JPH0696162A - Restoring method for block in cad - Google Patents

Abstract

PURPOSE:To easily restore a state to the one before change only by designating a plane desired to restore and to improve workability by designating the plane that becomes the target of restoration of a block desired to restore, deciding whether or not the restoration of a designated plane can be feasible, displaying a temporary shape of the block after restoration when it is feasible, and executing restoration processing. CONSTITUTION:Firstly, the plane that becomes the target of the restoration of the block desired to restore is designated in step S1. Concretely, the plane is designated by instructing two comprising lines of the plane. At this time, it is checked whether or not the plane is composed of instructed two lines. Then, it is decided whether or not the restoration of the designated plane can be feasible in step S2. Then, the constituent of the block after restoration is decided, and the temporary shape after restoration is displayed in step S3. Following that, the restoration processing is executed in step S4. It is executed based on a result in which the feasibility/infeasibility of the restoration processing in step S2 is decided and a display result for the temporary shape after restoration in step S3 on the content of the restoration processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a block restoration method in CAD, and in particular CA used for partially changing the shape when editing a three-dimensional model of CAD for architectural planning and design.
A method for restoring blocks in D.

[0002]

2. Description of the Related Art The conventional method of restoring a block in CAD is to create a new block at the location of the block to be restored. For example, in the field of architectural CAD, there is a block cutting system as a method of partially changing the shape of a block, and this block cutting system includes steps (hereinafter referred to as S) as shown in the flowchart of FIG. The block to be cut is designated in 51, then the infinite plane to be cut is designated by 3 points or 1 point and 1 line in S52, the portion to be cut is highlighted in S53, and the cutting is actually executed in S54. Since the method was adopted, the part which was once cut could not be restored, but it was restored as a block and the cutting was performed again.

[0003]

SUMMARY OF THE INVENTION Conventional CAD described above
In the block restoration method in, since the part where cutting is once executed cannot be restored to the block, it has to be restored as a block and cutting is performed again, which requires a lot of man-hours and is troublesome. There is a point.

An object of the present invention is to provide a block restoring method in CAD in which workability is improved by simply designating a surface to be restored and restoring the state before the change.

[0005]

A block restoration method in CAD according to the present invention is a block restoration method in CAD which has a function of restoring a block whose shape has been changed to a shape before the change. A restoration plane designating process for designating a target face, a restoration process feasibility determining process for determining whether restoration of the designated face is feasible, and a post-restoration process for temporarily displaying the shape of the block after restoration. This is realized by a shape display process and a restoration process execution process of performing a restoration process based on the results of the restoration process feasibility determination process and the restored shape display process.

In the block restoration method for CAD according to the present invention, in the restoration process execution process, a temporary display erasing process for erasing all the temporarily displayed block shape displays after restoration in the shape display process after restoration, and a restoration target Block deletion processing that deletes other parts of the block that are the surfaces, lines, and points that make up this block, deletion processing of the specified surface that deletes the surface specified as the target of restoration processing, and whether restoration processing is possible A new line registration process for registering and displaying the intersection points and intersection lines obtained in the judgment process, and changing and displaying the end point information registered for all the lines that change the shape obtained in the shape display process after restoration. The configuration line registration process of changing the component line and the component line setting process of the face in which the registration is changed by resetting the component line segment of the face adjacent to the face specified as the restoration target. Even There.

[0007]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a flow chart of one embodiment of the present invention.

In the block restoring method for CAD according to the present invention, in step (hereinafter referred to as "S"), the surface to be restored of the block to be restored is designated, and whether the restoration of the surface designated in S2 is feasible or not. If possible, the shape of the corresponding block after restoration is temporarily displayed in S3, and restoration processing is executed in S4.

FIG. 2 is a flow chart showing the detailed contents of the execution of the restoration processing displayed in FIG.

In S11, a temporary ideographic erasing process is performed, in S12, a block deleting process is performed, in S13, a specified face is deleted, a new line registration process is performed in S14, and a component line registration changing process is performed in S15. In S16, the component line setting process of the surface is performed, and in S17, the restored block is registered.

