Method and apparatus for displaying CAD geometric object and storage medium storing geometric object display processing programs

• US 6,075,539 A
• Filed: 02/05/1998
• Issued: 06/13/2000
• Est. Priority Date: 02/07/1997
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Tanaka, Yoshiko, Nonaka, Shiro, Yoshinaga, Toshiaki, Ishida, Tomotoshi, Unuma, Munetoshi, Usami, Yoshiaki
• Primary Examiner(s): Nguyen, Phu K.
• Application Number:
  US09/019,195
• Time in Patent Office: 859 Days
• Field of Search: 345/419, 345/421, 345/425, 345/433, 345/112, 345/113, 345/114
• US Class Current: 345/419
• CPC Class Codes: G06T 17/00 Three dimensional [3D] modelling, e.g. data description of 3D objects

Abstract

A geometric object display method and apparatus and a computer-readable storage medium storing a geometric object display process program, capable of displaying the image of a composite geometric object such that the outline of the object can be grasped by the user at an earlier stage. Composite geometric element data input from an input unit is divided into a plurality of geometric element data sets of each part by a sub-grouping unit of a computing unit. The display sequence of the sub-grouped geometric element data is scheduled by a sequence scheduling unit, and the sequenced geometric element data is output by an output unit such as a display device. The outline of a composite geometric object can be grasped at an earlier stage when only a fraction of geometric element data is displayed.

Claims

1. A method of displaying a geometric object represented by a plurality of groups of geometric elements, comprising the steps of:

deriving geometric element data from a data source of geometric elements to be finally displayed; and

in accordance with the derived geometric element data, displaying at least one geometric element contained in each of all the groups to be displayed finally, until 50% of all the geometric elements to be finally displayed is displayed.

2. A method of displaying a geometric object represented by a plurality of groups of geometric elements, comprising the steps of:

inputting geometric element data of the geometric object to be displayed;

sub-grouping the geometric elements contained in each group of the input geometric element data into a plurality of sub-groups;

scheduling the display sequence of the sub-groups of each group; and

outputting the geometric elements in each sub-group in accordance with the scheduled display sequence of each sub-group.

3. A method of displaying a geometric object according to claim 2, wherein said sub-grouping step is performed in accordance with an index of the size of each geometric element in each group.

4. A method of displaying a geometric object according to claim 2, wherein said sub-grouping step is performed in accordance with an index of the distance of each geometric element in each group.

5. A method of displaying a geometric object according to claim 2, wherein said scheduling step is performed in accordance with the order of larger size area of each geometric element in each group.

6. A method of displaying a geometric object according to claim 2, wherein said scheduling step is performed in accordance with the order of nearer distance, to a view point, of each geometric element in each group.

7. A method of displaying a plurality of three-dimensional geometric objects each containing faces and edges as geometric elements, comprising the steps of:

deriving geometric element data from a data source of geometric elements to be displayed; and

displaying at least one face or edge constituting each of all the three-dimensional geometric objects to be displayed finally, until 50% of all the three-dimensional geometric objects to be finally displayed is displayed.

8. A method of displaying a plurality of three-dimensional geometric objects in the unit of geometric element and sequentially in the order of larger volume, comprising the steps of:

deriving geometric element data from a data source of geometric elements to be displayed; and

displaying at least one face or edge as the geometric element constituting each of all the three-dimensional geometric objects to be displayed finally, until the three-dimensional geometric object of the largest volume is displayed.

9. An apparatus for displaying a composite geometric object represented by a plurality of groups of geometric elements, comprising:

a memory for storing data of groups of geometric elements supplied from a data source of the geometric elements of the composite geometric object; and

display means connected to said memory for reading the geometric element data from said memory and processing the read geometric element data in such a manner that at least geometric element contained in each of all the groups to be displayed finally, is displayed until 50% of all the geometric elements to be finally displayed is displayed.

10. An apparatus for displaying a composite geometric object represented by a plurality of groups of geometric elements, comprising:

a memory for storing geometric element data of the composite geometric object;

sub-grouping means for reading the geometric element data from said memory and sub-grouping the geometric elements of each group into a plurality of sub-groups;

scheduling means for determining the display sequence of the sub-groups of each group in accordance with a predetermined condition; and

outputting means for outputting the geometric elements of each sub-group in accordance with the display sequence of each sub-group determined by said scheduling means.

11. An apparatus according to claim 10, wherein said sub-grouping means sub-groups in accordance with an index of the size of each geometric element in each group.

12. An apparatus according to claim 10, wherein said sub-grouping means sub-groups in accordance with an index of the distance of each geometric element in each group.

13. An apparatus according to claim 10, wherein said scheduling means determines a priority display sequence in accordance with the order of larger size area of each geometric element in each group.

14. An apparatus according to claim 10, wherein said scheduling means determines a priority display sequence in accordance with the order of nearer distance, to a view point, of each geometric element in each group.

15. An apparatus for displaying a plurality of three-dimensional geometric objects, comprising:

a memory for storing geometric element data of the plurality of three-dimensional geometric objects; and

display processing means for reading the geometric element data from said memory and processing the read geometric element data in such a manner that at least one face or edge as the geometric element constituting each of all the three-dimensional geometric objects to be displayed finally, is displayed until 50% of all the three-dimensional geometric objects to be finally displayed is displayed.

