smoothstep

一回微分しても連続

$ -2t^3 + 3t^2

code:cpp

float smoothstep(float a, float b, float t) {

float x = saturate((t - a) / (b - a));

return x * x * (3.0 - 2.0 * x);

}

See also:

https://gyazo.com/9198446ee1cfe8df5e7919414911e16c