The Flows category provides shortcuts for creating different kinds of initial particle-system setups. To use a flow, simply drag it from the depot to the Particle View main window. The available flows are listed at the end of this topic.
Preset Flow merges a previously saved Particle Flow setup into the current scene. It allows you to use the flow as an event within your current flow, or as a starting point for a new particle system.
Empty Flow provides a starting point for a particle system consisting of a single global event containing a Render operator. This lets you build a system completely from scratch, without having first to delete the default operators provided by the Standard Flow system.
Standard Flow provides a starting point for a particle system consisting of a global event containing a Render operator, wired to a birth event containing a Birth, a Position, a Speed, a Rotation, a Shape, and a Display operator, with all parameters set to default values. This is the same system that 3ds Max creates automatically when you add a Particle Flow icon to the viewport.
One Click Flow provides a starting point for a particle system that uses cached, external particle data in the form of Maya nCache files. The flow comprises a Birth File operator, a Material Static operator for assigning a material to the particles, a Shape operator, and a Display operator.