When I define the normals at the corners of a smooth_triangle,
how exactly is the interpolation done -- is it a linear weighted sum of 
the corner vectors, or something subtler?  Is each normal vector first 
converted to a unit vector?

(Yes, I have a project in mind which could depend on such subtleties.)

-- 
Anton Sherwood, http://www.ogre.nu/
"How'd ya like to climb this high *without* no mountain?" --Porky Pine

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