function ActionEvent(source, pointerX, pointerY, meshUnderPointer, sourceEvent, additionalData) {
            this.source = source;
            this.pointerX = pointerX;
            this.pointerY = pointerY;
            this.meshUnderPointer = meshUnderPointer;
            this.sourceEvent = sourceEvent;
            this.additionalData = additionalData;
        }
@param source The mesh or sprite that triggered the action.
@param pointerX The X mouse cursor position at the time of the event
@param pointerY The Y mouse cursor position at the time of the event
@param meshUnderPointer The mesh that is currently pointed at (can be null)
@param sourceEvent the original (browser) event that triggered the ActionEvent