CN116680768A - Method, equipment and medium for extracting CAD information to generate wall model or door window model - Google Patents

Abstract

The invention discloses a method, device and medium for extracting CAD information to generate a wall model or a door and window model, including step S1: reading the information of the input target model and the information of the built-in model, and selecting a wall diagram of the preset model layer as a copy template; step S2: obtain each line segment in the wall layer, and set a parallel line label variable to initialize and identify each processed line segment; step S3: filter the remaining unmarked line segments; step S4 : Judging whether the two line segments in the unmarked line segments are parallel, whether the distance between the line segments matches the information of the target model input in step S1, if so, then generate a wall model between the two line segments, and combine the two line segments Line segment adding identification processing, if no, then execute step S3; step S5: judge whether each line segment has been processed, if yes, then modify the generated wall model according to the information of the target model input in step S1, if not, Then step S2 is executed.

Description

Method, device and medium for extracting CAD information to generate wall model or door and window model

technical field

The invention belongs to the technical field of computer modeling data processing in the construction industry, and in particular relates to a method, equipment and medium for generating wall models or door and window models by extracting CAD information.

Background technique

In Revit software, for those architectural models with certain rules or common structures, they can be modeled through programming, thereby reducing errors caused by repeated manual operations, improving modeling efficiency, and realizing visualization of model information processing. To this end, Autodesk provides the API of Revit software, which supports developers to use the integrated development environment, use all computer languages based on the .NET framework to carry out secondary development of Revit, and create program plug-ins to extend the functions of Revit software. However, in Revit software Among them, when generating certain models with the same rules based on CAD drawings, such as walls, doors and windows of the same model, etc., the efficiency of manually generating models is low, and there is a possibility of errors caused by repeated operations.

Therefore, it is necessary to design a new method, equipment and medium for extracting CAD information to generate wall models or door and window models by using programming to automatically generate models with the same rules in batches to improve modeling efficiency and accuracy.

Contents of the invention

The object of the present invention is to provide a kind of wall body model or door and window model that utilizes programming to automatically generate the same rules in batches, to solve the problem in the prior art that some models with the same rules are generated according to CAD drawings, such as walls, doors and windows of the same model At the same time, the efficiency of manually generating a model is low, and there is a problem that repeated operations may cause errors.

The first aspect of the embodiment of the present application provides a method for extracting CAD information to generate a wall model, including: Step S1: Read the information of the input target model and the information of the built-in model, and select a wall diagram of the preset model layer as a copy template; step S2: obtain each line segment in the wall layer, and set a parallel line label variable to initialize and identify each processed line segment; step S3: filter the remaining unmarked line segments; step S4 : Judging whether the two line segments in the unmarked line segments are parallel, whether the distance between the line segments matches the information of the target model input in step S1, if so, then generate a wall model between the two line segments, and combine the two line segments Line segment adding identification processing, if not, then execute step S3; step S5: judge whether each line segment has been processed, if yes, then modify the generated wall model according to the information of the target model input in step S1, if not, Then step S2 is executed.

Further, the information of the target model in step S1 includes the thickness of the wall model and the offset information of the bottom and top, and the information of the built-in model includes the constraints of the bottom and top of the wall model.

Further, before selecting a wall layer of the preset model as the copy template in step S1, it includes judging whether the family type of the wall model to be generated exists, if not, copying a new wall family type and modifying the wall thickness.

Further, in step S4, it is judged whether the two line segments in the unmarked line segments are parallel, and whether the distance between the line segments matches the information of the target model input in step S1. Specifically, first determine whether the two line segments are parallel, and then calculate the two line segments Then judge whether the positions of the two line segments are staggered. If the conditions of parallelism and non-staggering are met, and the distance value is consistent with the information input into the target model, then the label of the line segment is substituted into the correct line segment label variable.

Further, to generate a wall model between two line segments, if the variable value of the parallel line label changes, the match is successful, obtain the two matched line segments, copy one of the line segments, and take it to point to the other line segment on the plane The unit normal vector of , and then move the copied line segment along the direction of the normal vector for half the distance of the thickness, so as to obtain the middle line of the two line segments, and generate the wall model with the middle line and the wall family type.

The second aspect of the embodiment of the present application provides a method for extracting CAD information to generate a door and window model, matching the wall model generated by the above-mentioned method for extracting CAD information to generate a wall model, including: Step S10: Read the built-in door and window Family and all door and window family types, select a built-in wall type as a copy template, obtain the wall layer, each line segment and curve of the door and window layer, and the text information of the door and window information layer, and read and input the bottom of the wall where the door and window are located Top constraint, bottom top offset, height from the ground and family of each door and window model, select the first family type of the door and window family as the copy template; step S20: obtain the line segment of each door and window layer; step S30: determine Whether it intersects with the line segment of the wall layer at the same time, if not, execute step S20, if so, generate a wall at the line segment formed by the midpoints of the two line segments; step S40, judge the wall generated in step S30 Whether the model of the door or window carried by the body has a corresponding door family type or window family type, if so, then generate a corresponding door instance or a corresponding window instance at the wall, if not, according to the input door family type Or window family and obtained door information or window information copy a new door family type or window family type, and add attributes; step S50, judge whether the line segments of each door and window layer have been processed, if not, then perform step S20 .

