Computer graphics processing and selective visual display system – Computer graphics processing – Three-dimension
Reexamination Certificate
1999-02-24
2002-02-12
Zimmerman, Mark (Department: 2671)
Computer graphics processing and selective visual display system
Computer graphics processing
Three-dimension
C345S420000, C345S958000, C382S102000
Reexamination Certificate
active
06346941
ABSTRACT:
BACKGROUND OF THE INVENTION
1) Field of the Invention
This invention relates to an interference check result displaying method and an interference check result displaying apparatus as well as a computer-readable recording medium having an interference check result displaying program recorded thereon suitable for use to display a result of interference checking processing between a plurality of objects constructed in a virtual three-dimensional space set on a computer.
2) Description of the Related Art
In recent years, use of a design technique which employs three-dimensional CAD in designing of equipments, apparatus and so forth has been increasing. In designing wherein such three-dimensional CAD is employed, it is essentially required to perform a check of interference between objects constructed in a virtual three-dimensional space set on a computer before the designed objects are actually manufactured for trial.
An interference checking function in three-dimensional CAD requires much time for processing. Therefore, the following method is used. In particular, an interference check is performed in a stationary condition of object models of an interference check subject, and after completion of the interference checking processing, a result of it is displayed on a monitor or the like for confirmation. Further, where an object model rotates or moves, a movement of the object is defined in advance, and an interference check is performed for each predetermined movement amount of the object model. After all interference checking processing is completed, a result of the processing is displayed on a monitor or the like for confirmation.
For a technique for confirmation of a result of an interference check, only a technique is used wherein a shared or common space (volume) between object models between which interference is found is displayed on a monitor or the like. Further, for a method of displaying a result of an interference check, particularly a technique of displaying an outer profile of a shared space by line drawing or in a different color, another technique of displaying only a shared space and some other techniques are used.
FIG. 22
illustrates a known interference check result displaying method and illustrates a screen displaying condition of an interference portion displaying apparatus disclosed in Japanese Patent Laid-Open No. 54792/1997. Referring to
FIG. 22
, according to the known interference check result displaying method illustrated, an interference portion (shared space) between object models is displayed in a screened display. If it is discriminated that the interference portion is so small that it is very difficult to confirm the interference part, a region of a predetermined shape surrounding the interference part such as a circle, a rectangular parallelepiped or a polygon is plotted to display the interference part centered at an interference part representative point (one of the point of the center of gravity of the interference part, the point of the center of the figure and an arbitrary apex) on a monitor
1
,
000
, and the interference portion is displayed in an enlarged scale (refer to reference numeral
1
,
001
of
FIG. 22
) or child screens
1
,
002
of the interference part as viewed in a plurality of directions (a two-dimensional screen as viewed from the front, a side or the top) are displayed (refer to the right upper side of FIG.
22
). Further, where two or more interference portions are involved, a result of an interference check is displayed in a balloon display in accordance with the necessity.
In recent years, as a method of an interference check, a very high speed interference checking system has become used wherein an object model is represented as a plurality of planar surface polygons and, as a result of interference checking processing, interference points or nearest points are calculated on grating points, sides or polygon faces of the polygons, and when contact/interference occurs, the interference points or nearest points are returned as a check result.
By such a high speed interference checking method as described above, movement or rotation of an object, an interference check and displaying of a result of the interference check can be performed in approximately several cycles or several tens cycles per one second. Consequently, operations which have not conventionally been performed very much because much time is required for interference checking processing such as an operation of performing an interference check while moving or rotating an object arbitrarily to confirm an interfering portion on the real time basis have begun to be performed.
In order to confirm a condition of an interfering portion where the positional relationship between object models varies and is displayed every time, an interference check result displaying method which allows easy confirmation of an interference condition between object models and is suitable for a system having a displaying function which allows high speed switching is demanded.
However, the interference check result displaying method described above is a result displaying method as one of techniques for determining an interference portion (shared space) between object models and has been invented from the point of view of how to facilitate observation of a shared space determined as a result of an interference check. Therefore, the interference check result displaying method has a subject to be solved in that, when an interference check is performed while an object model is moved or rotated arbitrarily in a virtual three-dimensional space and a result of the interference checking processing is displayed on the real time basis, the position and so forth of an interfering portion displayed on the display unit cannot be discriminated readily.
Also a displaying method is demanded which allows, when a plurality of interference portions (representative points) are present and a particular one of the representative points is designated, the designated representative point to be distinguished on the display from the other representative points or allows a plurality of representative points to be confirmed successively. Further, where a plurality of representative points are present, since the possibility is high that representative points other than a designated particular representative point may be hidden and blocked by the displayed object models, also an interference check result displaying method which allows easy confirmation of representative points hidden by such object models is demanded.
Also a displaying method is demanded which is suitable for substantially real time supervision not of interference but of variation of the positional relationship between particular objects when any of the objects is moved or rotated.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an interference check result displaying method and an interference check result displaying apparatus as well as a computer-readable recording medium having an interference check result displaying program recorded thereon which are improved to allow easy recognition of a rough position and a precise position of a representative point at which contact/interference occurs.
It is another object of the present invention to provide an interference check result displaying method and an interference check result displaying apparatus as well as a computer-readable recording medium having an interference check result displaying program recorded thereon which are improved to allow, also where such a real time performance as to perform an interference check while an object is moved or rotated, easy recognition of a rough position and a precise position of a representative point at which contact/interference occurs.
It is a further object of the present invention to provide an interference check result displaying method and an interference check result displaying apparatus as well as a computer-readable recording medium having an interference check result displaying program recorded thereon which are impro
Arita Yuichi
Nozaki Naoyuki
Nguyen Kimbinh T.
Staas & Halsey , LLP
Zimmerman Mark
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