16. An apparatus for displaying a plurality of three-dimensional geometric objects in the order of larger volume, comprising:

a memory for storing data of geometric elements constituting each of the plurality of three-dimensional geometric objects; and

display processing means for reading the geometric element data from said memory and processing the read geometric element data in such a manner that at least one face or edge as the geometric element constituting each of all the three-dimensional geometric objects to be displayed finally, until the three-dimensional geometric object of the largest volume is displayed.

17. A computer readable storage medium storing a program which the computer executes to perform a process of displaying a geometric object represented by a plurality of groups of geometric elements, said program comprising:

programming means for storing data of the groups of geometric elements to be displayed, in a memory; and

programming means for processing the data stored in the memory in such a manner that at least one geometric element contained in each of all the groups to be displayed finally, is displayed until 50% of all the geometric elements to be finally displayed is displayed.

18. A computer readable storage medium storing a program which the computer executes to perform a process of displaying a composite geometric object represented by a plurality of groups of geometric elements, said program comprising the steps of:

storing data of the groups of geometric elements to be displayed, in a memory;

sub-grouping the geometric elements contained in each group of the data stored in the memory, into a plurality of sub-groups;

scheduling the display sequence of the sub-groups of each group; and

outputting the geometric elements in each sub-group in accordance with the scheduled display sequence of each sub-group.

19. A computer readable storage medium according to claim 18, wherein said sub-grouping step is performed in accordance with an index of the size of each geometric element in each group.

20. A computer readable storage medium according to claim 18, wherein said sub-grouping step is performed in accordance with an index of the distance of each geometric element in each group.

21. A computer readable storage medium according to claim 18, wherein said scheduling step is performed in accordance with the order of larger size area of each geometric element in each group.

22. A computer readable storage medium according to claim 18, wherein said scheduling step is performed in accordance with the order of nearer distance, to a view point, of each geometric element in each group.

23. A computer readable storage medium storing a program which the computer executes to perform a process of displaying a plurality of three-dimensional geometric objects each containing faces and edges as geometric elements, said program comprising:

programming means for deriving geometric element data from a data source of geometric elements of the three-dimensional geometric objects; and

programming means for processing the derived geometric element data in such a manner that at least one face or edge constituting each of all the three-dimensional geometric objects to be displayed finally, is displayed until 50% of all the three-dimensional geometric objects to be finally displayed is displayed.

24. A computer readable storage medium storing a program which the computer executes to perform a process of displaying a plurality of three-dimensional geometric objects in the order of larger volume, said program comprising the steps of:

deriving geometric element data from a data source of geometric elements to be displayed; and

displaying at least one face or edge as the geometric element constituting each of all the three-dimensional geometric objects to be displayed finally, until the three-dimensional geometric object of the largest volume is displayed.

25. A method of displaying a geometric object with a computer by sequentially displaying a plurality of geometric elements of a display object divided into a plurality of groups, comprising the steps of:

storing data of all the grouped geometric elements of the display object in a memory; and

processing the geometric element data stored in the memory to sequentially display the geometric elements of the display object of each group so that a display contains at least one geometric element of each group, when a designated display completion degree of the display object is obtained.

26. A method according to claim 25, wherein the designated display completion degree of the display object is determined in accordance with a parameter including the number of parts of the display object, the number of faces of each part, and the processing speed of the computer.

27. A method according to claim 25, wherein the designated display completion degree of the display object is represented by a display completion of 50% of all the geometric elements of the display object.

28. A method of displaying a geometric object with a computer by sequentially displaying a plurality of three-dimensional geometric objects as a display object in the unit of geometric object including a face and an edge, comprising the steps of:

storing data of geometric elements of each three-dimensional geometric object of the display object in a memory; and

processing the geometric element data stored in the memory so that a display contains at least one face or edge of each of all three-dimensional geometric objects constituted of faces and edges, when a designated display completion degree of the display object displayed by sequentially displaying the geometric elements of each three-dimensional geometric object, is obtained.

29. A computer readable storage medium storing a program which the computer executes to perform a process of displaying a composite geometric object as a computer aided design display object represented by a plurality of geometric elements divided into a plurality of groups, said program comprising:

programming means for storing CAD geometric data of all the grouped geometric elements of the display object in a memory; and

programming means for processing the CAD geometric data stored in the memory to sequentially display the geometric elements of the display object of each group so that a display contains at least one geometric element of each group, when a designated display completion degree of the display object is obtained.

30. A storage medium according to claim 29, wherein the designated display completion degree of the display object is determined in accordance with a parameter including the number of parts of the display object, the number of faces of each part, and the processing speed of the computer.

31. A storage medium according to claim 29, wherein the designated display completion degree of the display object is represented by a display completion of 50% of all the geometric elements of the display object.

32. A storage medium storing a program which a computer executes to perform a process of displaying a plurality of three-dimensional geometric objects as a display object in the unit of a geometric element including a face and an edge, said program comprising:

programming means for storing CAD geometric data representative of geometric elements of each three-dimensional geometric object of the display object in a memory; and

programming means for processing the CAD geometric element data stored in the memory so that a display contains at least one face or edge of each of all three-dimensional geometric objects constituted of faces and edges, when a designated display completion degree of the display object displayed by sequentially displaying the geometric elements of each three-dimensional geometric object, is obtained.