Maybe it would be a good idea to allow settings afair "shadow tollerancy" in global
settings?

Problem is with shadows, as mentioned often - small objects (about 0.01 units) causes
sometimes 
invalid shadows.

I have a scene where "typical" size is 1 unit, a small detais have 0.01 units and
less. Their are causing 
invalid shadows :(

btw. other "epsiolns" maybe also should be defined in global_settings, like depth
tollerancy in afair sphere 
sweep, or  0.001 texture offset for AFAIR checker

-- 
#macro g(U,V)(.4*abs(sin(9*sqrt(pow(x-U,2)+pow(y-V,2))))*pow(1-min(1,(sqrt(
pow(x-U,2)+pow(y-V,2))*.3)),2)+.9)#end#macro p(c)#if(c>1)#local l=mod(c,100
);g(2*div(l,10)-8,2*mod(l,10)-8)*p(div(c,100))#else 1#end#end light_source{
y 2}sphere{z*20 9pigment{function{p(26252423)*p(36455644)*p(66656463)}}}//M

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