OTOY Forums

Posted: **Wed Dec 10, 2025 6:57 pm**

I can't seem to figure out how to use a custom ocio config so I can enable the AGX in the ipr (Houdini 21, Octane 2025.4). Has anybody got any idea to enable this/ get this working? (I can only seem to find the LUT input, not a OCIO config.) Thanks!!!

I've also looked online at c4d or blender setups but haven't found a solution/ comparable setting and options in the Houdini UI that allow me to load a config in unfortunately. (Diving into Skientia files: https://gaussianspectrum.co/octanerender/aces , I also don't share the option to load a custom config like in the standalone version.)

Posted: **Wed Dec 10, 2025 11:15 pm**

Hey there!
Not too difficult to get working.

You can do this by setting an OCIO variable either in the houdini.env or as a json file.
This is what I have done:
Make a new json file in the houdini21.0/packages folder.
Then call it ocio.json.
Inside put:

Code: Select all

{
  "enable" : true,
  "show" : true,
  "load_package_once" : true,
  "env": [
	{"OCIO" : "${path/to/ocio/config}"}
  ]
}

Now you also need to download a agx ocio config.
This should work:
https://github.com/sobotka/AgX/tree/main
Download and unzip the whole repo anywhere you want (I have mine at c:/OCIO) (you need both the config file and the luts folder in there).
Then replace the path/to/config with the path of that folder (make sure to use /or \\ as single \ will NOT work).

With that inplace you should be able to restart houdini and see your agx tonemapping options under the tonemapping tab of the octane render target/render setup.

OTOY Forums

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