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Getting rid of noisy render

fred9803fred9803 Posts: 1,564
edited February 2021 in Technical Help (nuts n bolts)

Up to now I've been able to eliminate or reduce noise one way or another on my renders, but the scene I'm working on now is a real [pain]. I've pumped up render quality setting to 4 but it finishes still very noisy, even though it's relatively well lit. De-noising filter is worthless and ends up looking like a cartoon.

Can someone please tell me what settings I can adjust to get that noise out. I know it probably involves letting it render for a much longer time, but what else in the render settings can I fiddle with?

I'm using a RTX2080 which usually does a decent job, but this one has got me stuck.

Post edited by Richard Haseltine on

Comments

  • prixatprixat Posts: 1,590

    That's not how I use the quality setting.enlightened

    If I'm rendering a mountain range and really need to see that blade of grass on the third mountain back then I'd turn up the quality. Otherwise it just slows everything down to a crawl and maybe even adds to the noise.

  • fred9803fred9803 Posts: 1,564
    edited February 2021

    Thanks prixat. I feel a bit stupid because I've been using DS for some time now and I should know about adjusting the render settings better than I do. What do you suggest I should alter in the settings to get rid of this noise? I'm prepared to wait about an hour or so, maybe an hour and a half, to render this scene which is much longer than usual. I've never been very patient.

    Edit - the scene is in a railway carriage with an HDRI and a ghost light outside the window. The ghost light is a bit strong and there's over-exposure clipping on parts directly in direct line with it, and the bits shaded from it are the bits that have the noise problem. I might have to turn that light down and somehow get more ambient lighting into the scene.... perhaps more HDRI enviromnent intensity. I've already got tone-mapping exposure values set dangeriously high trying to get some light into the damn scene.

    Post edited by fred9803 on
  • PerttiAPerttiA Posts: 10,024

    If you get noise, it means you haven't rendered long enough.

    If Max time and max samples are too low, the render stops even when the result is not nearly good enough.

  • Richard HaseltineRichard Haseltine Posts: 102,260

    If it's a largely closed space lit from outside then you are relying on bounced light to reach many areas, and that is always going to eb relatively slow. You might try guessing where the light will principally bounce and adding some (fairly dim for the overall levels) ghost lights there to give a boost.

  • fred9803fred9803 Posts: 1,564

    Thanks everyone. I'll test with some different render settings.

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