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Attempting to manipulate a volume cube by manipulating the mesh.
I've subdived / pinned the top face of the mesh to an ocean sim with a shrinkwrap (trying to simulate an underwater volume so I can pan my camera below the surface seamlessly.)
The mesh is definitely being manipulated but the volume remains unaffected and maintains the shape of the original mesh during the simulation.
Any help is appreciated.
I don't know why that's not working for you; I probably couldn't say without a file. However, what I would do in that situation is a little different, and testing it out, it works just fine:
Rather than creating a separate volumetric mesh, which is never going to completely agree with the ocean surface, I simply solidified my ocean. In order to flatten the bottom and take it to the depth I need, I mark the solidify shell with a vertex group and then shrinkwrap it to a non-rendering plane.
Worth mentioning that this is Cycles only, and this isn't going to work in Eevee without multiple renders and a decent bit of shader wizardry.
