Trigger Event Block reference

Always: Spawns particles each frame.
Over Time: Spawns particles at a specified rate per second.
Over Distance: Spawns a set number of particles over the distance a parent particle moves.
On Die: Spawns particles when a parent particle dies.
On Collide: Spawns particles when a particle collides with another particle.

The Trigger Event Block spawns particles using a GPU Event.

Block compatibility

You can add the Trigger Event Block to the following Contexts:

To add a Trigger Event Block to your graph, open the menu for adding a graph element then select GPUEvent > Trigger Event.

Trigger Blocks always execute at the end of the Update Context, regardless of where you place the Block.

Property	Type	Description
Mode	Enum	The options are: Always: Spawns particles each frame. Over Time: Spawns particles at a specified rate per second. Over Distance: Spawns a set number of particles over the distance a parent particle moves. On Die: Spawns particles when a parent particle dies. On Collide: Spawns particles when a particle collides with another particle.

Input	Type	Description
Count	Uint	Sets the number of particles to spawn. This property is available only if you set Mode to Always, On Die, or On Collide.
Rate	Float	Sets the rate at which to spawn particles. This property is available only if you set Mode to Over Time or Over Distance. If you set Mode to Over Time, Rate sets the number of particles to spawn per second. If you set Mode to Over Distance, Rate sets the number of particles to spawn over the distance the parent particle moves.

Output	Type	Description
Evt	GPU Event	The GPU Event to trigger.

Property	Type	Description
Clamp To One	Bool	Limits GPU Events to one per frame. This property is available only if you set Mode to Over Time or Over Distance.