Houdini 21.0 Nodes Copernicus nodes

Flow Block Begin Copernicus node

Start of a Flow simulation block.

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Since 21.0

This node marks the beginning of a Flow simulation block.

Flow simulations are simple 2d simulations of incompressible flowing liquid.

Operations that are indepdent of previous frames should occur before the block so they only get cooked once. Likewise, post processing operations that are not needed to feedback should occur after the block end.

The passthrough input can be used to bring additional inputs inside the block, and the feedback to add additional values that need to be updated every frame.

Parameters

Block Path

The path to the Flow Block End COP that’s the final and closing node of this block. The Block End node must be at the same network level as this Block Begin node.

Buoyancy

The strength of the internal buoyancy force. The temperature field will be scaled by this to add a force to the velocity.

Buoyancy Direction

The direction that higher temperatures will move in.

Correct Initial Velocity

The incoming velocities will be pressure-projected to ensure they are valid velocities for fluid motion.

Layers to Advect

The wire-names of the layers to advect by the velocity layer.

Note that the velocity layer v is always advected.

Inputs

color

An RGBA layer for the initial colors of the fluid.

This is only read on the initial frame.

v

A UV layer providing the initial directions of the flow.

This is only read on the initial frame.

temperature

A optional Mono layer providing the iniital temperatures of the fluid.

This is only read on the initial frame.

feedback

A Cable providing wires that will be fedback to the next iteration of the solve. It is important the input’s cable structure exactly matches the Flow Block End’s input.

This is only read on the initial frame.

passthrough

Optional Cable providing layers that should be computed outside of the simulation. They will be read each frame, so can be used to inject animated sources; but cannot depend on the results of the simulation.

Outputs

color

An RGBA layer of the color that has been fedback to this frame.

v

An UV layer of the velocity that has been fedback to this frame.

temperature

An Mono layer of the temperature that has been fedback to this frame.

feedback

A Cable of the extra data that has been fedback to this frame.

passthrough

A Cable passing through the input, so updating every frame from the input.

See also

Copernicus nodes