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"Bruno Cabasson" <bru### [at] alcatelaleniaspace fr> wrote:
>
> Try this code. It is some kind of nebula, which is more accurate for comparison
> between renders than simple spheres...
> PS: I just hope that I am not mislead by something so obvious I can't see it!
Sorry I haven't been timely with my comments; I got kind of 'stuck' while
testing out this version of your nebula code--specifically the version with the
light_groups, the example using just the spheres again. I ran across a
light_group problem that I haven't been able to understand or work around.
Given that your light_group code, as-is, has two groups of spheres, each group
in its OWN light_group (and each with its own light): If I comment-out the
light_group container for the UnionSpheres group...while retaining its light..
suddenly *those* spheres appear to be lit by BOTH lights! Yet the
DistinctSpheres group does not (which is correct behavior.) I don't understand
why the light in the DistinctSpheres light_group is now illuminating BOTH
groups of spheres. Aarrgghh, now I'm hoping that *I* am not being mislead by
something obvious! :-) Looks like some kind of problem with lights_groups...to
add to the scattering media problems!
BTW, I haven't yet said how much I like your nebula(s). Nice work! I've even
learned a few things; thanks!
Ken W.
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Le Sun, 08 Jun 2008 06:40:10 +0200, Kenneth <kdw### [at] earthlink net> a
> "Bruno Cabasson" <bru### [at] alcatelaleniaspace fr> wrote:
>
>>
>> Try this code. It is some kind of nebula, which is more accurate for
>> comparison
>> between renders than simple spheres...
>> PS: I just hope that I am not mislead by something so obvious I can't
>> see it!
>
> Sorry I haven't been timely with my comments; I got kind of 'stuck' while
> testing out this version of your nebula code--specifically the version
> with the
> light_groups, the example using just the spheres again. I ran across a
> light_group problem that I haven't been able to understand or work
> around.
>
> Given that your light_group code, as-is, has two groups of spheres, each
> group
> in its OWN light_group (and each with its own light): If I comment-out
> the
> light_group container for the UnionSpheres group...while retaining its
> light..
> suddenly *those* spheres appear to be lit by BOTH lights! Yet the
> DistinctSpheres group does not (which is correct behavior.) I don't
> understand
> why the light in the DistinctSpheres light_group is now illuminating BOTH
> groups of spheres. Aarrgghh, now I'm hoping that *I* am not being
> mislead by
> something obvious! :-) Looks like some kind of problem with
> lights_groups...to
> add to the scattering media problems!
>
> BTW, I haven't yet said how much I like your nebula(s). Nice work! I've
> even
> learned a few things; thanks!
>
> Ken W.
>
>
>
Thanks for you attention, Kenneth. Me neither, I had not much time these
days to dig more on the subjet. I hope I have more time this week-end to
meditate on it. I'll have a try at the light_group concern you mention.
Bruno.
--
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