On 3 Mar 1996, Peter H. Gien wrote:
> Computational burden of computing normal vectors from the right hand rule is
> 50,000 facets would involve 50,000 * 6 multiplies and 50,000 * 3 additions.
> Doing this on a 60MHz Pentium would take around 1/2 of a second. On my old
> intel 80286/287 it would have taken around 2 seconds.
And how long would it take these machines to read the normal data from a
file? I suspect quite a bit longer. Especially if it is an ASCII file.
I agree that it is foolish to include normal data in a mesh file. (The
above estimate seems a bit too fast, especially if you consider
normalizing the vector which includes a square root operation, but still,
the time required on a modern computer is insignificant.)
> OK, would the original perpertrator of the STL format please identify
I doubt anyone would admit to doing it.
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