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>What I'd like to be able to do is have a C function (later a class ... >one step at a time) that could do this: > >Point3D add(Point3D a, Point3D b) See http://lua-users.org/wiki/VectorLibrarySample and also my bc binding at ftp://ftp.tecgraf.puc-rio.br/pub/lhf/bc.tar.gz . --lhf