> 
> I've implemented this in my own raytracer, the neighbouring triangles are
> required to satisfy boundary conditions for subdivision, unless these
> conditions are specified manually (which is rather awkward).  The
> implementation really is quite interesting, if you are interested check
> out the paper:
> http://www.seanet.com/~myandper/abstract/eg03.htm
> 
> Andrew

Sorry, A more relevant paper is:
http://portal.acm.org/citation.cfm?id=344829&dl=ACM&coll=portal

Although both these are highly relevant to a raytracing implementation of
subdivision and displacement mapping.

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