A third aspect of the embodiments of the present application provides a computer device, including a memory, a processor, and a computer program stored in the memory and operable on the computer device. When the processor executes the computer program, extracting Steps in a method for generating a wall model or a door and window model from CAD information.

The fourth aspect of the embodiments of the present application provides a computer-readable storage medium, the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the extraction provided by the first solution or the second solution is realized. Each step of the method for generating a wall model or a door and window model from the CAD information.

Implementing a method, device and medium for extracting CAD information to generate a wall model or a door and window model provided by the embodiment of the present application has the following beneficial effects:

The embodiment of the present application uses programming to automatically generate wall models or door and window models with the same rules in batches to improve modeling efficiency and accuracy.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the descriptions of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only of the present invention. For some embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without paying creative efforts.

Fig. 1 is the implementation flow diagram of a kind of extraction CAD information generation wall body model method that the embodiment of the present invention provides;

Fig. 2 is the implementation flowchart of a kind of method that extracts CAD information and generates door and window model provided by the embodiment of the present invention;

FIG. 3 is a structural block diagram of a computer device provided by an embodiment of the present invention.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Referring to FIG. 1 , FIG. 1 shows an implementation flow chart of a method for extracting CAD information to generate a wall model provided by an embodiment of the present application. A method for extracting CAD information to generate a wall model, comprising: step S1: read the information of the input target model and the information of the built-in model, and select a wall layer of the preset model as a copy template; step S2: obtain the For each line segment in the wall layer, set a parallel line label variable to initialize and identify each processed line segment; step S3: filter the remaining unmarked line segments; step S4: judge two line segments among the unmarked line segments Whether it is parallel, whether the distance between the line segments matches the information of the target model input in step S1, if so, generate a wall model between the two line segments, and add identification to the two line segments, if not, perform the step S3; Step S5: Determine whether each line segment has been processed, if yes, modify the generated wall model according to the information of the target model input in step S1, if not, execute step S2.

In detail, before selecting a wall layer of the preset model as the copy template in step S1, it is necessary to judge whether the family type of the wall model to be generated exists, if not, copy a new wall family type and modify the wall Thickness; in step S4, it is judged whether the two line segments in the unmarked line segment are parallel, and whether the distance between the line segments matches the information of the target model input in step S1. Then judge whether the positions of the two line segments are staggered. If the conditions of parallelism and non-staggering are met, and the distance value matches the information of the input target model, then the label of the line segment is substituted into the correct line segment label variable; Specifically, if the variable value of the parallel line label changes, then the matching is successful, obtain the two matched line segments, copy one of the line segments, and take its unit normal vector pointing to the other line segment on the plane, and then use The copied line segment is moved half the distance along the normal vector direction to obtain the middle line of the two line segments, and the wall model is generated with the middle line and the wall family type.

In addition, in this embodiment, the popular description of the method for extracting CAD information to generate a wall model is as follows:

Firstly, all the built-in elevations are obtained and passed to the front-end pop-up window for the user to select the bottom and top constraints of the wall model, and at the same time, the thickness and bottom and top offset information of the wall model to be generated can be input in the pop-up window. Then import the wall layer in the CAD drawing to the system, the system will get all the line segments of the wall layer from the imported CAD drawing, and then judge whether the family type of the wall model to be generated exists, if not, copy a new one The type of the wall family and modify the thickness of the wall; then read all the line segments (line segment A) of the wall layer in a loop, set a parallel line label variable initialization, and unprocessed line segments (line segment A) in this loop B) Perform cyclic reading, first determine whether the two line segments are parallel, then calculate the distance between the two line segments, and then determine whether the positions between the two line segments are interlaced, if the conditions of parallel and non-interlacing are met, and the distance value is equal to The thickness value input by the user, then substitute the label of the line segment into the variable of the correct line segment label. After the sub-loop ends, if the variable value of the parallel line label changes, the match is successful. Get the two matched line segments, copy one of the line segments, and take its unit normal vector pointing to the other line segment on the plane, and then make the copied line segment Move half the distance of the thickness along the direction of the normal vector to get the middle line of the two line segments, generate the wall model based on the middle line and the wall family type, and finally modify the wall model according to the initial user input information. In this way, the purpose of automatically generating wall models with the same rules in batches is realized. In other embodiments, in the wall generation module, the middle line based on which the wall model is generated can be manually drawn and added when drawing the CAD drawing, and then assigned a specific layer for later identification, which is not limited here.

In detail, the mathematical model used in this embodiment is:

① Determine whether two line segments are parallel: take the unit vectors of the two line segments, if the unit vector of one line segment is equal to the unit vector of the other line segment or its inverse, then the two line segments are parallel.

