the INTERNET DOMAIN NAME for Uruguay 乌拉圭
Now what I want to find,actually, V is what are these two vectors, let's call them U and V, that correspond to moving a bit in the x direction or in the y direction?
现在我实际上想知道的是，这两个向量是什么，我们称它们为，U和，两者对应的是x方向和y方向一点位移？
Texture coordinates are named (s, t) in order to distinguish them from the (x, y) used for vertex positions (in literature, (u, v) is commonly used instead).
将纹理坐标命名为(s, t)是为了与用于表示顶点位置的(x, y)区分开来(从文字角度来讲，(u, v)更为常用)。
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