www.kraytracing.com

Hello,
I try to light a scene only with lumi polys, but the final renders always grainy.
What´s going wrong?





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General tab, turn on cache irradiance. this takes the FG settings in to account, other wise it generates noisy results (QMC render)

Cache irradiance is checked on...

Try this:

On the Quality tab, set the preset to Custom, then increase the values in the Rays Min & Max boxes next to Luminosity threshold. Try 200 & 500 for starters and then if you see an improvement, play with the figures until you're using the lowest values that give acceptable results.

Phil

Hi phile,
super, that´s helped the grain is away

double merci,
joschy

Quality tab, Luminosity model is now set to Auto with 100% I guess. For this type of large light sources , set it to "Compute as Indirect" OR set the Level to a % higher than your surface Lum % for the lumilight.
This is faster than using more lum samples if the scene is setup like I think it is.

Hello Erwin,
I will try it. Thank´s for the replay.

joschy

Yep, use indirect mode like Erwin said.

...the indirect solution looks not so nice as the automatic one.

Of course not. But it's twice as fast.

Indirect mode will blur shadows since it relies on interpolation between samples.
Direct mode will trace every pixel and so create a bit of noise.

Thank´s for the explanation. Kray rocks

WIP:





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