Sets the definition data of the spline.
| Name | Type | Description |
| Order | Long | Input Long that specifies the order of the spline. |
| Poles | Double | Input/output Double that specifies the poles of the B-Spline. |
| Knots | Double | Input/output Double that specifies the knots of the B-Spline. |
| Weights | Double | Input/output Double that specifies the B-spline's weights. |
| IsPeriodic | Boolean | Input Boolean that specifies whether the B-Spline is periodic. |