JP2006301832A - Graphic processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a workload for selecting an interfering section which an operator really wants to know. <P>SOLUTION: This graphic processing method is provided to make a graphic processor having a storage device, a processor and a display device process a stereoscopic graphic in a three-dimensional virtual space. The processing of the processor executes a step for detecting an interfering section where stereoscopic graphics are overlapped, a step for acquiring an interfering mode attribute value from the stereoscopic graphic in the post-processing of the interfering section after detecting the interfering section, a step for determining whether to interfere with a part predetermined by referring to an attribute matching table where the statuses of the attributes of the stereoscopic graphic are stored, a processing step for preparing a candidate region to be ignored even when any interference is generated, a determination step for determining whether to ignore the interfering section and a step for registering the determination result as a flag in an interference pair list where the interfering statuses of the stereoscopic graphic are registered so that it is possible to classify interfering sections by estimating them from information added in advance to the stereoscopic graphic. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a graphic processing method, and more particularly to graphic processing in a three-dimensional graphic processing apparatus, so-called three-dimensional CAD system.

  A three-dimensional figure is created by superimposing a plurality of three-dimensional parts such as bolts and nuts using a CAD system. In this case, there are many cases where parts overlap each other in a figure made up of a plurality of parts drawn by a CAD system.

  For example, as disclosed in Japanese Patent Application Laid-Open No. 2004-145739 (Patent Document 1), the bolt figure and the tapped hole figure can be quickly arranged at a position where the effective screw allowance is adapted to greatly increase the drawing efficiency. In order to improve, a CAD system is known in which a bolt figure and a tapped hole figure having an effective screw allowance are automatically determined according to a predetermined design condition.

  When a plurality of three-dimensional data are displayed in an overlapped manner in the CAD system of the prior art, as shown in FIG. 2, for the processing of the overlapping part, the interference part is shared from the interference pair list stored in the storage device in advance. Names of solid figures, for example, solid data A and B, and a list of interference volume (interference volume) between the solid data (FIG. 2 (1)), and a graphic including the interference part 20 (FIG. 2 (2)) Is displayed on a display device.

  As shown in FIG. 3, when displaying the screw component 31 and the mechanical component 32 which couple | bonds it, an interference part is detected. Some of these figures may not be displayed as interference. For example, as shown in FIG. 3 (1), the screw component 31 has a spiral shape, which functions by meshing with the spiral shape of the counterpart mechanical component 32. However, when these parts 31 and 32 are three-dimensionally formed on a three-dimensional CAD, as shown in FIGS. 3 (2) and 3 (3), the spiral shape is omitted and the shape is represented as a simple cylindrical shape.

JP 2004-145739 A

  For example, in the display of a screw component as shown in FIG. 3, the cylindrical shape of the screw component may cause interference that is not possible. For this reason, interference that is truly desired to be detected and interference that cannot be found are listed in random order in the above-described list of interference pairs, and it takes time for the CAD operator to determine the interference.

  An object of the present invention is to provide a graphic processing apparatus that can reduce a work burden for selecting an interference site that an operator really wants to know.

The present invention provides a graphic processing method for processing a three-dimensional figure in a three-dimensional virtual space, detects an interference part where three-dimensional figures overlap each other, obtains an interference form attribute value from the detected three-dimensional figure, and determines a target part in advance. To determine if it is an interference partner
Furthermore, even if interference occurs, create a candidate area that you want to ignore, determine whether you can ignore the interference for the target part,
This is a graphic processing method for classifying interference sites by registering the determination result in an interference pair list for registering the interference state of a solid graphic and presuming it from information previously added to the solid graphic.

More preferably, the graphic processing method according to the present invention is a graphic processing method for processing a three-dimensional graphic in a three-dimensional virtual space in a graphic processing device having a storage device, a processing device, and a display device. The step of detecting the interference part where the three-dimensional figures overlap, the step of obtaining the interference form attribute value from the three-dimensional figure in the post-processing of the interference part after detecting the interference part, and the state of the attribute of the three-dimensional figure were stored Referring to the attribute matching table, determining whether the interference partner is predetermined, processing step for creating a candidate area to be ignored even if interference occurs, and determining whether the interference site can be ignored Performing a determination step and a step of registering a determination result as a flag in an interference pair list for registering the interference state of the three-dimensional figure, and added to the three-dimensional figure in advance. Is understood as a figure processing method for classifying interference sites were estimated from that information.
In a preferred example, the attribute match table and the interference pair list are stored in a storage device, and the interference pair list created as a result of processing is displayed on a display device.
Further, the present invention is grasped as a program for executing the graphic processing method on a processing device.

