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並前往https://stackoverflow.com/questions/19795123/glnormal-opengl-square-example/19795627

glNormal opengl - Square example - Stack Overflow

When you need to calculate the normal of a quad you need to calculate the cross-product of your quad's 4 vertices. A = (1, 1, -1) B = (1, 1, 1) C = (-1, 1, ...

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查詢 「glNormal」的人也找了：

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