Bouncing rays in GDScript for lasers or beams of light

raybounce.gd

# Try passing in randf() * x for distance_from_surface or angle_adjust to get some slight randomness

func bounce_rays(
	space: Physics2DDirectSpaceState,
	initial_pos: Vector2,
	initial_dir: Vector2,
	count: int,
	length: float,
	exclude:=[],
	distance_from_surface: float = 0.0,
	angle_adjust: float = 0.0
) -> PoolVector2Array:
	
	var p1 := initial_pos
	var p2 := initial_pos + initial_dir * length
	var rays := PoolVector2Array([p1])
	for i in count:
		var collision = space.intersect_ray(p1, p2, exclude)
		if not collision: break
		var bounce_dir = (collision.position - p1).normalized().bounce(collision.normal).rotated(angle_adjust)
		p2 = bounce_dir * length + collision.position
		p1 = collision.position + bounce_dir * epsilon + collision.normal * distance_from_surface
		rays.append(p1)
	return rays