"Alf Peake" <alf### [at] peake42freeservecouk> wrote in 
news:3d3c202c@news.povray.org

> Nice pic, but I would like to see something through the lens?

yes - it's my problem with it - can it be a bug ? 
pigment is color rgbf <.93,.95,.99,.98>
and if ther is nodispersion - it looks like glass
after adding dispersion - glass is very 'dark' and non-transparent. After 
adding dispersion I had to add ambinet 2.5 (!) to have sam brightness as 
with no dispersion and ambient 0.0

>> How we can see some photons artefacts are in middle-botom of image.
>> Maybe just adding jitter instead of increasing spacing will help ?
> Someone posted a similar problem a little while ago, and it was
> suggested the light source was too close. Moved further away and
> problem solved.

not in this case - light is in <-20,45,-30>*100
while scene (magnifying glass) is about 40x40x40


-- 
#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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