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[Daniel Duque Campayo <>]

Hello,

For the record, I have found the answer to my question.

>             T.flip(f,indx);

You cannot flip just any pair of adjacent triangles: they have to form a 
convex object!

This is precisely what the precondition error was telling me (as soon as I 
realized "orientation" meant position of a point relative to a line, not 
triangle orientation). This makes sense, since for my terrain such a 
forbidden flip would create a two-valued (folded) terrain, not quite what one 
wants.

Best,

Daniel


-- 
Daniel Duque
http://rincon.uam.es/dir?cw=950067138671875