arbitrary77 nous apporta ses lumieres ainsi en ce 19/07/2004 16:48... :

>Hi,
>
>I've found some older posts about this problem, but no solution so far, and
>it's really starting to annoy me. It doesn't seem to be a known bug or
>limitation, as far as I could find out. Anyway, here's the problem (using
>3.6.0.icl8.win32):
>
>I have a scene with fog, and a hollow transparent container object
>containing a media. But strangely enough, the otherwise completely
>invisible container object is still casting a shadow, and it only happens
>when there is fog. I added a small test scene which shows the problem.
>
>Of course I could make the container "no_shadow", but then the scattering
>media won't be shaded correctly any more, and it won't cast any shadow at
>all. Using a media fog is slow and looks even worse because of the
>intersecting media. A low ground fog, or a ground fog in the z direction is
>no option either, because I'd really like the media objects to be affected
>by the fog, at a close distance.
>
>Any explanations or ideas?
>
>--
>
>#include "colors.inc"
>
>camera {
>  perspective angle 50
>  location <0,1,0>
>  right x*(image_width/image_height)
>  look_at <0,1,1>
>}
>
>plane { y, 0 pigment { checker color rgb 1 color rgb 0.95 } }
>
>sphere {
>  <0,0,0> 1
>  pigment { Clear } hollow
>  interior { media { scattering { 1 3 } density { spherical scale 1/3 } } }
>  scale <2,0.5,2> translate <0, 2, 8>
>}
>
>fog { distance 20 color rgbf<0.7,0.7,0.7,0> }
>
>light_source { <500,1000,-1000> color rgb 1 }
>
>
>
>  
>
The "Clear" pigment is: rgbf 1. Have you tried rgbt 1?

Alain

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