"Xplo Eristotle" <inq### [at] unforgettablecom> wrote in message
news:3BFF76A6.F83284F6@unforgettable.com...
>
> 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. ;)

Yellower sunlight for morning, yellow-orange for late afternoon pre-evening.
That's my thinking on it.  And of course both can actually be quite
orange-red too if the sun is at horizon.  The colors of sunlight is a rather
important thing to consider.

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

You're probably forgetting about using higher max_trace_level.  I've used
error_bound 1 before and thought it did well depending on the scene.
The back wall isn't what distracts me, it's the edges of wall and floor.

bob h

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