I’m running a fluid simulation in Blender 3.5.0 with one domain, one inflow, and three effector objects. An ordinary sphere, set as an effector, positioned in the way of the downflowing fluid, blocks the flow. If I edit the sphere to remove a few vertices, ones that aren’t near the fluid stream, the object stops acting as an effector. Is this a bug in Blender? Or is this yet another quirk in the fluid simulator I need to click an option or find some workaround for?
( Everyone is crying for bugs…)
Maybe it’s just that effectors should be closed surfaces… or set to planar… see: docs.blender manual physics fluid type effector:
Is Planar
Defines the effector as either a single dimension object i.e. a plane or the mesh is Non-manifold. This ensures that the fluid simulator will give the most accurate results for these types of meshes.
A Manifold mesh can also be declared as planar. The fluid solver will then ignore the volume inside the mesh and just emit fluid from the mesh sides.