  According to the present invention, it is possible to reduce the work load for selecting an interference site that is truly desired.

An embodiment of the present invention will be described below with reference to the drawings.
The CAD device shown in FIG. 1 includes a processing device 1, a storage device 2, an input device 3, and a display device 4. The processing device 1 reads 101 a solid figure, detects an interference part 102 from the solid figure, performs post-processing 103 of the interference part, and displays the interference part on the display device 4 as a result. This embodiment provides an improvement of the post-processing 103.

Next, the graphic processing operation will be described with reference to the processing flowchart of FIG.
In the present embodiment, the following processing is performed by the processing device 1 executing a program for processing the following steps.
First, the presence or absence of an interference site is examined for the three-dimensional figures A and B (701). For example, by calculating the numerical expression of two solid figure expressions stored in the storage device 2, the overlapping volume of the compatible figure is obtained. If the volume is 0 or more, it can be understood that there is an interference site. . If there is an interference part as a result of the presence / absence determination (702), the attribute matching table 12 is examined to search for an attribute value to which the solid figures A and B are added in advance (704).

  Here, the attribute matching table 12 will be described with reference to FIG. The attribute matching table 12 is stored in the storage device 2, and pairs of screws that can be combined are grouped into rows and described as attribute 1 and attribute 2. For example, M3 male screw and female screw can be combined, and therefore are described in the same row as M3-1 and M3-2 as indicated by # 1. M3 is a symbol of metric thread according to JIS, and there are M4, M6, and others. -1 and -2 represent a male screw and a female screw, respectively.

  In step 704, whether the same combination as the combination of attribute values possessed by the three-dimensional figures A and B, for example, M3-1 and M3-2, obtained in step 703 exists on the attribute matching table 12 or not. Please check the rows of the attribute match table 12 in order from the top, and if there are rows labeled M3-1, M3-2 or M3-2, M3-1 in the same row, they match. To do.

  As a result of step 704, the attribute values are compared to determine whether they match (705). As a result of the attribute value match determination, if the attribute values match, it is determined that the above-described impossible interference may occur between the solid figures A and B, and the solid figures A and B are determined. An AND operation is performed on the candidate areas Z of B (706).

  Then, it is checked whether the AND operation result area obtained in step 706 and the interference site obtained in step 701 are completely included (708). According to the result of the determination (708), “ignore” flag information is written in the interference pair list 6 for this interference site (7091). If it is not completely included, it is assumed that interference that cannot be ignored is included in the interference site, and “general” flag information is written in the interference pair list 6 (7092). Note that “ignore” means that even if interference occurs, it is ignored (interference is recognized). By classifying the interference sites as described above, the flag information is sequentially written in the interference pair list 6, thereby making it possible to identify the impossible interference. When a series of processing steps is completed (710), an interference pair list 6 is created and an interference area between figures is obtained.

Next, an example of screw interference will be described with reference to FIG.
In FIG. 4, candidate areas that cause an impossible interference are defined in advance for two solid figures A and B, and cause codes that cause an impossible interference are added as attribute values to these candidate areas. And

  As shown in (1), the screw holes of the threaded part and the mating part are preliminarily provided with three-dimensional areas X and Y on the cylinder that completely include screw threads and valleys, and attribute values (such as M3-1) in this area. It is assumed that information indicating the nominal diameter of the screw has been defined.

As shown in (2), it is assumed that the screw component B and the counterpart component C are combined and that three components are also arranged in the periphery, and there are four interference sites (401 to 404).
In step 701 in FIG. 7, it is checked whether an interference site exists between the screw part B and the counterpart part C. As apparent from (2), since there is an interference site, the candidate area Z in both parts is searched, and the attribute values possessed by it, here “M3-1” and “M3-2” are extracted.

