Smoothstep from edge0 to edge1 at x.
0.0 if x <= edge0 and 1.0 if x >= edge1 and performs smooth hermite interpolation between 0 and 1 when edge0 < x < edge1. This is useful in cases where you would want a threshold function with a smooth transition.
See Implementation
Smoothstep from edge0 to edge1 at x.