CGTalk - Radiosity & Animation (again?)

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Pate

10-18-2002, 05:02 AM

Hi!

This is probably a FAQ, but even after following with interest the recent radiosity threads and following MJV's excellent tutorials I have not been able to find good settings for animation with radiosity when the lighting changes.

I can create good-looking still images with reasonable render times, but what is the best way to get rid of the flickering/uneven/random patches caused by radiosity in animation when the camera is stationary and the only thing moving is the main light source?

I assume "single animation solution" and/or baking radiosity into materials solves the problem when the camera moves and the lighting stays constant, but what about when the lighting is the changing factor, any tricks I can use then? Upping all parameters to huge values might work, but I'd like the animation to render some time this century..

I have not yet exhausted all my ideas and still have parameters left to tinker with, I just thought you guys might know some tricks I have not thought of...

I am actually still modeling my scene, I just started experimenting with radiosity so that I don't get bored with modeling (which I have already done for about 2 months for this simple scene, and still have a way to go)...

Thanks!

Pate

Per-Anders

10-18-2002, 05:58 AM

as far as i'm aware there's no real way to deal with that apart from upping the samples a hell of a lot, and making the radiosity use the stochastic rather than the montecarlo method. is the light actually moving or is it just getting brighter or dimming? if that's the case then you're better off baking the solution and actually blending the textures between the different lighting situations.

one other thing you can do is bake the scene without any lights or with just a low level ambient lighting situation to get the general radiosity bleed effect, and then don't use radiosity at all to move your lights around.

STRAT

10-18-2002, 07:51 AM

there is only 2 real methods of getting pleasing results - either use 100% accuracy with a shit load of samples (and i mean a shit load) or use stotchastic mode.

i've researched this topic extensively with maxon themselves and done numerous tests and stotchastic mode is really the only method to elliminate flickering completely.

Pate

10-18-2002, 02:44 PM

Thanks guys!

Looks like I'll follow the "fake it" route, as I believe I can get a reasonably good effect with a fraction of the render time by using a few strategically placed omni lights instead of real radiosity.

The main light source is moving, actually rotating around the scene. I am thinking of using COFFEE (or XPresso when my R8 arrives) to adjust the "ambient" omni lights (or perhaps spotlights) based on the direction of the main lights source, I think it should work..

Thanks again!

Pate

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