Linearly interpolates between two values within the visual shader graph. Translates to [code]mix(a, b, weight)[/code] in the shader language. A type of operands and returned value. A floating-point scalar. A 2D vector type. The [code]a[/code] and [code]b[/code] ports use a 2D vector type. The [code]weight[/code] port uses a scalar type. A 3D vector type. The [code]a[/code] and [code]b[/code] ports use a 3D vector type. The [code]weight[/code] port uses a scalar type. A 4D vector type. The [code]a[/code] and [code]b[/code] ports use a 4D vector type. The [code]weight[/code] port uses a scalar type. Represents the size of the [enum OpType] enum.