def listtotriangles(Pts, triangles, Surf=None):
Ts = []
for ps in triangles:
try:
ip1, ip2, ip3 = ps
p1 = Pts[ip1]
p2 = Pts[ip2]
p3 = Pts[ip3]
Ts.append(Sh.Triangle(p1, p2, p3, Surf))
except:
print 'ERROR: Invalid point for triangle definition'
return Ts
