JPH04314175A - Cutting method for building space - Google Patents

Abstract

PURPOSE:To generate a solid in which buildable space can be effectively utilized and to efficiently and easily generate a three-dimensional block that can be housed in the buildable space by cutting part of the three-dimensional block. CONSTITUTION:This method is comprised of block instruction step 1-1 to instruct a block to be cut, cut plane designation step 1-2 to designate a cut plane which cuts the block, cut direction instruction step 1-3 to instruct which side of the cut plane should be cut, block comprising plane cut step 1-4 to cut a block comprising plane by the cut plane, cut end plane registration step 1-5 to register a new plane on the cut end of the block after cut, and block re-definition/re-display step 1-7 to re-define and re-display the block after cut.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting method in a building space, and more particularly to a cutting method in a building space by editing blocks for three-dimensional model generation in a CAD for architectural planning and design.

0002

2. Description of the Related Art Conventionally, in a three-dimensional model generation system of CAD for architectural planning and design, it has not been possible to cut a portion of a three-dimensional block that has been created. Technical development of cutting methods is extremely difficult in terms of content, and there are still few plans and designs of buildings using cutting methods on 3D model generation systems of CAD for architectural planning and design. This is because there was little need to develop. Therefore, when creating a three-dimensional model in architectural planning and design, three-dimensional blocks are created to fit within the buildable space calculated from diagonal line restrictions and reverse shading restrictions. 3 created to fit within the buildable space
According to the diagram in Figure 8, which represents a three-dimensional block created in a buildable space using the conventional technology, if the height of the building is emphasized as shown in Figure 8(a), the dimensional block is tall but has a buildable space. Figure 8 (b)
If we focused on the size of the base area, the base area would be large, but the height would be low compared to the building space.

As a three-dimensional block that can make the most effective use of the buildable space, there is a diagram showing an example of a three-dimensional block that can make the most effective use of the buildable space shown in FIG. Figure 9(a)
There are trapezoidal pillars such as the one shown in FIG. Figures 9(a) and 9(b)
) can be created by creating a four-sided prism or a pentagonal prism and rotating them, but the operation was difficult and cumbersome. Furthermore, a solid like that shown in FIG. 9(c) could not be created either by creating a conventional column and rotating it, or by combining several solids.

[0004] Also, if the created 3D block protrudes outside the buildable space, take the step of deleting the created 3D block and creating a new 3D block that is smaller or has a lower height. It was. These steps were then repeated until the 3D block did not extend beyond the buildable space.

[0005]

[Problems to be Solved by the Invention] In such conventional three-dimensional model generation systems, there is a problem in that it is difficult to effectively utilize the buildable space using only polygonal prisms, polygonal pyramids, and rectangular parallelepipeds. Another problem is that it is difficult or impossible to generate three-dimensional blocks that can make the most effective use of buildable space. Furthermore, if the created 3D block protrudes from the buildable space, the step of re-creating the 3D block until it fits within the buildable space is repeated, which takes time and reduces work efficiency. be.

[0006] The present invention aims to solve the above-mentioned problems, makes effective use of buildable space, creates three-dimensional blocks with complex shapes for this purpose, and eliminates the trouble of re-creating three-dimensional blocks many times. The aim is to improve efficiency.

[0007]

[Means for Solving the Problems] The cutting method for a building space of the present invention includes a block instruction step for specifying a block to be cut, a cut surface specification step for specifying a cut surface on which the block is to be cut, and which side of the cut surface. A cut direction instruction step that instructs whether to cut a block, a block constituent face cut step that cuts a block constituent face with a cut face, a cut face registration step that registers a new face at the cut end of a block after cutting, and a block and a step of redefining and redisplaying the block.

[0008]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a flow diagram showing the processing steps of the cutting method for a building space according to the present invention.

A detailed explanation will be given with reference to FIGS. 1, 2, 3, 4, 5, 6, and 7.

The block instruction step 1-1 is a step for specifying a block to be cut. Indicate one side of the block to be cut, but any side of the block you specify may be used. Then, block information such as a block number internally assigned to the specified three-dimensional block in the order of creation and block attributes indicating the shape of the block, such as a rectangular parallelepiped or cylinder, is obtained. Then, the display color of the block is changed from green to red, for example.

The cutting direction instruction step 1-2 is a step of specifying a cutting surface on which the block is to be cut. The method for specifying the cut surface is 3-point instruction method 1-2-1 and 1 side 1
There is a point indicating method 1-2-2. Each designation method is shown in FIGS. 2 and 3.

[0013] In the three-point instruction method, one point 2-1 constituting the cut surface 2-2 is specified on the side of the block where the point 2-1 is located, the end point of the side of the block is specified, and the length from that end point is input. Repeat the instruction process three times. 2-1 for the designated 3 points
Expressed as As a result, information such as the coordinate values of the three points 2-1 constituting the cut surface is taken in, and based on the information on the three points 2-1, the surface equation of the cut surface is determined, and the cut surface is determined.

