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The $Z$ of NDC space is related to $1/Z_\text{view}$ but not the same. With a typical projection matrix, they're related by an affine remapping, $$ Z_\text{NDC} = a \, \frac{1}{Z_\text{view}} + b $$ where $a, b$ are some constants related to the near and far planes. So, in general you wouldn't be able to substitute $Z_\text{NDC}$ for $1/Z_\text{view}$ in ...


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