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Subject: Radiosity... trials and tips???
Author: Steve Wilkinson • ( ---.dsl.sca.megapath.net )
Date: 03-08-03 03:08
This is a response to a little discussion that started off elsewhere burried in another thread. Since I've been hearing lots more of this from others as well, maybe anyone with some Radiosity experience.. or anyone struggling, could chime in, and we'll all learn something... PLEASE??? :o)
richard morley wrote:
>
> Well I could post my best image out of radiosity which is
> pretty aweful just to show you the poly problems I've been
> running into, if your interested. I haven't used the
> radiosity for about a month now because I got so frustrated.
> Would a radiosity user group help at all? I'm there if you
> think so.
>
> Richard Morley
Well, I was kind of joking about the user group... but on second thought, maybe just starting a thread right on that topic, and see what everyone has been experiencing and learned could probably benefit all of us.
Here is an image I've been working on...
http://www.cgwerks.com/test/rad_03b.jpg
At the far end of the room, is a window, with a light plane outside, which seems to be working for the most part. Also, in all the sections in the ceiling, there are 'can' lights, like the ones up close with the shading issues around them. Inside each of the 'cans' is a small polygon 'light'. I've got the outside light set at around 10 or 15, and they lights up in the 'cans' are set at over 1000 now... and I'm still getting very little light from them.
I can set the numbers higher for quality, bake time, etc. But the solution always finishes before the max time is out anyway... so it doesn't seem to be time/quality related, unless I'm doing something really wrong.
I've looked at 'The Toy' and other examples.. and I really can't seem to find that much different from how my scene is set up.
In the example projects, the 'light' planes are really huge... so does this mean that my small 'can' lights won't work, cause I need to have a huge area be the light? That would kind of limit any real world type setups.
Also, a real 'can' light would produce a spot on the floor, and then also, through bounce, light the rest of the scene.
Another thing I don't get, is that in real life, when a bright (or even not so bright) light comes in through a window, for example... if the light is bright enough to make a visible 'bright area' on a wall or the floor, the rest of the room, even in corners would be lit pretty well. I seem to be getting really intense light near the source, but little bounce, and little light if I get too far from the source. Real light, to me, does not drop off that quickly.
Also, as I noted in a previous thread. If I don't run a radiosity pass, and just throw a few normal lights in the scene, and render, all the shading is fine in most cases.
Any ideas, hints, tips???
Please share everyone.
Thank you,
-Steve
---
---------------------
Steve Wilkinson
http://www.cgWerks.com/
stevew@cgWerks.com
San Francisco
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