Thanks K_J_M.

It seems to me that basic, building-block code like this should be available in a standard form we could all share.

Instead it seems we all implement the same algorithms and (never having common test data in most cases) we often don't know about the bugs we have in our version.

The alternative is to buy some API that has more than what you need.

Hi Catmull Dog.

Yes, i totally agree with you.

Theres nothing worse than having to re invent the wheel.

I'm really suprised i havn't been able to find an already established algorithm for solving this problem.

But if i find one, i'll definately share it with the community.

I think that everyone is so happy to get theirs working they regard it as a trade secret once it does work.

It often seems as though the very authors of the articles resent it when you get it working.