Get the data defining this B-spline.
| Name | Type | Description |
| Poles | Double | Input/output Double that specifies the poles of the B-Spline. |
| KnotsU | Double | Input/output Double that specifies the knots of the B-Spline in U. |
| KnotsV | Double | Input/output Double that specifies the knots of the B-Spline in V. |
| Weights | Double | Input/output Double that specifies the B-spline's weights. |