Extreme PBR, blender add-on that provides huge numbers materials and set them up quickly, is nice add-on but it does not care of Octane naturally.
Then I tried to write which could convert Extreme PBR to Octane's material.
There are some difficulty to make them equivalent to the EEVEE's result and too much materials to check all of them, I already feel some issues for this, the most of them seem that get closer to EEVEE's.
- 'water' is not supported for now. need further more works.
- some like of 'metal walkaway' that have transparency are seemed to have to be adjusted.
- if the converter found unknown node for it, then stops silently. no warnings, no errors presents.
So let me show you this and I'd like to ask some opinions.
But this is NO WARRANTY, DO NOT TRY AT YOUR IMPORTANT DATA.
https://github.com/roentgen/PBR_material_converter
Please "Download Zip" and install it.
- download zip from "Code" green box
Set your object up by Extreme PBR, then change renderer engine to 'Octane', and try it.
'Create New Material' is recommended to try it, because converter keeps your material immutable.
- there is the panel on Material section
best,