13 lines
438 B
GLSL
13 lines
438 B
GLSL
// A useful filter, behaves like a smoothly parameterized smooth Heaviside
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// function.
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//
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// Inputs:
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// x input scalar (-inf, inf)
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// t control steepness of step function: --> 0 more linear, --> inf more like
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// Heaviside function (piecewise constant function x<0--> -1 , x>0 --> 1)
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// Returns scalar value
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float smooth_heaviside( float x, float t)
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{
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return (1./(1.+exp(-2.*t*(x)))-1./2.)/(1./(1.+exp(-2.*t*1.))-1./2.);
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}
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