that inconsistent normal direction is searched by geometric calculation.
| Name | Value | Description |
|---|---|---|
| RF_FILL_HOLE_PLANE | 1 | Indicating that hole loop is filled by linear interpolation. |
| RF_FILL_HOLE_SMOOTH | 2 | Indicating that hole loop is filled by quadric interpolation. |
| RF_FILL_HOLE_CURVATURE | 3 | Indicating that hole loop is filled by cubic interpolation. |