Cost of two-sided lighting ?

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Lionel Maiaux (maiaux++at++quartz.corys.fr)
Thu, 7 Sep 1995 18:53:23 +0100

Hi,

I read several times that two-sided lighting (set with pfLModelTwoSide) is
expensive (I suppose the extra-cost depend from IRIS or OPEN GL light model).

Is it more expensive to draw 1 face with two-sided lighting and backface
culling off, or to draw 2 oposite faces whith one-sided lighting and backface
culling on to get the same results ?

If yes, on which stage of the pipeline and why ???

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