See image posted in p.b.i.  Uses looks like sphere with ambient set to 1000,
max_trace_leve = 1000, six lenses (12 reflect/refract surfaces) with fresnel
reflection (max set to 1/3 to minimize scene reflection). It's not as pretty
as fake ones, but that's not what I was trying to achieve.  BTW, the viewing
angle here was only 2.5 degrees, orthographic can probably be used as well
and is maybe the better choice.

-tgq


"Ron Parker" <ron### [at] povrayorg> wrote in message
news:slr### [at] fwicom...
> On Wed, 07 Nov 2001 23:23:35 +0200, Peter Popov wrote:
> > On 7 Nov 2001 08:15:58 -0500, Ron Parker <ron### [at] povrayorg>
> > wrote:
> >
> >>Not that I remember.
> >
> > OK, I'll have to check who it was, then.
> >
> >>But it really doesn't require photons, so it's possible Dan was playing
> >>with it that long ago.
> >
> > How so? Lens flares usually originate from light sources.
>
> True, but since the path is ES*L, it is sufficient to give the light
source a
> looks_like that has sufficient brightness to survive multiple reflections.
> Photons are only useful when the path is ES*DS*L.
>
> To get some of the more interesting flares requires blurred reflection
and/or
> refraction, and perhaps a touch of dispersion.  Slow, slow, slow.
>
> --
> #macro R(P)z+_(P)_(P)_(P+1)_(P+1)+z#end#macro Q(C,T)bicubic_patch{type
1u_steps
> 6v_steps 6R(1)R(3)R(5)R(7)pigment{rgb z}}#end#macro _(Y)#local
X=asc(substr(C,Y
> ,1))-65;<T+mod(X,4)div(X,4)9>-2#end#macro
O(T)Q("ABEFUQWS",T)Q("WSXTLOJN",T)#
> end O(0)O(3)Q("JNKLCGCD",0)light_source{x 1}// ron### [at] povrayorg

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