Splitting or Trimming NURBS Surfaces

The Project tool projects a 2D object or NURBS curve onto a NURBS surface, and then splits the NURBS surface or trims the NURBS surface according to the region selected. This allows nonlinear splitting or trimming of surfaces to create different shapes or cut a hole in an object.

 

Mode	Description
Project and Split	Splits a NURBS surface with a projection
Project and Trim	Trims a NURBS surface with a projection
Project and Add	Adds a projection to a NURBS surface
Project and Add Upward	In Project and Add mode, adds the projection in the profile plane normal direction
Project and Add Downward	In Project and Add mode, adds the projection in the opposite direction from the profile plane normal direction
Project and Add Both Directions	In Project and Add mode, adds the projection in both the profile plane normal direction and the opposite direction

Project and Split

 

To split a NURBS surface with a projection:

1.	In the desired view, draw a 2D object or NURBS curve on top of a NURBS surface.

If the object to be projected is an open NURBS curve or open 2D object, both end points must be outside the NURBS surface.

2.	Click the Project tool from the 3D Modeling tool set, and then select Project and Split from the Tool bar.

3.	Click on the splitting object, and then click on the NURBS surface.

The splitting object is projected onto the NURBS surface, resulting in a group of NURBS surfaces.

Project and Trim

 

To trim a NURBS surface with a projection:

1.	In the desired view, draw a 2D object or NURBS curve on top of a NURBS surface.

If the object to be projected is an open NURBS curve or an open 2D object, both end points must be outside the NURBS surface.

2.	Click the Project tool from the 3D Modeling tool set, and then select Project and Trim from the Tool bar.

3.	Click on the trimming object, and then click on the NURBS surface. The cursor changes into the pointing hand cursor. Click on the side of the intersection to be trimmed away.

The trimming object is projected onto the NURBS surface, and the region selected to be trimmed away is removed from the NURBS surface at the point of intersection.

Project and Add

 

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 Project and Add from the Tool bar. Select the appropriate direction mode so that the projection direction intersects the NURBS surface (Project and Add Upward, Project and Add Downward, or Project and 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 Rib

The Project and Add mode of the Project tool can be used to create ribs.

 

To create a rib:

1.	In the desired view, draw a 2D object or NURBS curve on top of a solid.

The 2D object or NURBS curve must be closed and planar.

2.	Click the Project tool from the 3D Modeling tool set, and then select Project and Add from the Tool bar.

3.	Select the appropriate projection direction mode.

4.	Click on the object to add, and then click on the solid.

The rib profile is projected until it meets the next surface it encounters. The profile is trimmed at the extremities automatically.