Notch re-blend in an object model

1. A method performed by a CAD data processing system, comprising:

receiving an object model in a CAD system, the object model including a plurality of features;

creating a blend as part of the object model, using at least one of the features, and removing the used features;

creating a construction body corresponding to the object model;

storing the removed features in the construction body; wherein the removed features include unders for the blend;

modifying at least one of the unders for the blend that is stored in the construction body;

creating a modified blend as part of the object model using at least one of the modified unders without recreating, in the object model, the unders for the blend; and

performing a CAD operation on the object model using the features stored in the construction body.

2. The method of claim 1 , wherein creating the construction body includes creating references between the object model and the construction body, wherein the references include an edge offset relation.

3. The method of claim 1 , wherein the object model is a boundary representation model.

4. The method of claim 1 , wherein the CAD operation includes a re-blend operation using the features stored in the construction body.

5. A CAD system, comprising a processor and accessible memory, the CAD system particularly configured to perform the steps of:

receiving an object model including a plurality of features;

creating a blend as part of the object model, using at least one of the features, and removing the used features;

creating a construction body corresponding to the object model;

storing the removed features in the construction body; wherein the removed features include unders for the blend;

modifying at least one of the unders for the bend that is stored in the construction body;

creating a modified blend as part of the object model using at least one of the modified unders without recreating, in the object model, the unders for the blend; and

performing a CAD operation on the object model using the features stored in the construction body.

6. The CAD system of claim 5 , wherein creating the construction body includes creating references between the object model and the construction body, wherein the references include an edge offset relation.

7. The CAD system of claim 5 , wherein the object model is a boundary representation model.

8. The CAD system of claim 5 , wherein the CAD operation includes a re-blend operation using the features stored in the construction body.

9. A non-transitory computer-readable medium encoded with computer-executable instructions that, when executed, cause a CAD system to perform the steps of:

receiving an object model including a plurality of features;

creating a blend as part of the object model, using at least one of the features, and removing the used features;

creating a construction body corresponding to the object model;

storing the removed features in the construction body; wherein the removed features include unders for the blend;

modifying at least one of the unders for the blend that is stored in the construction body;

creating a modified blend as part of the object model using at least one of the modified unders without recreating, in the object model, the unders for the blend; and

performing a CAD operation on the object model using the features stored in the construction body.

10. The computer-readable medium of claim 9 , wherein creating the construction body includes creating references between the object model and the construction body, wherein the references include an edge offset relation.

11. The computer-readable medium of claim 9 , wherein the object model is a boundary representation model.

12. The computer-readable medium of claim 9 , wherein the CAD operation includes a re-blend operation using the features stored in the construction body.

13. A method performed by a CAD data processing system, comprising:

receiving an object model in a CAD system, the object model including a blend and not including underlying features that define the blend and from which the blend can be re-created;

determining the underlying features;

creating a construction body corresponding to the object model;

storing the underlying features in the construction body;

modifying the underlying features;

creating a modified blend as part of the object model based on the modified underlying features without recreating, in the object model, the underlying features; and

performing a CAD operation on the object model using the features stored in the construction body.

14. The method of claim 13 , wherein the CAD operation includes a re-blend operation using the features stored in the construction body.

15. A method performed by a CAD data processing system, comprising:

receiving an object model in a CAD system, the object model including a plurality of features;

creating a blend as part of the object model, using at east one of the features, and removing the used features;

creating a construction body corresponding to the object model;

storing the removed features in the construction body, wherein the removed features include unders for the blend;

modifying at least one of the unders for the blend that is stored in the construction body;

creating a modified blend as part of the object model using at least one of the modified unders without recreating, in the object model, the unders for the blend;

performing a CAD operation on the features stored in the construction body; and

performing a second CAD operation on the object model using the features stored in the construction body.

16. The method claim 15 , wherein the second CAD operation includes a re-blend operation.

17. A method performed by a CAD data processing system, comprising:

performing a CAD operation on an object model, the object model including a plurality of features;

identifying that a subset of the features represent blends and that the CAD operation has removed geometry required to define the blends;

creating a construction body corresponding to the object model;

storing the removed features in the construction body;

storing the removed features in the construction body, wherein the removed features include unders for the blends;

modifying unders that are stored in the construction body for at least one of the blends;

creating a modified blend as part of the object model using the modified unders without recreating, in the object model, the unders for the blend; and

performing a CAD operation on the object model using the features stored in the construction body.

18. The method of claim 17 , wherein the CAD operation includes a re-blend operation.