SMOOTHSTEP

THE BOX'S MAIN HELP:

This function returns 0 if X < A; 1 if X >= B;
otherwise a smooth S-curve interpolation between 0 and 1.

A (input):

This must be a scalar.
The minimum value, zero is returned if X < A.

B (input):

This must be a scalar.
The maximum value, one is returned if X >= B.

X (input):

This is the edge value. It must be a scalar.

OUT (output):

This function returns 0 if X < A; 1 if X >= B;
otherwise a smooth S-curve interpolation between 0 and 1.