Effectors

Effector objects offer a way to add collisions to your simulation. These types of objects can be any mesh. To add an effector object, select any mesh. Then, in the Physics panel, select Fluid | Type | Effector.

There are two types of effectors in Mantaflow: Collisions and Guides. We learned about Guides earlier, so let’s select Collision. Let’s go over the four settings:

• Sample Substeps is very similar to Substeps for the flow object. If you have a fast-moving collision, it’s recommended to turn this value up; otherwise, you might get some inaccuracies.
• Surface Thickness is the area around the object that will be considered a collision. Higher values will result in fluid colliding further from the surface.
• Use Effector enables or disables the effector. This can be useful for animating the collisions and turning them off and on.
• Again, if your effector is non-manifold, then make sure Is Planar is checked. This will help Blender get...