On 2013-12-13 14:35, Roman wrote:

> Thank you for clarifying this. To work around the problem, I'm currently
> scaling my whole scene to a size that works for all objects. That's a
> bit cumbersome though, and I'm worried that such a common error-free
> scale won't exist in all cases. IMHO this is a serious limitation of
> POV-Ray that should be fixed, if at all possible.


I'm still struggling with this issue. So I've rescaled everything to a 
size that works for sphere_sweep, but now some of my other objects look 
wrong. More precisely, their materials look wrong. I have narrowed it 
down to the minimal scene file below, which shows a sphere with a 
non-zero filter value in the pigment. Different scales result in 
different images. What gives? I'm confused.

-Roman



// START MINIMAL SCENE FILE

#version 3.7;

// 1e-2, 1e-3, 1e-4, 1e-5 all produce different images,
// 1e-6 even produces a parse error!
#declare s = 1e-6;

camera { location 3*s*z look_at 0 }

light_source { s*<10,5,20>, rgb 1 }

sphere { 0, s pigment { color rgb <1,0,0> filter 0.5 } }

// END MINIMAL SCENE FILE

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