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我正在尝试使用立方体贴图获得天空盒效果。天空盒被绘制为单个批次的六个 GL_QUADS。然后使用 glTexCoord3f 手动对每个面进行纹理化。但是对于每个顶点，必须指定一个向量来指向天空盒的那个角。这是我卡住的地方。如何指定此向量？