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X, YZ | x_boundy_bound, z_bound – Select between different container wall conditions for the simulation grid.

Open – The fluid is allowed to leave the bounding box of the Simulator through this wall. If Fill Up for Ocean is enabled, the Wall is treated as if there is infinite liquid below the Initial Fill Up level.
Jammed(-) – The simulation behaves as if there is a solid boundary in the negative direction. When Adaptive is enabled, the grid will not expand in this direction.
Jammed(+) – The simulation behaves as if there is a solid boundary in the positive direction. When Adaptive is enabled, the grid will not expand in this direction.
Jammed Both – The simulation behaves as if there is a solid boundary in both directions. When Adaptive is enabled, the grid will not expand in this direction.
Wrap  Wrap  – The left and right boundaries are connected (toroidal topology). E.g. Fluid leaving the Simulator from the +X wall will enter it again from the -X wall.

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ConfineGeometry
ConfineGeometry
Confine Geom | usegridgizmogridgizmo – You can specify a closed geometry object with normals pointing outwards, and the simulation will run only inside this object. The rest of the cells will be frozen as if a solid body was covering them. This way you can fill irregular shapes with liquid, or generally speed up your simulation by chopping off empty cells when you have an irregular fluid shape, e.g. a rocket launch.

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While using a Confine Geometry can speed up a simulation, it will not reduce RAM usage.

Cascade Simulator | usecascade, cascade  – Specifies the source LiquidSim to connect this Simulator to, forming a cascading simulation. This allows you to join several Simulators into a structure with a complex shape. This can help you reduce memory usage by using many smaller Simulators in place of a single large Simulator. For more information, see the Connecting Two Simulators in a Cascade Setup section on the Tips and Tricks page.


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  • In order to use a Cascade Setup you must have a fluid which flows from one Simulator into another. For more information, see the Transferring fluid between Simulators using a Cascade Connection section on the Interactions Between Simulators page.
  • The Simulators must be run sequentially and each one should be started only after the previous one has finished simulating. The Cascade Simulator parameter points to the previous Simulator in the sequence.
  • For the simulation to function correctly, you need to have the Velocity Grid Channel and all Particle Groups that are simulated in the Source Simulator exported to its cache files - otherwise the connection will not work properly.
  • If you intend to use any additional channels such as RGB, particle IDs or Ages, etc., they also need to be exported from the Source Simulator's Output rollout before running the current Simulator.
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