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Problem with directional lighting when I scale

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Hi All, I have built a renderer, with only directional lighting (i.e., 0.0f in the W coordinate of the position of two directinal lights). When I render a model (I have tried some) and scale it down by 0.1f in all coordinates it becomes more lighted or bright. I have tried many other scale sizes, but in 0.1f there is a brightness popping. Why is this happenning and How can it be solved?

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when you scale teh matrix, all the normals will be scaled as well, and that affects lighting.


should do the trick.

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