Need a little help with lumi polys

[joschy3d]

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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[Pheidian]

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

[joschy3d]

Cache irradiance is checked on...

[phile_forum]

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

[joschy3d]

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

double merci,
joschy

[erwin zwart]

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.

[joschy3d]

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

joschy

[jure]

Yep, use indirect mode like Erwin said.

[joschy3d]

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

[jure]

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.

[joschy3d]

Thank´s for the explanation. Kray rocks

WIP:





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