var SmoothStep = function (x, min, max){ 
if (x <= min) { 
return 0; 
} 
if (x >= max) { 
return 1; 
} 
x = (x - min) / (max - min); 
return x * x * (3 - 2 * x); 
} 
; 
module.exports = SmoothStep;