The Pipeline Build a sell-out stadium crowd
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With so few online resources readily available for creating crowds, the ability to do just that in Houdini 20 was exciting for me.
A crowd system is made up of characters that have a set of rules to define their appearance, animations and interactions. Such crowds are essentially animated characters attached to particles, with the movement of those characters, commonly called agents, in a crowd simulation based on an underlying particle simulation in DOPs.
In a crowd simulation, the agents are in a particular state at any given time, such as standing, walking or running. Events can happen in a crowd simulation that change the state of the agent, for example from walking to running. These events are called triggers.
Crowd simulations require both a geometry (SOP) network and simulation (DOP) network. The geometry network is used to create and define the agents and their positions from existing models such as terrain, or in this case our stadium. A simulation network holds the logic that controls the movement of each particle,
