Tim Nikias wrote:
> Hey, thanks for the link! Not only is the subdivision stuff interesting, but
> the other stuff as well! :-)
> 

My parametric surface generator uses uv-interpolated points.  Basically I 
interpolate the parameters and calculate the function at that point:

p(i,j) p(i+1,j)
  i(i+.5,j+.5)
p(i,j+1) p(i+1,j+1)

Now my "quads" are split into 4 triangles each, at the cost of (at most) 
doubling the number of points.  I think the effect is called face-centered square.

Mind you I now have to keep track of whether the u and/or v loops are closed or 
not.  A far edge of the interpolated grid goes away if its associated loop is open.

--------------
David Wallace
TenArbor Consulting
"Just In Time Cash"
www.tenarbor.com
1-866-572-CASH

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