def prepare(V):
"""Prepare the surface for slicing operation."""
global VA
V = V.translate(-V.center())
P = V.center()
print("Initial P = %s" % P)
VA = draw(V,bbox=None,color='black')
area,norm = surface.areaNormals(V.f)
N = norm[0]
return V,P,N
def testview(F,V,P):
global VA,waiting
p = array(GD.canvas.camera.getCenter())
waiting = True
while waiting:
GD.app.processEvents()
p -= array(GD.canvas.camera.getCenter())
print("TRANSLATE: %s" % p)
m = GD.canvas.camera.getRot()
P += p
print("TOTAL TRANSLATE: %s" % P)
V = V.affine(inverse(m[0:3,0:3])).translate(-P)
print(V.center())
print(F.center())
undraw(VA)
VA = draw(V)
area,norm = surface.areaNormals(V.f)
N = norm[0]
return P,N
