smoothstep

smoothなstep

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