CGside shows how to make a cliff in Maya Bifrost, which includes working with volumes.
Check out this tutorial that uses Autodesk Maya Bifrost to procedurally create a cliff, including working with volumes, meshing, and scattering vegetation.
The tutorial host, CGside uses Envit, the Maya scattering script that uses Bifrost in the backend.
A while back, Simon Verstraete shows a more elaborate method for creating cliff faces with Side FX Houdini that is similar in process. Check out that tutorial here.
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