The following values are defined for the m_ucOrientationWithLoop (orientation between edge and loop) and m_ucOrientationUVWithLoop (orientation between uv_curve and loop) members:
0: Opposite orientation
1: Same orientation
2: Unknown orientation
The m_pUVCurve member must either reference a curve of type kA3DTypeCrvNurbs, or it must be NULL.
Neighbors are connected one to one in a cyclic linked list. No pointer can be repeated in that list.
Pointer to A3DTopoEdge.
Pointer to parametric space curve.
Pointer to list of neighbors.