Use vector.dot and vector.cross in vector.angle

builtin/common/vector.lua

@@ -71,11 +71,9 @@ function vector.direction(pos1, pos2)
end

function vector.angle(a, b)
	local dotp = a.x * b.x + a.y * b.y + a.z * b.z
	local cpx = a.y * b.z - a.z * b.y
	local cpy = a.z * b.x - a.x * b.z
	local cpz = a.x * b.y - a.y * b.x
	local crossplen = math.sqrt(cpx ^ 2 + cpy ^ 2 + cpz ^ 2)
	local dotp = vector.dot(a, b)
	local cp = vector.cross(a, b)
	local crossplen = vector.length(cp)
	return math.atan2(crossplen, dotp)
end