OTOY Forums

Hi, i would appreciate some advice from someone doing interior renders, flythroughs especially.
I am doing this kitchen, it's going to be a 3-5 min presentation, preferably in HD.

When i give any real power to the emitters, they start producing a lot of noise.
The image below reached 9000 samples in 30 minutes, and is still noisy.
Are such rendertimes to be expected with such a scene, or am i messing something up?
Could someone please look at the settings?

I have a gtx 460, I'm using directlight/diffuse with 2 bounces.

Bringing rendertimes down is crucial with this job, realism isn't a priority really.
If it can't be helped i will use Ambient Occlusion instead and make emitters very very weak.
I sure would like to keep some direct lighting though.

Any thoughts?

It is possible that octane spends too much computation at the large light in the middle. Since 2.56 you can improve this by setting the sampling_rate parameter of that emission to a value smaller than one.

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Roeland

roeland wrote:It is possible that octane spends too much computation at the large light in the middle. Since 2.56 you can improve this by setting the sampling_rate parameter of that emission to a value smaller than one.

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Roeland

Thanks Roeland! I will try it right away. I was using 2.52 for this.
Meanwhile i got closer to the look i wanted with Ambient Occlusion and some playing with the lights' efficiencies.
Took under 3 minutes to get to 2048 samples and a clean enough render.

There seems to be a big big diference in the way of interpreting efficiency values between 2.52 and 2.56.
Is the 2.56 way the way to go now or some kind of bug?

No, that is probably a bug. There shouldn't be such a difference. Can you send us this scene? (or a simpler variant that also has this problem)

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Roeland

I tried PM-ing you, but the message refuses to be sent.

Here's the scene.
http://www.sendspace.com/file/mk22xy

Thanks for looking into it. It was created in 2.52.
To easily reproduce the difference problem turn the environment off.

Value wise the new response seems more logical, but i find it hard to maintain the shadow under the top cabinet without blooming the highlight (of the small light) too much.

Also, even if i set tonemapping to the max, set efficiency and distribution to one and power to 100.000, I can't get the big light to light the room by itself in 2.56 (which might actually be the source of the shadow i'm trying to keep).

Good hunting ;]

This is a problem with emitters inside macro nodes in version 2.56. It will be fixed in our next test release in a few days.

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Roeland

roeland wrote:This is a problem with emitters inside macro nodes in version 2.56. It will be fixed in our next test release in a few days.

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Roeland

That explains it ;] Thanks!