Create an intermediate curve between two curves.

Input parameters:

1. Ca → Curve to tween from.
2. Cb → Curve to tween to.
3. Fc → Tween factor. A tween factor of 0.0 returns the first curve while a factor of 1.0 returns the second curve.
4. Md → Method used to create the tween curve.
   • 0 → IsoCurve
   • 1 → Mean Weights

Output parameters:

1. Tc → Resulting tween curve.