Output Generator Nodes

The output generator nodes output the different types of particle systems you can use. You can connect the Output Mesh and Prim (sprite, mesh etc) Path with the path input pins.

Geometry Replicator Node

The Geometry Replicator node generates geometry primitives onto the particles.

Geometry Replicator Parameters

Parameters	Description
Active	Toggle: Controls whether the Geometry Replicator Node is Active or Inactive.
Face Active Camera	Toggle: If this is active, the y axis of the geometry being replicated will face the camera for each replica. If this is inactive, the particle or shape used will use its local orientations.
Orient With Active Camera	Toggle: If this is active, the y axis of the geometry being replicated will face the camera for each replica, and the x axis of the geometry will be vertical relative to the camera. If this is inactive, the particle or shape used will use its local orientations. If active, face active camera is ignored.
Rotation	Rotate the particle in X Y Z in degrees.
Aim	Aim points the particle in a specific direction in x,y,z.
Up	Change the ‘top’ value of the particle in x, Y, Z.
Scale Multiplier	Multiply the particle’s size in x,y,Z
Filter Object Index	When this is non negative, geometry will only be copied to the particles with this object index. when this is negative, geometry will use the object index value in the emitter node.

Geometry Replicator Visualization

Visualization	Description
Visualize Geometry	Toggle: Enables mesh wireframe visualization.
Visualize Normals	Toggle: Enables mesh normal visualization.
Visualize Points	Toggle: Enables particle point visualization.
Visualize velocities	Toggle: Enables particle velocity visualization
Output to Mesh	Toggle: When active, this node writes to the prim(s) specified but the ‘outputs mesh’. When inactive: no prims are written to the particles.
Visualization Color	Color of the visualization in r, g, b, a.
Visualization Point Diameter	Visualization point diameter.
Visualization Line Width	Visualization line width.

Geometry Replicator Source Primitive

This group allows you to add source primitives to your emitter.

Source Primitive	Description
Primitive	This field shows where your source geometry primitive is located in the stage/layer.
Add Target(s)	This button allows you to add source primitives to the geometry replicator.

Point Instancer Node

The point instancer node writes geometry instances to the particle points. You can connect the Output Point Instancer and Prototype Prim (sprite, mesh etc) Path with the path input pins.

Point Instancer Parameters

Parameters	Description
Active	Toggle: Controls whether the Point Instancer Node is Active or Inactive.
Face Active Camera	Toggle: If this is active, the y axis of the geometry being replicated will face the camera for each replica. If this is inactive, the particle or shape used will use its local orientations.
Orient With Active Camera	Toggle: If this is active, the y axis of the geometry being replicated will face the camera for each replica, and the x axis of the geometry will be vertical relative to the camera. If this is inactive, the particle or shape used will use its local orientations. If active, face active camera is ignored.
Rotation	Rotate the particle in X Y Z in degrees.
Aim	Aim points the particle in a specific direction in x,y,z.
Up	Change the ‘top’ value of the particle in x, Y, Z.
Scale Multiplier	Multiply the particle’s size in x,y,Z
Filter Object Index	When this is non negative, geometry will only be copied to the particles with this object index. when this is negative, geometry will use the object index value in the emitter node.

Visualizer Node

The Visualizer node outputs point visuals to the viewport only. There is no representation downstream and there is no data in the stage.

Visualizer Parameters

Parameters	Description
Active	Toggle: Controls whether the Visualizer Node is Active or Inactive.
Color Particles by Aim	Change the color of the particles based on their aim. Generate Color and Opacity must be enabled in the emitter node for this to function.
Rotation	Rotate the particle in X Y Z in degrees.
Aim	Aim points the particle in a specific direction in x,y,z.
Up	Change the ‘top’ value of the particle in x, Y, Z.
Scale Multiplier	Multiply the particle’s size in x,y,Z

Flow Emitter Output Node

The flow emitter output node connects the particle system to the flow emitter point node. This allows a flow emission to be controlled by a particle system

Flow Emitter Parameters

Parameters	Description
Active	Toggle: Controls whether the Flow Emitter Node is Active or Inactive.
Color Particles by Aim	Change the color of the particles based on their aim. Generate Color and Opacity must be enabled in the emitter node for this to function.
Rotation	Rotate the particle in X Y Z in degrees.
Aim	Aim points the particle in a specific direction in x,y,z.
Up	Change the ‘top’ value of the particle in x, y, z.
Scale Multiplier	Multiply the particle’s size in x,y,Z

Flow Emitter Relationships

Relationships	Description
Input:particles	Connect a particle emitter solver.
Add Target(s)	This button allows you to add a particle emitter solver.
output:flowEmitterPoint	Connect to a point cloud flow emitter.
Add Target(s)	This button allows you to output to a point cloud flow emitter node.

Point Cloud Flow Emitter Node

Parameters for the Point cloud flow emitter are located on the Flow page.

Point Cloud Flow Emitter

Path Node

The path node is generated when you add a prim into the Particle Editor. It contains the pathway to your prim, sprite, mesh or output.

For example: when you pull a Sphere Mesh into the Particle Editor, a Create Node for Prim window appears.

Select Constant Path and a path node will appear in the Particle Editor.

Path Node Inputs

Inputs	Description
Value	Path is created automatically if you drag and drop your prim in You can type in the path here

Note

the Path Node name will change based on what was added to the particle editor.

Prototype Node

The prototype holds objects in the USD stage where we pick data from for the purpose of the particle system - usually instancing to the points.

Prototype Node Visual

Visual	Description
Default	Dropdown: Draw the particle with default settings.
Guide	Dropdown: Draw the particles as a guide in the viewport.
Proxy	Dropdown: Draw the particles with proxy settings.

Sprite Node

The Sprite is automatically created as a default display method when creating particle systems using the menu method. It has all of the primitive transforms to use.

Sprite Node Transforms

Transforms	Description
translate	Move the output in world space in X Y Z
Rotation	Rotate the particle in X Y Z in degrees by default. Left click the down arrow to change rotation orientation.
Scale	Scale the particle’s size in X Y Z.