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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