OctaneRender® 2023.1 Alpha 1 Tweet

[J.C]

Can somebody explain why there are two BRDF options in Glossy and Universal material node and how to use it?

One is for the "diffuse" reflection,
the other the "specular" reflection.

Lambertian vs Oren Nayar (vs Octane's own model) differences can be found on an other release note post or online.

So the "Oren Nayar" is now a default mode for diffuse surfaces?
If I want previous behaviour Should I use "Octane"?

[elsksa]

So the "Oren Nayar" is now a default mode for diffuse surfaces?
If I want previous behaviour Should I use "Octane"?

"Whatever floats your boat". It's only noticeable when Diffuse Roughness value is higher than 0.

There aren't any obligations for the diffuse BRDF, unlike the Specular Reflection "BRDF" where GGX Energy Preserving is strongly recommended, for the reasons explicitly mentioned in its name. However, Oren-Nayar model has a noticeable "energy loss" compared to the two others, but as its impact is not as significant as (rough) Specular Reflection, it is less relevant and its "rendition/look" makes it a viable compromise of the three.

Link to the build release notes:

[john_otoy]

Enabling "Fog environment contribution" results in funky image.

Render target.png

Can you provide a simplified scene? You can replace the car with a cube, as long as the problem still happens.

[J.C]

Enabling "Fog environment contribution" results in funky image.

Render target.png

Can you provide a simplified scene? You can replace the car with a cube, as long as the problem still happens.

I've sent PM as you asked.

[J.C]

So the "Oren Nayar" is now a default mode for diffuse surfaces?
If I want previous behaviour Should I use "Octane"?

"Whatever floats your boat".

Thanks for detailed explanation. I already knew about those BRDF differences. My only concern was BRDF modes were not present for Diffuse (but only for reflection) in 2022 builds so I wondered what settings should I keep to have same look as before.

[hypeng]

Please explain how to use this setting, it should give the effect of the rays of light sources, but nothing like this happens, I would be glad if you tell me what I do wrong, thank you

Hi there,

You will need to create an analytic/directional light in the scene and toggle on the `User in post volume` bool pin for it to show up in the post volume pass.

[nuno1980]

I request you will increase the number of samples per pixel from 1M to 100M for any region picked (and/or for full image) and add the "Max. samples for region picked:" for kernel settings due to the very good/excellent (variable and fixed) caustics at Path Tracing in next version of 2023.

[bullet0830bs]

Do you have any plans to release the Cinema4d version?

[linograndiotoy]

I've created a very simple scene showing what Analytic lights are helping with.

You can clearly see the benefits on direct diffuse and Specular rays. Not to mention the noiseless, super fast volumetric lighting.

Just turn on/off Analytic spread slution for the light to see the difference.

Analytic spread slution off:

Analytic spread slution on:

Analytic_Light.ocs

(97.51 KiB) Downloaded 66 times

[rohandalvi]

Can we please get Instance Attributes. It's one of the major things missing in Octane.