Hi!
    In order to keep the 3D triangles deviate from the surface by less than e 
which is a user specified tolerance,I need to comput the longest edge size in 
parameter domain.I will make a translation of the bspline implementation if 
needed
    I found that the opennurbs has the method to creatmesh for ON_brep,I'll use 
it and test it's efficiency.
Cheers!
Laijiren
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