Hi dreif and J.C,
Thanks for your reports and sorry for the inconvenience.
In current blender builds(16.3.x and 17.x), we fixed a legacy bug in mix material which has been there for years.
Basically previous builds inverted the order of mix material inputs and now the order is correct.
In the next build, we will fix the backward compatibility bugs so you don't have to change your scenes manually.
If you want a quick patch in current builds, here I wrote some script to help you invert the inputs automatically. It works fine in the tests. Please let me know if you have any questions. Thanks!
1. Close OctaneBlender
2. Download, uncompress and replace your "compatibility.py" under "[OctaneBlender Folder]\2.79\scripts\addons\octane", e.g. for me it's "D:\OTOY\softwares\BlenderOctane17.1\2.79\scripts\addons\octane".
- For Mac, it is put under "[blender.app folder]/Contents/Resources/2.79/scripts/addons/octane".
3. BACKUP your scene file
4. Open your scene with OctaneBlender. Now the order of mix material inputs should be inverted.
Please let me know if you have any questions. Thanks!
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