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This SOP uses an external POP network to run a particle simulation. It will import the state of the external POP network using the provided parameters. By connecting SOPs to the inputs of this SOP, one can override the Context Geometry which is used by the POP network.
To jump to the POP network, press on a POP Merge node tile and choose Edit POP Network. This also sets the View Operation parameters of the POP viewer to match those of the POP Merge node.
All POP networks can have 'Context Geometry'. These context geometries are set in the parameters of the POPNET, the Particle CHOP, or the Pop Merge SOP. In the Pop Merge SOP they can also be set by wiring OPs into the inputs of the operator. These context geometries can be referenced by the following POPs: Source POP, Collision POP, SoftBody POP, Attractor POP, Creep POP (All of which have the parameter - Geometry Source > Use Context Geometry). So, instead of hard-coding a specific piece of source geometry or collision geometry, a single POP network can be used by several Pop Merge SOPs to generate several different outputs, depending on the geometry input into the Pop Merge SOP.
A path to the POP to cook. If it points to a POP network, it will use the cook POP of that network.
Time at which simulation starts, based on seconds using the FPS of the scene.
At start time, simulation has already been running this long
Geometry to use as initial state of simulation
This value is used to initialize the pseudo-random sequence used by the simulation. It is useful for generating different simulations from the same network.
How many times to cook in between frames
Max # of Particles
Controls the maximum number of particles that can exist in the simulation at any given moment. A value of 0 means particles can always be birthed.
Remove Unused Points
Remove the points associated with dead particles. This can reduce the memory footprint of the simulation. On the other hand, disabling this option can improve performance by recycling points. Changing this option can affect the point numbers associated with individual particles.
The path to a SOP to use as Context Geometry N.
The display or render SOP can be specified using paths of the form object_path/display_sop or object_path/render_sop, respectively.