FIG. 3 is an explanatory diagram for explaining a state when it is determined that the restoration of the designated surface cannot be executed.

FIG. 4 is a flow chart of the process of the step of judging whether or not the restoration process shown in FIG. 1 is possible.

FIG. 5 is an explanatory view for explaining the processing state of the step for executing the restoration processing displayed in FIG.

FIG. 6 is an explanatory view for explaining a state in which the shapes of the corresponding blocks before and after restoration are provisionally displayed.

Next, the operation will be described. 1 and 2 are mainly used in the description, and FIGS. 3 to 6 are referred to when necessary.

First, in S1, the surface to be restored of the block to be restored is designated. Specifically, set the surface composition line to 2
The surface is specified by this instruction. At this time, it is checked whether or not the plane is composed of the designated two lines.

Next, it is determined whether or not the restoration of the surface designated in S2 can be executed. Detailed operations of the determination method will be described with reference to FIGS. 3 and 4. First, it is checked whether another block is connected to the specified surface. If another block is connected to the specified surface, the surface specified in S4 cannot be deleted, so it is determined that the restoration processing cannot be performed. FIG. 3A shows an example that cannot be restored because another block 34 is connected to the designated surface 31.

Next, a surface adjacent to the designated surface is searched for, and the intersection line of these surfaces is obtained. In this case, when the number of faces adjacent to the designated face is 1, it is determined that the restoration process cannot be performed. FIG. 3B is an example in which restoration is not possible because the number of surfaces adjacent to the designated surface 32 is one.

The method of obtaining the intersection line of two surfaces is to judge whether or not the two surfaces are parallel by the cross product of the normal vectors of the surfaces. If they are not parallel, the direction vector of the intersection line and the coordinate value of the endpoints of the intersection line. Ask for. When the intersection lines of all the adjacent faces have been obtained, whether or not the restoration process is possible is determined based on the obtained intersection lines. When the designated surface 41 is designated as the restoration target, the intersection lines 46, 47, 48, 49, 50 of the adjacent surfaces 42, 43, 44, 45 of the designated surface 41 are obtained in FIG. It is a figure.

With respect to the obtained intersection lines, it is judged by the cross product of the vectors whether or not the direction vectors of the respective intersection lines intersect each other. If the direction vectors of the intersection line intersect each other, obtain the coordinates of the intersection point. If the intersection obtained at this time is the vertex of the block to be restored, it is not regarded as an intersection. When the number of intersections obtained for all intersections is one or two, it is determined that the restoration processing can be performed on the specified surface. When there is only one intersection, that point becomes the vertex of the restored block. When there are two intersections, the line connecting the two intersections becomes the constituent line of the restored block. Figure 3 (c)
Indicates a case where there are three or more intersections of the lines of intersection with respect to the designated surface 33 and restoration cannot be performed. FIG. 4B is a diagram in which the respective intersection points 51 and 52 are obtained with respect to the intersection lines 46 to 50 obtained in FIG. 4A. In this case, since there are two intersections of the intersection lines, restoration processing can be performed. In FIG. 4 (c), adjacent surfaces 54, 55, and
Since 56 exists and the intersection 60 of the intersection lines 57, 58, 59 of the adjacent surfaces is only one point, the restoration process can be performed.

If it is determined that the restoration process can be performed, either the intersection line or the intersection point exists and the intersection point coordinate value is held. In FIG. 4B, the intersection line and coordinate values of two points are held as data, and in FIG. 4B, the intersection point and coordinate values thereof are held as data.

Next, in S3, the constituent elements of the restored block are determined and the restored temporary shape is displayed. As a method,
For all the constituent lines of the block to be restored,
It is determined whether the intersections or the end points of the intersections are on the straight lines of the respective constituent lines. If there is an intersection on the straight line, the start point or the end point of the two end points of this line is closer to the intersection, and the direction of changing the line is determined. At this time, a part whose shape changes and a part to be newly generated are obtained and provisionally displayed.

