Method and system for interactively determining and displaying geometric relationship between three dimensional objects based on predetermined geometric constraints and position of an input device

• US 6,323,859 B1
• Filed: 10/18/1999
• Issued: 11/27/2001
• Est. Priority Date: 05/08/1995
• Status: Expired due to Term

• Current Assignee: Autodesk, Inc.
• Original Assignee: Autodesk, Inc.
• Inventors: Gantt, Brian D.
• Primary Examiner(s): Jankus, Almis R.
• Assistant Examiner(s): MANCUSO, HUEDUNG XUAN CAO
• Application Number:
  US09/419,539
• Time in Patent Office: 771 Days
• Field of Search: 345/419, 345/433, 345/437, 345/438, 345/439
• US Class Current: 345/419
• CPC Class Codes: G06F 2111/04 Constraint-based CAD
• CPC Class Codes: G06F 2113/14 Pipes
• CPC Class Codes: G06F 30/00 Computer-aided design [CAD]
• CPC Class Codes: G06T 19/20 Editing of 3D images, e.g. changing shapes or colours, aligning objects or positioning parts
• CPC Class Codes: G06T 2219/2004 Aligning objects, relative positioning of parts
• CPC Class Codes: G06T 2219/2016 Rotation, translation, scaling

Abstract

A system and method of interactively determining and displaying geometric relationships between three dimensional (3D) objects includes the steps of and apparatus for detecting the position of an input device, moving a selected 3D graphic object relative to a graphic pointing symbol in a 3D representation based on position of the input device, determining if the selected graphic object is moved to occlude an underlying 3D graphic object, and positioning and displaying the selected graphic object with respect to the underlying graphic object according to predetermined geometric constraints and the position of the input device. The system and method further dynamically moves and displays the selected graphic object according to movement of the input device and the predetermined geometric constraints while the selected graphic object occludes the underlying graphic object. The selected graphic object clings to the underlying graphic object, and is moved about the underlying graphic object corresponding to movement of the input device. The selected object may be a logical object, such as a logical camera or light source. For example, a camera object is placed based on a geometric element, and the display is changed to the viewpoint of the camera. The operator then interactively changes the display simply by moving the input device, where the display is automatically updated based on movement of the camera object.

Claims

1. A method of interactively determining geometric relationships between objects in a computer-implemented graphics system, comprising:

(a) moving a first graphics object displayed by the computer-implemented graphics system;

(b) determining if the first graphic object is moved close to a second graphic object;

(c) if the first graphic object has been moved close to the second graphic object, dynamically altering a position of the first graphic object to agree with assembly specifications with respect to the second graphic object according to predetermined geometric constraints and the position of the input device.

2. The method of claim 1, further comprising dynamically moving the first graphic object after it has been dynamically altered to agree with the assembly specifications according to movement of the input device and the predetermined geometric constraints while the first graphic object remains close to the underlying graphic object.

3. The method of claim 1, wherein the dynamically altering step further comprise the steps of clinging the first graphic object to the second graphic object, and rotatably moving and displaying the first graphic object about the second graphic object corresponding to movement of the input device.

4. The method of claim 1, wherein closeness is based on a predefined geometric graphic element associated with the second graphic object.

5. The method of claim 1, wherein the dynamically altering step includes the step of orienting the first graphic object according to a tangential angle with respect to the second graphic object at a cling point.

6. The method of claim 1, wherein the dynamically altering step includes the step of positioning the first graphic object at a predetermined offset relative to a cling point between the first graphic object and the second graphic object.

7. The method of claim 1, wherein the second graphic object includes at least one graphic constraint element, and the dynamically altering step further comprises the step of aligning the first graphic object with the second graphic object according to the graphic constraint element of the second graphic object.

8. The method of claim 1, wherein the first graphic object and the second graphic object each have a graphic constraint element, and the dynamically altering step comprises the step of aligning the first graphic object with the second graphic object by aligning the respective graphic constraint elements.

9. A computer-implemented graphics system for interactively determining geometric relationships between objects, comprising:

(a) means, performed by a processor, for moving a first graphics object displayed by the computer-implemented graphics system;

(b) means, performed by a processor, for determining if the first graphic object is moved close to a second graphic object;

(c) means, performed by a processor, for dynamically altering a position of the first graphic object to agree with assembly specifications with respect to the second graphic object according to predetermined geometric constraints and the position of the input device, if the first graphic object has been moved close to the second graphic object.

10. The system of claim 9, further comprising means for dynamically moving the first graphic object after it has been dynamically altered to agree with the assembly specifications according to movement of the input device and the predetermined geometric constraints while the first graphic object remains close to the underlying graphic object.

11. The system of claim 9, wherein the means for dynamically altering further comprises means for clinging the first graphic object to the second graphic object, and for rotatably moving and displaying the first graphic object about the second graphic object corresponding to movement of the input device.

12. The system of claim 9, wherein closeness is based on a predefined geometric graphic element associated with the second graphic object.

13. The system of claim 9, wherein the means for dynamically altering includes means for orienting the first graphic object according to a tangential angle with respect to the second graphic object at a cling point.

14. The system of claim 9, wherein the means for dynamically altering includes means for positioning the first graphic object at a predetermined offset relative to a cling point between the first graphic object and the second graphic object.

15. The system of claim 9, wherein the second graphic object includes at least one graphic constraint element, and the means for dynamically altering further comprises means for aligning the first graphic object with the second graphic object according to the graphic constraint element of the second graphic object.

16. The system of claim 9, wherein the first graphic object and the second graphic object each have a graphic constraint element, and the means for dynamically altering comprises means for aligning the first graphic object with the second graphic object by aligning the respective graphic constraint elements.

17. An article of manufacture storing software for execution by a processor in a computer-implemented graphics system to perform method of interactively determining geometric relationships between objects, the method comprising the steps of:

(a) moving a first graphics object displayed by the computer-implemented graphics system;

(b) determining if the first graphic object is moved close to a second graphic object;

(c) if the first graphic object has been moved close to the second graphic object, dynamically altering a position of the first graphic object to agree with assembly specifications with respect to the second graphic object according to predetermined geometric constraints and the position of the input device.

18. The system of claim 17, further comprising dynamically moving the first graphic object after it has been dynamically altered to agree with the assembly specifications according to movement of the input device and the predetermined geometric constraints while the first graphic object remains close to the underlying graphic object.

19. The system of claim 17, wherein the dynamically altering step further comprise the steps of clinging the first graphic object to the second graphic object, and rotatably moving and displaying the first graphic object about the second graphic object corresponding to movement of the input device.

20. The system of claim 17, wherein closeness is based on a predefined geometric graphic element associated with the second graphic object.

21. The system of claim 17, wherein the dynamically altering step includes the step of orienting the first graphic object according to a tangential angle with respect to the second graphic object at a cling point.

22. The system of claim 17, wherein the dynamically altering step includes the step of positioning the first graphic object at a predetermined offset relative to a cling point between the first graphic object and the second graphic object.

23. The system of claim 17, wherein the second graphic object includes at least one graphic constraint element, and the dynamically altering step further comprises the step of aligning the first graphic object with the second graphic object according to the graphic constraint element of the second graphic object.

24. The system of claim 17, wherein the first graphic object and the second graphic object each have a graphic constraint element, and the dynamically altering step comprises the step of aligning the first graphic object with the second graphic object by aligning the respective graphic constraint elements.