And if I apply a scale 20, the artifacts diseapear 0_o
> 
> Here is the image :
> 
> http://dragons.masters.free.fr/images/demo3.png
> 
> Here comes the code :
> 
> 
> 
> #include "colors.inc"
> #include "textures.inc"
> #include "metals.inc"
> 
> global_settings {
>   max_trace_level 20
> }
> 
> 
> // Change this and you will see
> // that the artifacts chenge... :-S
> 
> #declare echelle = 1;
> 
> camera {
>   location <-0.00,-0.7957,-1.308>*echelle
>   look_at <-0.0,-.791,-1.30001>*echelle
> 
> }
> 
> 
> #declare my_object = union {
>   union {
>     light_source {
>       <-0.22,-0.75,-1.40>
>       White
>     }
>     union {
>  box {
>    <0.025,-0,-1.3>
>    <-0.025,-0.87,-1>
>  }
>       mesh {
>  triangle {
>    <0,-0.79,-1.29999>
>    <0.004,-0.795,-1.29999>
>    <0,-0.7925,-1.303>
>  }
>  triangle {
>    <0,-0.79,-1.29999>
>    <-0.004,-0.795,-1.29999>
>    <0,-0.7925,-1.303>
>  }
>  triangle {
>    <0,-0.795,-1.29999>
>    <0.004,-0.795,-1.29999>
>    <0,-0.7925,-1.303>
>  }
>  triangle {
>    <0,-0.795,-1.29999>
>    <-0.004,-0.795,-1.29999>
>    <0,-0.7925,-1.303>
>  }
>  triangle {
>    <0,-0.795,-1.29999>
>    <-0.004,-0.795,-1.29999>
>    <0,-0.79,-1.2999>
>  }
>  triangle {
>    <0,-0.795,-1.29999>
>    <0.004,-0.795,-1.29999>
>    <0,-0.79,-1.29999>
>  }
>  inside_vector <0,1,0>
> 
>  texture {
>    pigment { Yellow }
>  }
>       }
>       sphere {
>  <0,-0.7935,-1.301>
>  0.001
>  texture {
>    Brass_Metal
>  }
>       }
>       texture {
>  pigment { Red }
>       }
>     }
>   }
> }
> 
> 
> 
> object {
>   my_object
>   scale echelle
> }
> 
> 
> 
You aparently tend to use a small scale, or very large units. The disapearance of the
problem by 
scaling up the scene point to rounding errors introduced by the arithmetic processor
(FPU).
A possible solution would be to use another, smaler "base unit".

-- 
Alain
-------------------------------------------------
'First things first -- but not necessarily in that order' -- Dr Who

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