def get_normal(tri):
"""in: 3 verts, out normal (nx, ny,nz) with length 1
"""
(v0, v1, v2) = tri
p0 = Point.from_list(v0.get())
p1 = Point.from_list(v1.get())
p2 = Point.from_list(v2.get())
a = Vector.from_points(p1, p0)
b = Vector.from_points(p1, p2)
#print p0,p1, p2
#print a,b
c = a.cross(b)
#print c
m = float(c.magnitude())
normal = [c.x / m, c.y / m, c.z / m]
return normal
def dist(v1, v2):
''' distance between 2 vertices'''
p1 = Point.from_list(v1.get())
p2 = Point.from_list(v2.get())
v = Vector.from_points(p1, p2)
return v.magnitude()