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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