How to make ACES color space work?

[kostache]

Hello,

could anybody explain me how to make ACES color space work in latest Octane for MODO? Where to take a proper config.ocio file? If I set my ones (v1.2 or v2.0 - they're taken from here: https://github.com/colour-science/OpenColorIO-Configs/) in MODO Preference for Octane I still couldn't choose available in menu ACES2065-1 or ACEScg as my Color Space preset for EXR saving option. There is also no any ACES presets for "OCIO view" and "OCIO look" in Imager tab. It will be great if someone could write step by step tutorial how to do that.

Thanks in advance

Konstantin

[face_off]

Hi Konstantin

This is a known issue, which I am waiting to hear back from OTOY on.

Thanks

Paul

[funk]

To see ACES working in the viewport:

1. Stop the render if its in progress
2. Go to system > preferences > rendering > octane and set the OCIO config filename to "C:\YOURPATH\OpenColorIO-Configs-feature-aces-1.2-config\aces_1.2\config.ocio"
NOTE: Make sure "Automatic intermediate color space" is enabled.
If you are using an older build that doesnt have this, set Intermediate color space OCTANE = "ACES2065-1" and OCIO = "ACES - ACES2065-1"
3. Set Camera > imager > OCIO VIew to "ACES: sRGB"
4. Start your render

Saving out ACEScg EXRs doesnt work correctly at the moment (which is what Paul is talking about in his reply), but will be fixed in newer builds.

[kostache]

Hello Funk and thanks!

I just tried to follow your steps in case to make ACES work, but failed:

I have a MODO 14.2v2 and latest Octane build installed (2020.2.3.171). My render is hanging at the first sample if I going to use OCIO view with "ACES:sRGB" or any other from the long list there, except "none:sRGB". Right after I set it back to "none:sRGB" everything is run smoothly.

Konstantin

[kostache]

Hello Everybody,

an update - I tried to render with ACES 2065-1 color space as intermediate one (without any OCIO view option enabled, because of render hanging) and my render performance was decreased on 30% in comparison with regular render. My test time was 5.11 for normal render and 7.32 when I used config.ocio with ACES 2065-1 color space. Saving to .exr with ACEScg preset is working well, but result is unpredictable, because there is no chance to observe any changes on the screen so far (ACES to sRGB preview is hanging). I read, that OCIO v2 will bring faster color conversion speed, but I didn't find any workable OCIO v2 configs yet. Could anybody test same things on his own system and write a feedback?

Thanks in advance

Konstantin

[funk]

Hello Funk and thanks!

I just tried to follow your steps in case to make ACES work, but failed:

I have a MODO 14.2v2 and latest Octane build installed (2020.2.3.171). My render is hanging at the first sample if I going to use OCIO view with "ACES:sRGB" or any other from the long list there, except "none:sRGB". Right after I set it back to "none:sRGB" everything is run smoothly.

When this happens, open the octane log window and see if there are any errors

[kostache]

Hello Funk,

yes, I've got some errors:
device 0: Failed to build OCIO LUT: OCIO error: The specified file reference 'Log2_48_nits_Shaper_to_linear.spi1d' could not be located. The following attempts were made: B:\Common\Libraries\Material\OCIO\luts\Log2_48_nits_Shaper_to_linear.spi1d
device 1: Failed to build OCIO LUT: OCIO error: The specified file reference 'Log2_48_nits_Shaper_to_linear.spi1d' could not be located. The following attempts were made: B:\Common\Libraries\Material\OCIO\luts\Log2_48_nits_Shaper_to_linear.spi1d
device 1: Failed to build OCIO LUT: OCIO error: The specified file reference 'Log2_48_nits_Shaper_to_linear.spi1d' could not be located. The following attempts were made: B:\Common\Libraries\Material\OCIO\luts\Log2_48_nits_Shaper_to_linear.spi1d
device 0: Failed to build OCIO LUT: OCIO error: The specified file reference 'Log2_48_nits_Shaper_to_linear.spi1d' could not be located. The following attempts were made: B:\Common\Libraries\Material\OCIO\luts\Log2_48_nits_Shaper_to_linear.spi1d
device 1: Failed to build OCIO LUT: OCIO error: The specified file reference 'Log2_48_nits_Shaper_to_linear.spi1d' could not be located. The following attempts were made: B:\Common\Libraries\Material\OCIO\luts\Log2_48_nits_Shaper_to_linear.spi1d
device 1: Failed to build OCIO LUT: OCIO error: The specified file reference 'Log2_48_nits_Shaper_to_linear.spi1d' could not be located. The following attempts were made: B:\Common\Libraries\Material\OCIO\luts\Log2_48_nits_Shaper_to_linear.spi1d
device 0: Failed to build OCIO LUT: OCIO error: The specified file reference 'Log2_48_nits_Shaper_to_linear.spi1d' could not be located. The following attempts were made: B:\Common\Libraries\Material\OCIO\luts\Log2_48_nits_Shaper_to_linear.spi1d

Konstantin

[funk]

Have you actually extracted the zip to "B"? It looks like you're missing files from the ACES download.

Make sure you download the release zip file and extract it correctly (keeping the folder structure).
https://github.com/colour-science/OpenC ... s/releases

You need OpenColorIO-Config-ACES-1.2.zip
https://github.com/colour-science/OpenC ... ES-1.2.zip

[kostache]

I found a reason - some file's access restriction.
Thanks Funk!

Konstantin

[Hesekiel2517]

Hey there, i really like the look of the aces view in octane. Saving images as exr also works great, but when i try to save to png the colors are always wrong. How can I save the image to png?