How to boost character in the direction you look?

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How to boost character in the direction you look?

KneeCola

I'm making a first person movement shooter and I'm trying to implement an ability where you fly for a brief moment in the direction you're looking, but I can't figure out how to get the direction you're looking at and apply a force in that direction. This is the code I'm using for the camera:

func _input(event):
	#get mouse input for camera rotation
	if event is InputEventMouseMotion:
		rotate_y(deg2rad(-event.relative.x * mouse_sense))
		head.rotate_x(deg2rad(-event.relative.y * mouse_sense))
		head.rotation.x = clamp(head.rotation.x, deg2rad(-89), deg2rad(89))
		head.rotation.y = clamp(head.rotation.y, deg2rad(0), deg2rad(0))

If anyone has any ideas I'd appreciate it. I haven't been able to find anything via google searches yet.