Subsequently, the restoration process is executed in S4. The contents of the restoration process are based on the result of judgment of the restoration process in S2 and the display result of the temporary shape after the restoration in S3. Run.

Next, a series of operations of the restoration process will be described in detail with reference to FIGS.

First, in step S11, temporary display erasing processing is performed to erase all display of the block shape displaying the restored temporary shape. Next, block deletion processing is performed in S12, and the block to be restored is deleted. At this time, the information on the constituent surface of the block and the block type are held (that is, even if the block is deleted, the surfaces, lines, and points that constitute the block are not deleted). Subsequently, in S13, the designated surface is deleted, and the surface designated as the target of the restoration processing is deleted. At this time, if there is a pattern on the specified surface, the pattern is also deleted. In addition, the constituent lines of the specified surface are retained as deleted data (even if the surface is deleted, the lines and points forming the surface are not deleted). Next, in S14, a new line registration process is performed, and the intersection or line obtained when the restoration process is first determined is registered and displayed. Here, the leading end of each line segment, that is, the portion that becomes the apex or the intersection is hereinafter collectively referred to as an end point. Next, in step S15, the registration change processing of the constituent lines is performed, and the registered end point information is changed and the display is changed for all the lines to be changed in order to obtain the shape of the corresponding block after the restoration that is obtained earlier. To do. FIG. 5 (a) shows change lines 71, 72, 73,
It is the figure which changed the end point to 74 respectively. Change line 71 has endpoints from vertex 63 and vertex 64 to vertex 63 and intersection 61, change line 72 has endpoints from vertex 65 and 66 to vertex 65 and intersection 62, and change line 73 has endpoints from vertex 67 and vertex 68. Vertex 67 and intersection 62
In addition, the end point of the change line 74 is changed from the vertex 69 and the vertex 70 to the vertex 69 and the intersection point 61, respectively. Subsequently, in S16, the constituent line setting process of the surface is performed, and the constituent line segment of the surface is set again for the surface adjacent to the surface designated as the restoration target and the registration is changed. At this time, the constituent line segment of the new surface is determined by how the constituent line segment of the surface so far is changed. Next, the setting of the constituent components of this surface will be described in detail.

First, the constituent lines constituting the surface are picked up one by one, and if the first line segment has been changed by the constituent line registration change processing in S15, the changed constituent line is changed to the constituent line of the new surface. And If the designated surface has been deleted in S13, the line segment registered in the new line registration processing in S14 is used as the first constituent line of the new surface, and the next constituent line is S1.
Among the lines changed in the registration change process of the component line 5 in S5, S14
The line segment that can be connected to the line registered in the new line registration process of is searched for. At this time, it is assumed that this constituent line has not been changed or deleted, and the subsequent processing is performed. Also, if the first line segment of the surface constituent line has not been changed or deleted,
As it is, it becomes a new surface composition line.

The processing of the second and subsequent constituent lines differs depending on the setting method of the preceding line segment. When the previous line segment has not been changed or deleted, the setting method of the first constituent line is the same. If the end point information of the preceding line segment has been changed in the constituent line registration change processing of S15, the next constituent line is also searched from among the line segments changed in the constituent line registration change processing of S15. If the next constituent line is not in the line segment changed in the constituent line registration change processing of S15, it is determined whether the line registered in the new line registration processing of S14 can be connected. If the new line cannot be connected, it will be used as it is for the new surface. Repeat this to set a new surface component line.

5 (b) to 5 (d) are explanatory views for explaining a state in which the constituent lines of the surface are reset.

First, in FIG. 5 (b), the constituent line 75, which is one of the constituent lines forming the original surface, is not changed or deleted and is displayed as the new surface constituent line 75. The case is shown. The new surface is line 75, line 7
6, a change line 77, and a change line 78. Next, FIG. 5 (c) shows a case where one of the constituent lines forming the original surface is deleted as a deletion line 79. The new surface is composed of a new line 80, a change line 81, a constituent line 82, and a change line 83. Finally, FIG. 5 (d) shows a case where one of the constituent lines forming the original surface is changed as a change line 84. New surface is change line 84, composition line 85, change line 8
6, a new line 87. The deletion line 88 does not affect the processing here.

