Which render mode for indoor scenes?

[zeitmeister]

Hi,

I wondered which render mode do you prefer on rendering indoor scenes with sunsky indirect lighting and exit portals.
Recently I rendered a scene with MLT Bi-Dir and super sampling of 4, and even after three days some parts still remained crispy.

Now I'm gonna try path tracing with BiDir … it remains to be exciting.

By the way:
In which mode does the new glass acceleration options work better, or is being regarded at all?


Thank you for your suggestions!

[Zom-B]

Recently I rendered a scene with MLT Bi-Dir and super sampling of 4, and even after three days some parts still remained crispy.

There are quite some MLT Parameters tweakable!
Raising the Larg Mutation prob. to 0.5 and reducing the Max Change to 0.005 will result in a better chance for Indigo to render a "big patch of rays in a critical area" and with reduced Max Change this area wont be left so quickly.

Now I'm gonna try path tracing with BiDir … it remains to be exciting.

In some scenarios BiDir may not be needed, and even slowing rendering down...

In which mode does the new glass acceleration options work better, or is being regarded at all?

At the moment glass aceleration only works with BiDir mode (PT & MLT)


Please post your results after you did both renderings!

[zeitmeister]

PT indeed seems to take way longer to get noisefree.
I am currently rendering the scene with you recommended settings and MLT; tomorrow I will post the comparison.
Thank you very much for your suggestions!

[zeitmeister]

MLT is really quicker; by far.
Let's hope that your hints work for my scene … but I'm very optimistic, regarding your skills.

[Zom-B]

MLT is really quicker; by far.
Let's hope that your hints work for my scene …

Yes PT can suck on special situations, but I'm sure Glare is interested in optimizing it since the future GPU version will be PT only atm as far as we know.

but I'm very optimistic, regarding your skills.

I'm more a "smart-ass" then a "source of knowledge", so I'm crossing fingers
But my recommendations are based on example renderings from CoolColJ in his experimental thread, I use them most of the time too!

[dcm]

hmm dudes you know im doing interiors only and i was using MLT always. But now im PT all the time. Reasons :

MLT is cleaning image faster at start but when you are rendering 6+ hours, mlt stuck and noise is dissapearing veeeeeeeeery slowly, sometimes you can feel that noise isnt dissapearing at all.
MLT is fine when you want to use AD and a lot of spotligts - faster preview at start
MLT is doing less fireflies but they are still there
MLT is doinng blotchy noise in dark areas.

PT long distance runner for me. Slower at start but after 20hours you can still see activity in rendering process and noise removal. Its more "linear" = more time = cleaner image. Using ss4 will remove flies a bit but in indoor scenes you can have flies only from small spotlights or difficult emitter meshes. I can clean my interion up to 6 hours in medium size using exitportals and pt bidir. Important are materials and rgb values too.

So i think that its not true that mlt is faster. Its faster at start but as i wrote, with PT you can be sure that will remove smallest noise at the end of rendering too!

[zeitmeister]

Hm,

this is quite corresponding to what I experience here.
Nethertheless, I will let it cook overnight with MLT BiDir … after that, I'll give it another try with PT BiDir.

Thank you for your suggestions … I will post the tests here.

[zeitmeister]

Modifying both the Large Mutation Prob. and Max Change helped a lot with MLT.
After rendering 14 hours on 3 machines, MLT is indeed still noisy.
I now started the PT rendering again … hopefully with the same rendertime.

[Zom-B]

Modifying both the Large Mutation Prob. and Max Change helped a lot with MLT.

I'm glad to hear that!

After rendering 14 hours on 3 machines, MLT is indeed still noisy.

Since I'm a PT cripple it is no option for me to do pure PT ;(
Anyway that MLT can keep Noise for a long time is something I "discovered" too. In my Pipeline denoising is always a necessary procedure... a sad fact!

[zeitmeister]

Yeah; denoising is absolutely necessary.
I checked out NoiseNinja and think of buying it … what plugin or appication do you guys prefer?

[Zom-B]

I bought NeatVideo for AE to have a good temporal denoiser for animations too. It works same as NeatImage for single Frames and I'm very happy with the results!
But denoising a XL print render in 32bit mode eats RAM like a champ, so I denoise in 16bit most of the time.

[dcm]

NeatImage rocks, Topaz DeNoise is good too! Try that...

[zeitmeister]

NeatImage rocks indeed!
Sad that the trial offers just a small area of denoising … I'll have a look at Topaz.

[Pibuz]

Hey Zeit! These tests sound to be useful for the whole community! Since I read you're actualy DOING testrenders on the same scene, would you mind posting the "final" images for a comparison? Thank you very much!

..learning of the indoor qualities of PT is such a discover for me: I'm quite intrigued now
Thank you dcm!

[zeitmeister]

Hi all,

due to some sickness I'll post the renders later … I have to stay away from work for a while.
So I hope I can post the renders at the end of this week.

Sorry for the delay!