相应地，如果您需要将立方体正面的左下角映射到纹理的左下角，必须将纹理坐标(0,1)指派给顶点0。

Accordingly, if you want to map the lower left corner (-1, -1) of the cube's front face to the texture's lower left corner, you must assign the texture coordinates (0, 1) to vertex 0.

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通过这样的方式，也就隐式地将立方体的外部定义为正面，而将内部作为背面。

This way, I implicitly defined the outside of the cube as the front face and the inside as the back face.

youdao

如果立方体有一个半掩的盖子，您同时可看到其正面和背面，此时同时渲染两面的操作非常有用。

The latter is useful if the cube has a half-open lid and you can see both inside and outside at the same time.

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