Volumetrics in Physical Material cuts out reflect underneath

Chaos Corona for Cinema 4D > [C4D] I need help!

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blauwfilms:
Hello Forum,

I've been working on a Planet Earth setup and I'm getting stuck when applying a layer of Clouds.
The setup uses multiple spheres that are stacked on top of each other. From bottom to top:
• Earth (Layered Material: Land + Water [using a Mask])
• Fog (Using a textured Volume Material)
• Clouds (Physical Material with Opacity Map [for Cloudy areas] and Volumetrics)

When the Clouds layer is turned out I get a very strong Reflection that covers the planet.
The sunlight is unable to shine through the Clouds Layer (See attached images)

I've also attached images of the material setup for the Clouds.
I have a feeling as if that could be where the issue is?

If you have any questions of the setup, feel free to ask :)
I'd love to find a solution to this.

All the best, Leo

maru:
It could be related to the way various volumetric media interact with each other. What happens if you change the IOR of the clouds material to 1.0?
What happens if you use a Corona Volume Material for the clouds instead? (absorption can be used instead of opacity: pure white absorption = 0 opacity)

blauwfilms:
@maru Ah great tips! Let me try that now.
The reason I opted for a Physical Material with Volumetrics was that I wanted to use Displacement.
Is there an alternative that I could use in a Volume Material?

blauwfilms:
@maru Changing the IOR to 1.0 actually changed quite a bit! Thanks!
It allowed more light to come through. The first image I've attached uses the IOR of 1.0, a Displacement map and Volumetrics.
The second image uses a Corona Volume Material. As you can see it doesn't have any Displacement and I don't know what workaround I could use to get that in there.

I'm rendering out a pass now with the clouds over the Earth material with all the other volumes turned on.
Let's see if it still works :)

maru:
You can create a Corona Volume Mtl with displacement this way. :)

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