From 4632b1defebe17221058527d2217d5c7e56eca22 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Wed, 29 Nov 2017 19:40:00 +0000
Subject: [PATCH] helixish: fix tilt sense

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 helixish.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/helixish.py b/helixish.py
index dde107d..a4519a2 100644
--- a/helixish.py
+++ b/helixish.py
@@ -142,8 +142,8 @@ class HelixishCurve():
     tilt = atan(start_mu)
     tilt_basis = np.array([
       [ 1,     0,           0,         0 ],
-      [ 0,   cos(tilt), -sin(tilt),    0 ],
-      [ 0,   sin(tilt),  cos(tilt),    0 ],
+      [ 0,   cos(tilt),  sin(tilt),    0 ],
+      [ 0,  -sin(tilt),  cos(tilt),    0 ],
       [ 0,     0,           0,         1 ],
     ])
     findcurve_basis = matmatmultiply(dPQplane_basis, tilt_basis)
-- 
2.30.2