In step 704, referring to the attribute value match table 12 and comparing “M3-1” and “M3-2”, it can be seen that they match, so there is a possibility that interference between M3 screws has occurred. If there is, the process proceeds to step 706.
In step 706, an overlapping area between candidate areas is obtained by an AND operation, and in step 708, it is checked whether or not the interference site obtained in step 701 is completely included in this overlapping area. As apparent from FIG. 4 (3), since the AND operation result area and the interference part coincide with each other in the screw part B and the counterpart part C, it is assumed that the interference part is completely included. Set “screw”.

  In the case of screw part B and part A in the interference pair list 6, since no attribute value is defined on the part A side, steps 703, 706, and 7092 are performed, and the flag becomes “general”. In the case of the screw component B and the screw component D, the attribute values are “M3-1” and “M3-1”, and in step 704, they do not match and the flag is “general”. In the case of the screw part B and the part E, the attribute values are “M3-1” and “M3-2”, but the AND operation result area is not obtained in step 706, and it is determined in step 708 that it is not completely included. The flag is “general”.

  By using the flag obtained in the above procedure, it is possible to display an ignorable interference site such as “screw” in the interference pair list of FIG. When the screw and the screw hole are displaced as shown in FIG. 4D, the AND operation result area cannot completely include the interference part, and therefore the flag is “general”.

The figure which shows the structural example of the three-dimensional CAD apparatus by one Example of this invention. The figure for demonstrating the interference of the components in CAD. The figure for demonstrating the interference of the components in CAD drawing. The figure for demonstrating the interference process of the figure in one Example. The figure which shows an example of an interference pair list table table. The figure which shows an example of the attribute matching table 12. FIG. The flowchart figure with which it uses for description of the graphic processing operation | movement in one Example.

Explanation of symbols

1: processing device 2: storage device 3: input device 4: display device 6: interference pair list.

Claims (4)

In a graphic processing method for processing a solid figure in a three-dimensional virtual space,
Detecting an interference part where three-dimensional figures overlap, obtaining an interference form attribute value from the detected three-dimensional figure, determining whether the target part is a predetermined interference partner,
Furthermore, even if interference occurs, create a candidate area that you want to ignore, determine whether you can ignore the interference for the target part,
A graphic processing method characterized by registering the determination result in an interference pair list for registering the interference state of a three-dimensional figure, and classifying the interference site by estimating from information previously added to the three-dimensional figure. A graphic processing method for processing a three-dimensional graphic in a three-dimensional virtual space in a graphic processing device having a storage device, a processing device, and a display device, and processing by the processing device,
Detecting an interference site where three-dimensional figures overlap;
After detecting the interference site, in the post-processing of the interference site, obtaining an interference form attribute value from the solid figure;
Determining whether it is a predetermined interference partner with reference to the attribute matching table storing the attribute status of the three-dimensional figure;
Processing steps to create candidate areas that should be ignored even if interference occurs;
A determination step for determining whether or not to ignore the interference site;
Registering the determination result as a flag in the interference pair list for registering the interference state of the three-dimensional figure;
The graphic processing method is characterized in that the interference site is classified by estimating from information previously added to the solid graphic. 2. The graphic processing according to claim 1, wherein the attribute match table and the interference pair list are stored in the storage device, and the interference pair list created as a result of the processing is displayed on the display device. Method. A program for executing graphic processing for processing a three-dimensional graphic in a three-dimensional virtual space in a graphic processing device having a storage device, a processing device, and a display device,
Detecting an interference site where three-dimensional figures overlap;
After detecting the interference site, in the post-processing of the interference site, obtaining an interference form attribute value from the solid figure;
Determining whether it is a predetermined interference partner with reference to the attribute matching table storing the attribute status of the three-dimensional figure;
Processing steps to create candidate areas that should be ignored even if interference occurs;
A determination step for determining whether or not to ignore the interference site;
Registering the determination result as a flag in the interference pair list for registering the interference state of the three-dimensional figure;
Is executed by the processing apparatus, and is presumed from information previously added to the three-dimensional figure, and the program for graphic processing classifies the interference site.

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