Hello,

Thank you really, the solution with the "sticker" works perfectly !

Best regards from Switzerland,





"Tim Attwood" <tim### [at] comcastnet> wrote:
> >... Is it any solution to
> > produce the shadow of a texture ?
>
> A hollow plane is still conceptually solid for CSG,
> a intersection of a plane and a box results in a box...
> By texturing the box with Clear on 5 sides you just
> see into the hollow box, if the box happens to be
> sitting with a clear bottom that is coincident to
> some other object (like the default checkered
> plane) then you see thru that as well. Since you
> only really want the textured side, use clipped_by.
>
> And since you are trying to "fake" shadows, you
> probably don't want to see the texture itself.
> I might be OK just to make your texture mimic
> the shadow color, then place it near a flat surface,
> or use the object pattern to place it as a partially
> transparent layer on something.
>
> #declare H = 2;
> #declare W = 2;
> #declare nb_periods = 3;
> #declare length_period = H / nb_periods;
> #declare SinePig = pigment {
>    gradient x scale H/nb_periods
>    sine_wave
>    color_map {
>       [0 color <0,0,0> transmit 0.2]
>       [1 color <0,0,0> transmit 1]
>    }
> };
> // as a "sticker"
> plane { y, 0
>    pigment { SinePig }
>    clipped_by {
>      box {
>         <-H/2,-1,-W/2>,
>         <H/2,1,W/2>
>      }
>   }
>   translate <0,-0.999,0>
> }
>
> // as an object pattern
> plane {y,-1
>    texture {
>       pigment{checker White Wheat}
>    }
>    texture {
>       pigment {
>          object {
>             sphere {<0,-1,2>,1}
>             pigment {Clear}
>             pigment {SinePig}
>          }
>       }
>    }
> }

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