Hiding objects behind transparency

[jxrgen]

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:

[bepeg4d]

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

[milanm]

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

[jxrgen]

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?

[milanm]

Sure, here it is.

SolidEmissionFalloff-C4D.zip

(53.32 KiB) Downloaded 209 times

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

[jxrgen]

Amazing! Thank you!