[vtkusers] draw a circle

[Zhang, Kewu (GE Healthcare, consultant)]

hi, guys.
 
When I try to draw a circle, I  used vtkDiskSource, by setting the inner
redius and out radius, i can get a circle. but the bad thing is: the
circle is 3 dimensional,  if I do the flip operation (view the circle
from the other side), I only can see a black circle, since the normal
problem.
then I tried the vtkregularPolygonSource to draw, I got a disk with the
same normal problem addressed above.
 
does anyone have a better solution?
 
kevin
 
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