缩放uv算法代码如下：
1 half2 ScaleUVsByCenter(half2 uv, float scale)
2 {
3 float2 center = float2(0.5, 0.5);
4 return (uv - center) / scale + center;
5 }
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标签：center,缩放,uv,0.5,Unity,half2,算法 From： https://www.cnblogs.com/jietian331/p/17122079.html