J-Print News wrote:
> 
> Doesn't Rhino3d use iso surfaces? I know it uses mathematical functions to
> model surfaces. If not, what s the difference. What's the difference between
> nurbs and iso surfaces?
> 
Rhino uses NURBS (non-uniform rational B-spline) surfaces. NURBS are
parametric surfaces, where surface is described by 2 additional
parametric values u and v. To put it bluntly, for NURBS surface there is
3 equations:
x = fx(u,v)
y = fy(u,v)
z = fz(u,v)
You run u and v values over given range (quite often it is from 0-1) and
calculate points (x,y,z) on surface.

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