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> When calculating the normals, do I use the remaining two triangle vertices, or
> the orthogonal edge vectors of the square?
You lost me here with the "orthogonal edge vectors of the square".
I would always use triangle vertices.

> Do I normalize the vectors before using vcross()?
I never do.

> Do I normalize the resulting vertex normal vectors?
Yes! Well, I usually do mesh2, I add all the normals for a point togather then
normalize that.

How are you filling the smooth_triangle.
From the sound of it, a normal and a triangle values may be switched.

Hope this helps some.

Have Fun!

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