To add a projection to a NURBS surface:
1. In the desired view, draw a 2D object or NURBS curve on top of a NURBS surface.
The 2D object or NURBS curve must be closed and planar.
2. Click the Project tool from the 3D Modeling tool set.
3. Select Add from the Tool bar. Select the appropriate direction mode so that the projection direction intersects the NURBS surface (Add Upward, Add Downward, or Add Both Directions).
The projection direction must intersect with the NURBS surface, or no projection is created.
4. Click on the object to add; the projection direction is indicated by a red arrow. Click on the NURBS surface.
The object’s projection is added to the NURBS surface at the point of intersection, creating a generic solid.
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