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david sharp wrote in message <36F### [at] interport net>...
>Ken wrote:
>[ ... ]
>> I can't think of any other way to
>> have two opposing sides of a flat surface connected to each other. Looks
>> like I got lucky this time.
>
>
>The normals are at different corners, not the same place.
>The normals are, 'by definition', coming out of the same side of the
>triangle. If they are going in opposite directions, that, I thought,
>is just supposed to mean that the expected surface (not the actual
>triangle
>defined by the vertices) bends around that much.
That was also my interpretation. The image I have in mind is a short piece
of ribbon twisted so that one end is 180 degress to the other.
Gordon
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