<cat>Code.Physics</cat> <title>Triggers</title> # Detecting collisions To detect when an object enters or exits a trigger, both GameObjects must have a collider component attached, with the `Is Trigger` box checked on the trigger GameObject. Then create a component on the `same GameObject` as the collider marked as a trigger, and inherit from `Component, Component.ITriggerListener` ⤶ ```c#⤶ ⤶ ```cs⤶ public sealed class TriggerDebug : Component, Component.ITriggerListener { [Property] public NameTagPanel NameTag { get; set; } int iTouching; void ITriggerListener.OnTriggerEnter( Collider other ) { iTouching++; NameTag.Name = $"{iTouching} touching\n{other.GameObject.Name} entered"; } void ITriggerListener.OnTriggerExit( Collider other ) { iTouching--; NameTag.Name = $"{iTouching} touching\n{other.GameObject.Name} left"; } } ``` <note>NameTagPanel is a custom razor component that displays text on a **World Panel**</note> <upload src="b4aa4/8dc3b149e74a703.mp4" size="4036001" name="sbox-dev_bMHJ0Vp4ne.mp4" />