角上的数字同样是在三角形带中使用的索引。
The Numbers at the corners are again the indices used in the triangle strip.
然后用三角形带取代三角形,从而减少索引数量。
Next, you reduce the number of indices by using triangle strips instead of triangles.
按惯例,由三角形带中的第一个三角形定义其环绕。
The convention is that a strip's first triangle defines its winding.
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