From 68827f41cfe497d57d6223d21bc32ddb94ab3a7a Mon Sep 17 00:00:00 2001
From: Justin Lin <justin.sdk@gmail.com>
Date: Sun, 24 Apr 2022 16:46:22 +0800
Subject: [PATCH] refactor: acos

---
 src/util/spherical_coordinate.scad | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/util/spherical_coordinate.scad b/src/util/spherical_coordinate.scad
index 1f816f05..5b2cc967 100644
--- a/src/util/spherical_coordinate.scad
+++ b/src/util/spherical_coordinate.scad
@@ -10,8 +10,9 @@
 
 function spherical_coordinate(point) = 
     // mathematics [r, theta, phi]
+    let(r = norm(point))
     [
         norm(point), 
         atan2(point.y, point.x), 
-        atan2(norm([point.x, point.y]), point.z)
+        acos(point.z / r)
     ];