buckets behaviour

[Anonymous]

Hi, since the 7.0 update, the buckets appear in a strange way:

- They aren't all visible. Please see the attached image of the render-window, while doing the "production render" (not IPR). The Pc has 20 cores, but only from 1 to 3 buckets appear, quite randomly for a while.

- All the hundreds buckets of the image flash "white" simultaneously and frequently. Also the unrendered ones. (checked: all imagers disabled)

Is this a normal behaviour or not?

[CiroCardoso3v]

Do you have imagers applied?

[Anonymous]

I tried the imagers/denoisers: the behaviour described above happens only with OPTIX enabled.

While testing this... I noted that with OIDN and NOICE, it looks this way:

So.. until the 80-90% of the render process, the buckets still black.
After this, I can see appearing the image in the last 10-20% of the render process.
The render buckets don't appear one by one, but...

• in 2 , 3 refreshes/passes with OIDN enabled;
• in more frequent passes with NOICE enabled;
  
  Maybe related to the denoisers issue that operate in production render like it's a IPR session?

[CiroCardoso3v]

Yes that happens with Optix, OIDN and Noice, because in the background Arnold is applying the denoise. I believe it needs some neighbor tiles in order to do the math, so they are black while doing that.

[Anonymous]

yea, but it's strange to see for the 90% of the render time a black screen 🙂

In long computation time (like huge/complex images) it's a problem. (example: it is useful for me to check while rendering, if there are some wrong parts in the image, so I can work on another pc to fix them)

I think that this "falls" in the issue that there's no need to have realtime denoise when rendering the "final production" image.

[CiroCardoso3v]

You are right yes. I think is a double edge sword. Because while in IPR mode, you want to see the denoise being applied while is rendering in progressive mode. But then in final render mode, you want that noise to be applied after the render finishes.

I believe they working on that, as you aren't the only one "complaining" about it. Are you rendering an animation? Because you can still apply the denoise at the end manually with Noice and OIDN.

[Anonymous]

I agree with you: the "double edge sword" well explains this 🙂

Yes I'm on an animation .. and doing the noice using the denoising aovs 😕

[thiago.ize]

I think what is happening is that it is black because the imager takes a while to run. The higher res the image is the longer it'll take. Also, OIDN will only run on one core during the middle of rendering so that your render isn not too slowed down by the always running imager. So it would not surprise me if you don't see updates for 20s or so. But, for long running renders waiting 20s to see what's been rendered should not be too painful?

Also, keep in mind arnold cannot show anything until a bucket has completed: imager or no imager. For that you can try smaller buckets.