khodjaev replied to mranosa's topic in Lighting & RenderingHi, I hope that it will help you. speed_calc.hip
If I understood you right, you have to create group of points in a bottle (using bottle as bounding object), for example named "emmpoint" . Then simple delete points which will be beyond of this group. And use this for tank initial. Another way is using your bottle geometry as collision object in wave tank. Also try to set collision properly in dop network. Use volume (VDB) and volume sample mode for it.