Returning to FIG. 2, the block registration processing after restoration is performed in S17, and the surface already re-registered in the constituent line setting processing of S16 and the surface not adjacent to the surface designated as the restoration target. And are registered as a new block. At this time, the block type takes over the block type held before the restoration. In addition, the face specified as the restoration target and its constituent lines and points are deleted here.

FIG. 6 (a) is before restoration, and FIG. 6 (b) is before restoration.
FIG. 6 is an explanatory diagram illustrating a state in which the shape of a corresponding block after restoration is tentatively displayed. A block 92 shown in FIG. 6B shows a display state when a surface indicated by hatching is designated for the cut block 91 shown in FIG. 6A and a restoration process is executed. ing.

[0033]

As described above, according to the present invention, the restoration surface designating process for designating the surface to be restored of the block to be restored and the restoration processing for judging whether the designated surface can be restored or not. A propriety determination process, a restored shape display process for temporarily displaying the shape of the block after restoration, and a restoration process execution process for performing restoration processing based on the results of the restoration process feasibility determination process and the restored shape display process. By providing the above, it is possible to easily restore the state before the change only by designating the surface to be restored, and the workability is improved.

[Brief description of drawings]

FIG. 1 is a flow chart of one embodiment of the present invention.

FIG. 2 is a flowchart showing detailed contents of execution of restoration processing displayed in FIG.

FIG. 3 is an explanatory diagram illustrating a state when it is determined that restoration of a designated surface cannot be performed.

FIG. 4 is a process flow chart of a step of determining whether or not the restoration process shown in FIG. 1 is possible.

FIG. 5 is an explanatory diagram illustrating a processing state of a step of executing the restoration processing displayed in FIG. 1.

FIG. 6 is an explanatory diagram illustrating a state in which the shapes of corresponding blocks before and after restoration are temporarily displayed.

FIG. 7 is a flowchart of a block restoration method in conventional CAD.

[Explanation of symbols]

31, 32, 33, 41, 53 Designated surface 34, 91, 92 Block 42, 43, 44, 45, 54, 55, 56 Adjacent surface 46, 47, 48, 49, 50, 57, 58, 59
Intersection lines 51, 52, 60, 61, 62 Intersection points 63, 64, 65, 66, 67, 68, 69, 70
Vertices 71, 72, 73, 74, 77, 78, 81, 83, 8
4,86 Change line 75,76,82,85 Component line 79,88 Delete line 80,87 New line

Claims (2)

[Claims] 1. In a block restoration method in CAD having a function of restoring a block whose shape has been changed to the shape before the change, a restoration surface designation step of designating a surface to be restored of a block to be restored, and the designation. A restoration process feasibility determination process that determines whether restoration of the surface to be performed is feasible,
It comprises a shape display process after restoration for temporarily displaying the shape of the corresponding block after restoration, and a restoration process execution process for performing restoration processing based on the results of the restoration process feasibility determination process and the shape display process after restoration. A block restoration method in CAD characterized by the following. 2. The restoration process execution process erases all temporarily displayed block shape displays after restoration in the post-restoration shape display process, and configures this block for the block to be restored. Block deletion processing that deletes other parts while leaving faces, lines, and points to be deleted, specified surface deletion processing that deletes the surface specified as the target of restoration processing, and intersections and intersection lines found in the restoration processing feasibility judgment process A new line registration process of registering and displaying a line, and a registration change process of a component line that changes the display by changing the registered end point information for all lines that change the shape obtained in the shape display process after restoration. When,
The CAD according to claim 1, further comprising: a constituent line setting process of resetting a constituent line segment of the surface adjacent to the surface designated as the restoration target to change registration. How to restore blocks.