From: Shaheen Gandhi <shaheen@fb.com>
Date: Sun, 18 Aug 2013 23:17:29 +0000 (-0700)
Subject: [Helix] Fix toroidal coil calculation
X-Git-Url: https://git.piment-noir.org/?p=SugarCubes.git;a=commitdiff_plain;h=ffb4b60ea2847464c8492419a6499c48d1e5c873

[Helix] Fix toroidal coil calculation
---

diff --git a/ShaheenGandhi.pde b/ShaheenGandhi.pde
index c25badd..a842fcf 100644
--- a/ShaheenGandhi.pde
+++ b/ShaheenGandhi.pde
@@ -42,10 +42,11 @@ class HelixPattern extends SCPattern {
 
     PVector rotatePoint(final PVector pt, final float rads) {
       Vec3D axisVec3D = new Vec3D(vector.x, vector.y, vector.z);
-      Matrix4x4 mat = new Matrix4x4();
-      mat.rotateAroundAxis(axisVec3D, rads);
-      Vec3D ptVec3D = new Vec3D(pt.x, pt.y, pt.z);
-      Vec3D rotatedPt = mat.applyTo(ptVec3D);
+      Vec3D originVec3D = new Vec3D(origin.x, origin.y, origin.z);
+      Matrix4x4 mat = new Matrix4x4().identity()
+        .rotateAroundAxis(axisVec3D, rads);
+      Vec3D ptVec3D = new Vec3D(pt.x, pt.y, pt.z).sub(originVec3D);
+      Vec3D rotatedPt = mat.applyTo(ptVec3D).add(originVec3D);
       return new PVector(rotatedPt.x, rotatedPt.y, rotatedPt.z);
     }
   }