Xplo Eristotle wrote:
> 
> My intent was to make this an early morning scene. Unfortunately, while
> the sky works well for this, the lighting itself seems strongly
> reminiscent of late afternoon! (At least, to me and a lot of other
> people who've seen it.) I have no idea how to fix this; quick tests in
> Photoshop to add brighter/dimmer/cooler light only made the lighting
> look strange. I suppose I should be happy that the lighting is
> convincing enough to suggest *any* particular time of day, but I would
> be happier with the one that I was aiming for. ;)

I think the clouds look good, but a bit too red.  Some media could be good
for morning atmosphere too.

> A couple notes on radiosity settings: first, the only light_source is a
> "sun" placed well outside the room, and the count for this image was
> only 100. I achieved this level of smoothness with a high error_bound
> and a low low_error_factor (1 and .1, respectively). More testing is
> needed to determine if this method can replace typical low error_bound
> radiosity settings in other situations, unless someone's already done
> some and I missed it, but I'll let someone with a faster computer than
> mine do that testing!

Hmm, it looks really quite accurate for error_bound 1, but i am not sure
if it's a very good method. What recursion_limit did you use? Have you
tried varying pretrace_end?

> Second, judging from the color bleed on the floor,
> it appears that radiosity "bounces" off of reflective surfaces; is this
> true? 

Yes, somehow. Reflection is calculated for radiosity samples.

> Third, you can see the back of the room is full of artifacts; I
> don't know if this is because of poor lighting, or because the radiosity
> data in the reflected image is only a crude approximation.

I'm not sure, but such a scene seems a quite difficult setup for radiosity
in general.  How does it look with more conventional radiosity settings?

> I'll probably keep working on this; it would make a pretty cool scene
> with window glass, blinds, pictures on the walls, maybe a ceiling fan,
> and gods know what (a table, maybe?) in the middle, even if most of it
> would only be visible in the reflection. Okay, I'll shut up and let you
> see the pic now.. comments welcome as usual.
> 

It looks nice, my submission for the 10best cover image contest has a
similar configuration (but a bit different lighting) and i was forced to
use fairly low radiosity settings because it was that slow.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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