Rohan Dalvi shows how to trigger events in Houdini using CHOPs, like emitting particles when an object hits the ground.

Check out this latest tutorial from Rohan Dalvi that discusses how to use CHOPs in Side FX Houdini as a trigger for events that happen in animation.

Rohan shows how to have particles emit from an object hitting the ground. In Houdini, the Trigger Channel node adds an audio-style envelope to all trigger points in the input channels. A trigger point occurs whenever the first input’s channel increases across the trigger threshold value.