Particle Collision Event Editor

Navigate to nParticles > Particle Collision Event Editor .

Using the Particle Collision Event Editor, you can create, edit, and delete collision events for Maya classic particles and nParticles. The options in this editor let you specify the details of your particle collision event such as setting whether or not the source particle object dies and specifying number of new particles that are emitted from the event.

You can also create particle collision events using a MEL procedure. For information, see Create a MEL procedure for collision events.

Related Topics

Objects and Events

Click a particle or nParticle object name in the Objects list to select it. All events belonging to the selected object are displayed in the Events window.

Update Object List

Updates the list of objects when you add or delete particle objects and events.

Selected Object

Displays the selected object.

Selected Event

Displays the selected event.

Set Event Name

Lets you change the name of the selected event. Event names display in the Events window. Event names cannot include spaces.

Creating Event/Editing Event

Indicates that you are either in event creation mode or event editing mode.

New Event

Creates a new collision event.

All Collisions

When on, the event is executed each time a particle collides. When off, the event executes at the collision specified by the Collision number.

Note:

For nParticles, the maximum number of collisions for each particle is one collision per simulated frame.

Collision Number

Sets which collision executes the collision event.

Event Type

Specifies the details of the collision events such as the number and type of target particles created by the event.

Type

Sets the type of collision event you want to create. Select either Emit or Split.

Emit

Sets Emit as the event type. When on, the source particle object continues to live after the collision event. The target particle age is 0 when it is created.

If you want to use Emit as the event type and still have the source particle die, turn on Original particle dies.

Split

Sets Split as the event type. When on, the original particle object dies after the collision event. The target particle inherits its age from the source particle.

Random # Particles

When on, a random number of target particles are created for each collision event. For the range of particles created, the minimum number of particles is 0 and the maximum number of particles is set by the Num Particles value.

Num Particles

Sets the number of target particles created by a single collision event.

For example, a value of 1 creates 1 target particle each time a source particle collides, while a value of 10 creates 10 target particles each time a source particle collides.

Spread

Sets the spread of the target particles created from the event.

Target Particle

Lets you specify the target particle object for the event. Type the name of the existing particle system you want to use as the target particle system. You can use either the name of the particle objects shape node (particleShape or nParticleShape) or its transform node name (particle or nParticle).

If you do not specify a particle type, the target will be an nParticle.

Inherit Velocity

Sets the percentage of the source particle's velocity that is inherited by the target particles after the collision event.

Event Actions

Original Particle Dies

When on, the source particle dies after the collision event.

Event Procedure

Lets you enter a MEL script Event Procedure that will be called when a specified particle (the particle that owns the event) collides with an object. The procedure must have the following format and argument list:

global proc myEventProc(string $particleName, int $particleID, string $objectName)

See Create a MEL procedure for collision events.

Create Event

Creates the collision event.

Delete Event

Deletes the collision event.

Close

Closes the Particle Collision Event Editor.