So finally, is it a bug or not ? It's like at least that the official 
binary version for linux produces the "bug". So, even if it's slower, 
why not changing the zero thickness box to a square mesh or a very thin 
box that won't produce the weird behavior ?

Nico

Lutz-Peter Hooge wrote:
> Nico <rou### [at] loriafr> wrote:
> 
> 
>>But when I render the screen.pov example file I get the attached image.
> 
> 
> I get the same image in a MingW (gcc 3.2) compile. 
> recompiling without -ffastmath fixes this.
> 
> Minimal scene that will show the bug:
> 
> //#declare epsilon = 0.000000000000001; // this works
> #declare epsilon = 0;                   // this not
> box {
>  0, <1,1,epsilon>
>  pigment {color rgb 0}
>  translate <-0.5,-0.5,0>+2*z
>  scale 0.02
> }
> background{color rgb 1}

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