**Surfaces** | S | Set of surfaces to tween between | Surface |

**Factor** | F | Tween factor (0.0 = Surface at S, 1.0 = Surface at S +1) | Number |

**Weighted** | W | If True, tween distribution is weighted by the input surface set and the tween path curvature | Boolean |

**Loopback** | L | If True, allow the tween path to continue from the end back to the start as a closed loop | Boolean |

**Degree** | D | Curvature degree of the tween path, degree should be a positive odd number | Integer |

**Interpolation Type** | I | Determines how the tween path is interpolated
0 = Linear
1 = Chord
2 = Square Root
3 = Uniform | Integer |

**Refit** | R | Optional Refit match method.
(No Integer or 0 = Off, Integer greater than 0 = On and surface degree of refit)
If an integer greater than zero, Refit match method is used if possible. When input surfaces are refit their control points are redistributed, added to, and removed from based on the surfaces curvature and the input integer degree, while trying to maintain their shapes. Refit results in tighter shaped tweens, with curvature based control point distribution. | Integer |

**Point Sample** | P | Optional Point Sample match method.
(No Integer or 0 = Off, Integer greater than 0 = On and amount of sample points)
If an integer greater than zero, Point Sample match method is used. When input surfaces are sampled their control points are recreated by equally dividing the surface by the input integer point count. Point Sample results in looser shaped tweens, with uniform control point distribution. | Integer |