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取自ShaderToy,一个用的比较多的mod289随机算法。分两个pass,首先在第一个pass对输入的MainTexture做随机扰动。随后在第二个pass将主纹理同noiseTexture做混合。混合方式可以根据需要有多种变化。比如可以对ui文字、sprite做不同处理。
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