"Kenneth" <kdw### [at] gmailcom> wrote:
> But using the recommended
> double_illuminate causes strange visual artifacts to appear on an 'applied'
> normal{...}.
>

"Artifacts" is the wrong word, I admit; the effect is probably a natural result
of 'double-illuminating' the applied normal-- which is not the general way that
normals are expected to interact with a *single* light-source direction. A
better way to describe it would be: a more 'complex' interaction.

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