mesh: fix polygon rotation offset for wire

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/meshscad b/meshscad
index 85b03a1f3b0d6804937bc2210031637148701eee..c043e684f1b289a4726181b1ab4c623d5887fa30 100755 (executable)
--- a/meshscad
+++ b/meshscad
@@ -63,7 +63,7 @@ def make_moebius(objname):
   for v in range(0, nv):
     for w in range(0, nw+1):
       for s in range(0, ns):
-        sigmas = [ (s + sx + 0.)/ns * tau for sx in 0,1 ]
+        sigmas = [ (s + sx + 0.5)/ns * tau for sx in 0,1 ]
         #print('VWS',v,w,s, sigmas, file=sys.stderr)
         if not w % each_w:
           extents[w % nw].quad([ cnr for cnr in qc(v,w,sigmas,False) ])