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I'm trying to make a fluid with something dissolved into it. It's almost opaque but there are some spots of lower density solute. This is why I can't just use nodes on surface alone--I need to be able to have the opacity partly dependent on thickness.

I figured I could use a Principled Volume node and then put a low roughness, max transmission Principled BSDF node on the surface to give it the reflection and physical surface.

node setup

It didn't work. I was expecting the cube to look a bit like white watercolor paint or milk mixed with water. Instead, I got a black cube.

enter image description here

What is this and how can I fix it?

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  • $\begingroup$ maybe lower your Principled Volume Density value? $\endgroup$ – moonboots May 28 at 6:36
  • $\begingroup$ @moonboots I need it fairly high so that it is mostly opaque-ish. $\endgroup$ – Bobby G. May 28 at 7:17
  • $\begingroup$ maybe show a picture of what the result should be, if you want something milky perhaps use the Subsurface value? $\endgroup$ – moonboots May 28 at 7:28

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