Hi,
Sean has left the following comment at Add a primitive surface area
function ... for triangle meshes (BOT)
http://www.google-melange.com/gci/task/view/google/gci2012/7968224:
more questions
Johannes,
There are obviously lots of ways, but keeping the interface minimal is our
usual approach. Since we don't yet know of multiple types of errors (and
even this one suggested is temporary), the only cases we know about are
unimplemented, a surface area, no surface area, or an error. Unimplemented
is a NULL callback. Surface area is obviously a >0 value. No area is
obviously 0, so using negative to imply an error fits naturally.
You are certainly welcome to also implement it for surface mode, but let us
create another task for you to claim. This one is complex enough. That
said, the answer is not just double the one-sided area. You have to account
for the sides of any exterior edges.
Greetings,
The Google Open Source Programs Team
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