I'm simulating local water surface effects using a volume fluid and objects interacting with it.

Then I would like to merge (extend) the fluid surface with a much larger grid that represents the full ocean and use a displacement shader to add additional effects such as ocean waves.

Since I'm using a displacement shader and raytracing it's beneficial to keep the gridres as low as possible.


I tried just deleting the edges and bottom from the fluid levelset grid using expressions to turn it into a plane. Then I made a hole in a larger grid and simply merged them together. This works fairly well if I make sure the fluid sim never reaches its boundary. However at certain camera angles there might be a small gap between the two surfaces if not perfectly aligned in y-dir.

There must be a better way to stitch the surfaces together?

I guess I could write my own sop for it which deletes edges and bottom from the fluid and then simply extends the surface in all directions.

Any ideas?

I've had some success by scattering points on both surfaces and using the particle fluid surface sop to make a seamless mesh. I found best results when i deleted the intersections of the surfaces before using the scatter sop.