"Thorsten Froehlich" <tho### [at] trfde> wrote in
news:3d60959d@news.povray.org 

>> Some older scenes, especialy using lens flares [1] macros need AFAIR
>> mex_trace_level of 500 ... 3000
> No, you not only not needed it, but you could not have used it either.
>  If you had needed such a max_trace_level there would have been a hard
> crash of POV-Ray long before you had reached it.

are You shure ?

I ques that You are talking about i.e. glas - where each ray needs to next 
rays (reflected and refracted) and that in 256 levels leads to 2^256 rays 
with shurely will crash pov.

but imagine
1. solid mirror (no filter)
2. only filter (like lans flare)

and Im 100% shure that levels >256 are needed - some scenes with flares 
rendered incorecctly at level < 500 (they contained black spots), and 
author alsow informed in documentation that max_trace_level >1000 is needed


-- 
#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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