How to clear up noise?

[mikelmnj]

Hello everyone,

I'm in a bit of a jam with Octane at the moment--I have a project I brought into Octane, an interiour. There's no deadline or rush, just exploring Octane. I'm having a lot of trouble clearing up noise. I would like to continue using Octane and I've seen fantastic work by other users who have done interiours. Would you all mind sharing how you circumvented any noise issues?

Thanks!

[Refracty]

Solutions are: no small emitters, less glossy materials, open walls and so on
best thing would be if you could show your scene and noise problem so we could give specific tips

[FrankPooleFloating]

Don't forget to use Portals on windows/open doors, as suggested in The Manual.

Sometimes a specular object can be introducing noise.. even a little one.. check that too.

Do not put an emitter inside of a recessed light (tube in ceiling).. I made that mistake
early on. Put an emitter at same plane as ceiling.

I would highly suggest making a test interior scene - that is as simple as you can
make it - with a window or two, a couch, a table.. use daylight system with some
sunlight coming in and now start playing with emitters in the room. Then
add objects one at a time - which may very well give quick insight into what is
causing what. This is what I did when I was getting a ton of noise while first using
Octane.. and this got me up and running much, much faster than I would have been
otherwise. Think about it - if you are new to Octane and load up a crazy indoor scene
with tons of furniture etc - and light coming from every-whicha-way - you are likely
just jumping from one setting to another trying desperately to figure out what in hell
is making stuff look like poo...

Baby steps bro.

[jmfowler]

use PMC. no pure white material colours. bump maps on glossy materials can create noise on their surface. use caustic blur. render at 8000 samples. let the light bounce 8 times.

[mikelmnj]

Thank you for the replies.

I see a few things here I haven't tried yet, so I will be doing so now--thank you again. My emitters may be doing it, but overall I think my whole scene is just too complex to render in one go--cutting apart the rooms and opening walls to allow more light in may very well do the trick. The scene/renders are actually in the WIP section here: http://render.otoy.com/forum/viewtopic.php?f=6&t=27790

Feeling a bit more confident now that I have a new direction for my workflow with Octane. Let's see how it goes!

Thanks again,

Mikel

[Erick]

Don't forget to use Portals on windows/open doors, as suggested in The Manual.

Ah, so that means, instead of using an actual glass material for a window, one should set the window (resp. the glass part of it) to portal?
I never thought of this, thanks for the tip.

[RickToxik]

If you render with an HDRI lighting, the texture gamma must be set to 1.

[rappet]

Render in high resolution and reduce noise afterwards in postproduction and/or downscale image will help too.
Greetz,