ce89d7949c
This patch optimizes the Gabor noise standard deviation estimation by computing the upper limit of the integral as the frequency approaches infinity, since the integral is mostly constant for the relevant frequency range. The limits are 0.25 for the 2D case and 1 / 4 * sqrt2 for the 3D case. This also improves normalization for low frequencies, possibly due to the effect of windowing. Thanks to Charlie Jolly for spotting the optimization.
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