[0014] In the one side and one point instruction method, the cut surface 3-3
The instruction process for the side that specifies the 1 side 3-1 that makes up the 1 point 3
-4 is specified. In the edge designation process, information on both end points 3-2 of the designated edge 3-1 is taken in. Then, based on the information on the three points 3-2 and 3-4 obtained in this process, the surface equation of the cut surface is determined, and the cut surface is determined. The specified cut plane is displayed as a purple triangle, for example. The designated cut surfaces are shown in 2-2 and 3-3.

The cutting direction instruction step 1-3 is a step of instructing which side of the block divided by the cut plane is to be cut. There is a function in the program that instructs which side of the block divided by the cut plane should be cut, and it is decided there. The part of the block to be cut is displayed in light blue, for example. 4-1 shows how the part of the block to be cut is displayed and emphasized. If you wish to cut in the opposite direction, please instruct us accordingly. This allows the parts of the block to be cut and the parts not to be cut to be swapped.

Block constituent surface cutting step 1-4 is as follows:
This is a step in which each face constituting the block is cut using a designated cut plane. First, the vertex coordinates of each block's constituent faces are taken in and the relationship with the cut face is checked. If all of the block constituent faces disappear due to the cut, or if the block constituent faces do not change at all regardless of the cutting, proceed to the next step without performing this step. Next, the block configuration plane that intersects with the cut plane is cut using the cut plane. Then, the vertices and edges of the block constituent faces after cutting are registered. This series of processing is performed on all block constituent faces that intersect with the cut face. Figure 5
shows the relationship between the block configuration surface and the cut surface. 5-1 is
Block composition surface that completely disappears due to cutting, 5-
2 is a block composition surface that does not change at all regardless of the cut surface,
5-3 is a block forming surface to be cut.

The cut surface registration step 1-5 is a step of registering a new surface at the cut end of the cut block. First, sides that may constitute the cut surface 6-2 are examined. What are the possible sides that constitute the cut surface 6-2?6
As shown in -1, information on the side 6-1 that is not included is made into one side, and information on this side 6-1 is obtained and stored in a table, and one closed area is created by tracing the end points of those sides 6-1. do. This closed area is the cut surface 6-2. Then, a new surface is registered based on the information about the side 6-1 forming the closed region. 6-2 shows the cut plane to be registered.

The block redefinition and redisplay step 1-6 is a step of redefining and redisplaying the block after cutting. The redefinition process involves defining information about new vertices, edges, and faces created by cutting, and importing information about missing vertices, edges, and faces. The redisplay process involves comparing the blocks before and after the cut to obtain and delete the missing vertices, edges, and faces, and changing the display color in each process to display them in red, purple, light blue, etc. A process is performed in which the blocks after the cut are displayed in their original color, for example, green. FIG. 7 shows a block that has been cut after the redefinition and redisplay steps.

[0019]

[Effects of the Invention] As explained above, the cutting method for building spaces of the present invention makes it possible to create a three-dimensional structure that makes effective use of the buildable space by cutting a part of the three-dimensional block, and also to efficiently create a three-dimensional structure. Furthermore, it is possible to easily create a three-dimensional block that fits within a buildable space.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the processing steps of the cutting method in a building space according to the present invention.

FIG. 2 is a diagram illustrating a method of specifying a cut surface by specifying three points.

FIG. 3 is a diagram showing a method of specifying a cut plane by specifying one side and one point.

FIG. 4 is a diagram illustrating how a cut portion of a block is displayed and emphasized.

FIG. 5 is a diagram showing the relationship between a block configuration surface and a cut surface.

FIG. 6 is a diagram showing cut planes to be registered.

FIG. 7 is a diagram showing a cut block after redefinition and redisplay.

FIG. 8 is a diagram showing a three-dimensional block created in a buildable space using a conventional technique.

FIG. 9 is a diagram illustrating an example of a three-dimensional block that makes the most effective use of buildable space.

[Explanation of symbols]

1-1 Block instruction step 1-2 Cut surface specification step 1-3 Cut direction instruction step 1-4
Block composition face cutting step 1-5 Cut face registration step

Claims (2)

[Claims] [Claim 1] A block instruction step for instructing a block to be cut, and a cut surface for cutting the block to be
A cut plane specification step that specifies a point, a cut direction specification step that specifies which side of the cut plane to cut, a block constituent face cut step that cuts the block constituent face with the cut plane, and a cut face of the block after cutting. A cutting method in a building space characterized by comprising a cut plane registration step of registering a new plane, and a block redefinition/redisplay step of redefining and redisplaying the block after cutting. 2. The method for cutting in a building space according to claim 1, wherein the cutting is performed by a cut plane specifying step of specifying the cut plane by one side and one point.