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.

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。

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Each face is an equilateral triangle and three faces meet at each vertex.

每一个面是正三角形并且于每一个顶点处有三个面相交。

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This paper describes the error in focimeters, the principle of selection on curvature of inside face for vertex power of standard lenses and the method for measuring them.

本文叙述了焦度计的误差，顶焦度标准镜片内表面弯度的选择原则，以及标准镜片的测量方法等。

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