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I was wondering if there is a simple method that provides the function of the "Seen by transparency" option of the C4D Render Tag.

In this example done with C4D I use a fresnel map to drive the opacity channel but I don't want to see the "hidden" objects. So I turned off the option "Seen by transparency" in the C4D Render Tag. But this does not work with Octane. Is there a simple option to do that?

I don't want that: I want this:

Have you tried to use the Falloff node in another channel than Opacity?
Here is an example of using it in the texture input of a Texture emission node: ciao Beppe

In addition to what Beppe just wrote, you can also hide Texture Emission in refractive materials by disabling "visible on specular". Here I used a Universal material with Transmission 1 and IOR 1.0001, just enough to make it qualify as refractive material.



Currently we can only hide objects from refraction, not opacity. When you are ready for something more than a simple solution, you can check out Raytype OSL Texture in the utils category. By using it in opacity you can hide any object from refraction (including it's own).

Cheers
Milan

Thanks Beppe, that is a workaround I have thought about too.

Thanks Milan, this seems like the thing I am searching for. But somehow I cannot recreate your solution. Would you mind, uploading me a file with the material as an example?

Sure, here it is. In the meantime I also added Side in opacity to reduce the number of specular bounces that are needed. This is not necessary but it helps with more complex models.

Cheers
Milan

Amazing! Thank you!