[Verse-dev] The Common Denominator is NURBS

[trip somewhere]

Okay so is Sub-ds are so great could we get them even better and merge
the power that trims and cut outs have in Nurbs like in this paper ???
http://www.research.ibm.com/people/i/imartin/subdiv-sharp.html



On 4/14/07, eskil at obsession.se <eskil at obsession.se> wrote:
> That old chestnut. Quite some time since i heard this argument.
>
> Verse geometry is not polygons its creased Subdivision surfaces
> (although it can be used as polygons, something far too many take
> advantage of) and they are curved just like NURBS.
>
> NURBS are very cumbersome to use in the first place because they have
> a fixed topology: they are always grids. To fix this you need to be
> able to trim NURBS and that makes the math extremely complicated.
> Since the topology is fixed you need to use several patches to make
> objects, and that gives you loads of continuity problems especially
> when you do animation.
>
> SDS on the other hand has arbitrary topology and is very simple in the
> math department. With crease you can make both hard and soft edges.
>
> But the real kicker is that if you order SDS surfaces in a grid you do
> get a NURB surface! (the original paper on SDS was called something
> like: "recursively generated NURB surfaces with arbitrary topology").
> So if you have NURB Surface you can easily transport it using verse.
>
> Cheers
>
> E
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