BT condition that checks a trigger (a boolean variable). [BTCheckTrigger] verifies whether the [member variable] is set to [code]true[/code]. If it is, the task switches it to [code]false[/code] and returns [code]SUCCESS[/code]. Otherwise, it returns [code]FAILURE[/code]. [BTCheckTrigger] can function as a "gate" within a [BTSequence]: when the trigger variable is set to [code]true[/code], it permits the execution of subsequent tasks and then changes the variable to [code]false[/code]. A boolean variable on the blackboard used as a trigger. See also [member BTTask.blackboard]. If variable's value is [code]true[/code], [BTCheckTrigger] will switch it to [code]false[/code] and return [code]SUCCESS[/code]. If variable's value is [code]false[/code], [BTCheckTrigger] will return [code]FAILURE[/code].