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[DirectX October 2006 Documentation] Face and Vertex Normal Vectors (43.1115260342179%)
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[DirectX 6 Programmer's Reference] Face and Vertex Normal Vectors (32.2916666666667%)
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[DirectX 7 Programmer's Reference] Face and Vertex Normal Vectors (32.2916666666667%)
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[DirectX 8.1 C/C++ Programmer's Reference] Face and Vertex Normal Vectors (32.0622119815668%)
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