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flaw of dxt5_nm

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when we sample normal map from pixel shader, we get interpolated vector, its length is always shorter than 1 if we have set linear filter, right?

for regular normalmap, we just re-normalize it, but for normalmap compressed as dxt5_nm, we have only xy channel and have to do somthing like z=sqrt(1-x*x-y*y),

so I guess z is always greater than it should be, because xy vector is always shorter than it should be.

am I right?

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