Even with the latest Version 21.11 linking / appending of objects / materials with
mix shader nodes don't work correctly.

I recently upgradet from Version 3 to 4 and encountered some bugs:

1. When appending / linking a Material / Object from a Blendfile created in previous Version (3.07) the Material Inputs of the Mix Material gets swapped, which makes the Material look wrong.

2. When "Node Graph Upload Optimization ...

For you to try out just the Render Layer with alpha channel Export and a Version with a different background.
I'm still on Octane Blender Version 3.07. So maybe it is a Problem with newer Versions or just some setting problems in Photoshop...

I don't know why you get these strange results. I've even tried you're Blend File.
Here my results rendered in Blender Plug-In with the Settings mentioned in my post.
Suzanne with and without DOF. Background inserted in Photoshop.

Hi JC,

it should work if you enable "premultiplied alpha" and keep the "disabled partial alpha" unchecked.

Hi Chris,
I've asked for this a few years ago.
Since that feature was never integrated, I did make an integration of the Blender Internal Material Settings a while ago:

viewtopic.php?f=32&t=49600&p=245338&hil ... rt#p245338

Choosing different UV-Sets via the UVW Projection Node in the Material Editor doesn't work.
It works as expected in Version 3.08.5

Hi DrawFun,

thanks for the reply.
Since not mentioned does the AI-Strength Parameter gets removed with the next Version?

Here an empty Blend File , when opened in Version 3.07 Octane imager is checked.
When opening in V4 it is unchecked.

Hi,

thanks for the update. Mix Materials now work again.

Checkbox Status (enable HDR tonemapping) of the Camera Imager (Preview) Panel from older files is ignored.

Please have a look: https://render.otoy.com/forum/viewtopic.php?f=114&t=69199#p348831
As reported. It even produces an error in the ...

Hi,

from what I was able to track down at least Mix Material Node isn't working in this Version.

Attached Log File