Calculates a scalar SmoothStep function within the visual shader graph. Translates to [code]smoothstep(edge0, edge1, x)[/code] in the shader language. Returns [code]0.0[/code] if [code]x[/code] is smaller than [code]edge0[/code] and [code]1.0[/code] if [code]x[/code] is larger than [code]edge1[/code]. Otherwise the return value is interpolated between [code]0.0[/code] and [code]1.0[/code] using Hermite polynomials.