* Returns 1.0 if the given value is positive or zero, and -1.0 if it is negative. This is similar to the GLSL * built-in function <code>sign</code> except that returns 1.0 instead of 0.0 when the ...
* Approxiamtes atan over the range [0, 1]. Safe to flip output for negative input. * Based on Michal Drobot's approximation from ShaderFastLibs, which in turn is based on * "Efficient approximations ...
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