OctaneRender™ 2020.1 RC1 [superseded by 2020.1 RC2]

[funk]

I had a look into this and it seems like it's a general path tracing problem, it's not really good at tracing indirect rays and hitting the sun.

Thanks for looking into it. Too bad... Hopefully it's something you guys can look into some day? Not sure if its possible, but maybe something like a "GI Clamp" for refractions?

I noticed even the denoiser doesn't handle it well. Would more training with scenes like this help?

[wallace]

I had a look into this and it seems like it's a general path tracing problem, it's not really good at tracing indirect rays and hitting the sun.

Thanks for looking into it. Too bad... Hopefully it's something you guys can look into some day? Not sure if its possible, but maybe something like a "GI Clamp" for refractions?

I noticed even the denoiser doesn't handle it well. Would more training with scenes like this help?

GI clamp does work on all indirect rays, so that includes refraction.

The problem here is that the sun is bright white, while the majority would hit the blue skin and occasionally hitting the white sun, that contrast would create fireflies pretty easily even with your lowered 10.0 GI clamp.

To show GI clamp does work on refraction rays, you can further lower it to 1.0 and use the denoiser to see the difference, I have attached an image of what difference it would make. (I'm not advocating for the user of 1.0 GI clamp here but I'm just showing that you can tweak it a bit more to lower the the variance of the input to the denoiser until you get a more desirable result).

[funk]

To show GI clamp does work on refraction rays, you can further lower it to 1.0 and use the denoiser to see the difference, I have attached an image of what difference it would make. (I'm not advocating for the user of 1.0 GI clamp here but I'm just showing that you can tweak it a bit more to lower the the variance of the input to the denoiser until you get a more desirable result).

You seem to have edited the scene in other ways though... (possibly using a different internal build too?)

I'm not getting the same results with gi clamp of 1.0 and denoising, even at 100k samples.

EDIT: See my next post for more info and tests in 2019.1.5

[BorisGoreta]

Dirt node is immediately crashing render slave which has 4 "normal" GPUs and 1 RTX GPU.
Is there a way to disable RTX on render slaves ?

[funk]

Wallace, there is definitely something wrong with 2020.1 RC1. I tried this in 2019.1.5. I adjusted the glass material so it has 0.01 roughness (which helps a lot), while using gi clamp of 1.0.

In 2019.1.5 I start seeing a clean result pretty quickly. In 2020.1 RC1, the noise doesnt cleans up.
NOTE: As far as I can tell, testing this scene in 2019.1.5, GI clamp doesnt work if the material roughness is set to 0. So I'm thinking GI clamp isnt working at all in 2020.1 RC1, even when roughness is 0.01

I have attached the edited scene (I saved it from 2019 this time), and rendered in both 2019/2020

I'm not quite sure why the render stats/time looks so different between 2019 and 2020 in my screenshot.

When you look at this again, after fixing the 2020 RC1 issue, can you look into why GI clamp doesnt work at all when roughness is 0?

[noldo]

Are you using visible environment?
In 2020.1.x importance sampling on visible environment seems broken (bug?)

[funk]

Are you using visible environment?

No

[divasoft]

Hi guys, i found weird glass behavior. I can't see fog volume through lens glass. It's a bug or limitation? it will be fixed in future releases?

[mojave]

Dirt node is immediately crashing render slave which has 4 "normal" GPUs and 1 RTX GPU.
Is there a way to disable RTX on render slaves ?

Thank you for reporting this, we will look into it.

Regarding to your question, same as with other device settings this can be configured using the standalone device settings dialog but also specifying disableRtxin your octane_log_flags.txt file.

[BorisGoreta]

Could you please tell me how exactly do I disable RTX on the node ?

Firstly I don't have standalone installed on it, only the slave. Secondly I don't know where to find the octane_log_flags.txt file.

Thanks !