From fafa551959ef84006083c91cd03a12fb51be7d0d Mon Sep 17 00:00:00 2001
From: Justin Lin <caterpillar@openhome.cc>
Date: Fri, 17 May 2019 17:59:08 +0800
Subject: [PATCH] added torus_knot

---
 src/torus_knot.scad | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 src/torus_knot.scad

diff --git a/src/torus_knot.scad b/src/torus_knot.scad
new file mode 100644
index 00000000..6bf26975
--- /dev/null
+++ b/src/torus_knot.scad
@@ -0,0 +1,11 @@
+function torus_knot(p, q, phi_step) = [
+    for(phi = [0:phi_step:6.28318])
+    let(
+        degree = phi * 180 / 3.14159,
+        r = cos(q * degree) + 2,
+        x = r * cos(p * degree),
+        y = r * sin(p * degree),
+        z = -sin(q * degree)
+    )
+    [x, y, z]
+];
\ No newline at end of file