OpenGL

      Unlike an attribute that is set on each vertex, a uniform keeps the same value for all vertices until we change it again.   glMultMatrix*(已廢棄）把一個新的4*4矩陣和當前矩陣Ｃ相乘，ＣＭ，， 默認的相機位於原點，指向ｚ軸負方向，朝上的向量是（０，１

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