En Fri, 18 Sep 2009 03:12:46 -0300, rantingrick <rantingr...@gmail.com>
escribió:
I am creating geometry with OpenGL. When you create a face you must
specify a winding order (clockwise or counter clockwise) this winding
order controls which side of the face will be visible (since only one
side of a face is rendered). So to create a two sided face you must
create two faces that share the exact same points, BUT have opposite
windings, hence the need to create a face with a "backface" attribute
that contains the mirrored face instance. So now i can move the
frontface around and i have a handy reference to the backface so i can
make it follow!
class Face:
def __init__(self, pts, nested=True):
if nested:
newpts = reverse(pts)
self.backface = Face(pts, nested=False)
def translate(self, v):
#offset front and back face by vector
two sided faces, yippie!
I'd use a factory:
class Face:
otherside = None
def __init__(self, pts):
self.pts = pts
class BiFace(Face):
otherside = None
def BiFaceFactory(pts):
front = BiFace(pts)
back = BiFace(list(reversed(pts)))
front.otherside = back
back.otherside = front
return front, back
And so ends another long day of coding. This is addicting. Does
anybody know of a good Coders Anonymous group, i think i may have an
addiction. 16 hours of strait coding with 4hrs sleep last night and
only stopping for one meal (lunch) still have not ate dinner yet!
Gheez! ;)
Remember, there is a whole world out there!
--
Gabriel Genellina
--
http://mail.python.org/mailman/listinfo/python-list
