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collider_active_events

Event handlers are user-defined callbacks used to be notified when two colliders start/stop touching. By default no collision event is generated by the narrow-phase. In order to enable a collision event for a pair of colliders, at least one of the involved colliders must have the corresponding event set as active. An event is activated for a collider by setting its corresponding active events bit to 1:

  • Setting the R3_COLLISION_EVENTS bit to 1 enables the collision events involving the collider.

The active events of a collider can be set when the collider is created or after its creation:

/* Set the active events when the collider is created. */
R2ColliderDesc collider = r2BallColliderDesc(0.5);
collider.activeEvents = R2_COLLISION_EVENTS;
/* Set the active events after the collider creation. */
r2Collider_SetActiveEvents(collider_handle, R2_COLLISION_EVENTS);
assert(r2Collider_ActiveEvents(collider_handle) & R2_COLLISION_EVENTS);