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My world matrix scales an item, and the normals are scaled as well. How can I prevent this from affecting my lighting?

April 26, 2017lighting matrix normals scaled scales world

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My world matrix scales an item, and the normals are scaled as well. How can I prevent this from affecting my lighting?

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This can be achieved in one of two ways: 1. Scale the length of your normals by the reciprocal of the scaling factor. For example, if an object is scaled to 5 times it’s size, then multiply the normals by 1/5, or 0.2. 2. Set the D3DRENDERSTATE_NORMALIZENORMALS to TRUE. This will cause normals to be normalized (set to a length of 1.0) after transformation into camera space. Note that this can be computationally expensive.