smoothstep.cpp

#include <cmath>
#include <cstdio>

double smoothstep(double low, double high, double factor){
    auto k = std::fmin(1, std::fmax(0, (factor - low)/(high - low)));
    return k*k*(3-2*k);
}


int main(){
    for(double i = 0.0; i < 1.0; i += .1){
        std::printf("%f\n", smoothstep(0.0, 1.0, i));
    }
}