Using Kill Planes

Use kill planes to delete unwanted liquid or foam particles from your simulation.

Particles are removed the moment they cross the local Z axis of the plane. Kill planes can help reduce unnecessary calculations and speed up performance, so adding at least one kill plane below your desired simulation area is a good practice. You can create as many kill planes as you want in a single simulation.

The size of an individual plane primitive is irrelevant in kill planes. Any particle crossing the Z-axis of the plane will be killed regardless of the actual object's size.

Note: Using kill planes with guided simulations is not advisable as these simulations must constantly reseed particles in order to prevent gaps between the fluid and the guides.

To add a kill plane to a simulation:

1. In the Create panel, select Standard Primitives > Plane and create a Plane object in the scene.
2. Select the fluid simulation and in the Setup rollout, click Simulation View to open the Simulation View window.
3. In the Liquid Attributes panel under Colliders/Kill Planes > Add Kill Planes, click Pick to select the plane in the viewport, or Add to select the plane from the Add Kill Planes dialog.

To delete a kill plane from a simulation:

1. In the Liquid Attributes panel under Colliders/Kill Planes > Add Kill Planes, select the kill plane to be deleted from the list.
2. Click the Trashcan button.

   The kill plane is deleted.

   You can also select the object used as a kill plane and delete it directly from the scene. The kill plane is automatically removed from the simulation.