How To Linearize the Depth Value

Here is a GLSL code snippet to convert the exponential depth to a linear value:

float f=1000.0;
float n = 0.1;
float z = (2 * n) / (f + n - texture2D( texture0, texCoord ).x * (f - n));

where:
– f = camera far plane
– n = camera near plane
– texture0 = depth map.

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