②Calculate the distance between a set of parallel lines: use the distance from a point in one line (take the midpoint) to the other side, that is, the area method. Take the midpoint of line segment A and the two endpoints of line segment B, and connect them to form two new line segments C, D; the three line segments B, C, and D are connected end to end to form a line with B as the base and the length of the high line equal to the distance between the AB line segments For a triangle, use the triangle area formula S=sqrt[p(p-a)(p-b)(p-c)], where a, b, and c are the lengths of the three sides of the triangle, p is the perimeter of the triangle, and sqrt is the square root. After calculating the area, Then use height = area * 2 / base to get the distance you want.

③Judging whether the positions of a group of parallel lines are staggered: You can take the midpoint of the shorter line segment in a group of parallel lines (if the lengths are equal, choose one of the line segments arbitrarily), and calculate the distance from the midpoint to the other side (if the positions are staggered, Then the distance is equal to the distance between the midpoint and an endpoint of another line segment), and then calculate the distance between the two parallel lines, if the two distances are not equal, it means that the two parallel lines are interlaced.

④ Take the normal vector of a line segment pointing to a parallel line on the specified plane: first obtain the unit normal vector (X, Y, Z) of the line segment, because the Z coordinate of the line segment generated by CAD import is 0, so according to the normal vector The calculation formula can get one of its two normal vectors (Y, -X, Z) in the plane, and then take an end point of the line segment and the midpoint of its parallel line to generate a vector whose end point points to the midpoint, and calculate The dot product of two vectors, if the result is greater than zero, then the normal vector obtained above is the normal vector obtained, otherwise take its inverse.

Referring to FIG. 2 , FIG. 2 shows an implementation flow chart of a method for extracting CAD information to generate a door and window model provided by an embodiment of the present application. A method for extracting CAD information to generate a door and window model, comprising: Step S10: Read built-in door and window families and all door and window family types, select a built-in wall type as a copy template, obtain a wall layer, and each line segment of the door and window layer And the curve and the text information of the door and window information layer, read and input the bottom and top constraints of the wall where the doors and windows are located, the bottom and top offset, the height from the ground and the family of each door and window model, and select the first family type of the door and window family As a copy template; step S20: obtain the line segment of each door and window layer; step S30: judge whether it intersects with the line segment of the wall layer at the same time, if not, perform step S20, if so, in the middle of the two line segments A wall is generated at the line segment formed by the points; step S40, whether there is a corresponding door family type or window family type for the model of the door or window carried by the wall body generated in the judgment step S30, if so, corresponding at the wall Generate a corresponding door instance or a corresponding window instance, if not, copy a new door family type or window family type according to the input door family or window family and the obtained door information or window information, and add attributes; step S50, It is judged whether the line segments of each door and window layer have been processed, and if not, step S20 is executed.

In addition, in this embodiment, the popular description of the method of extracting CAD information to generate door and window models is as follows:

Firstly, the user is prompted to click the imported CAD drawing to obtain the wall layer, the line segment curve of the door and window layer, and the text of the door and window information layer, and then obtain all the built-in elevations, door and window families and transfer them to the front-end pop-up window for the user to set the wall At the same time, the user can enter the bottom and top offsets of the wall and the height above the ground corresponding to each type of door and window in the pop-up window, and then obtain the wall family type and each door and window family The first family type acts as a template for cloning. Circularly read the line segment in the door and window layer. If the line segment intersects with two line segments in the wall layer at the same time, then the line segment A is the approximate position where the door and window are generated, and then take the two walls that intersect with line segment A The length of the line segment of the layer is used as the thickness of the wall to copy the new wall family type, take two midpoints to connect line segment B, use line segment B and the wall family type to generate the wall model where the doors and windows are located, and then modify the wall according to the information entered by the user body model. According to the shape characteristics of doors and windows in the CAD drawing, if line segment A intersects any curve in the door and window layer, the position of line segment A is the door model, otherwise it is the window model. Determine the type of door and window, and then obtain the text of the door and window information layer through a loop, calculate the distance between the text position and line segment A, and obtain the text closest to line segment A, that is, the model of the door or window here. Determine whether there is a door or window family type corresponding to the model in Revit, if not, copy a new family type and set the width and height dimensions of the door and window according to the model text, and place the door and window model on the corresponding wall with the door and window family type.

Fig. 3 is a structural block diagram of a computer device provided by an embodiment of the present application. The computer device 40 of this embodiment includes: a processor 41, a memory 42, and a computer program 43 stored in the memory 42 and operable on the processor 41, such as extracting CAD information to generate a wall model or a door and window model method of procedure. When the processor 41 executes the computer program 43, the steps in the above embodiments of the method for extracting CAD information to generate a wall model or a door and window model are realized.

Exemplarily, the computer program 43 can be divided into one or more modules, and the one or more modules are stored in the memory 42 and executed by the processor 41 to complete the present application. The one or more modules may be a series of computer program instruction segments capable of accomplishing specific functions, and the instruction segments are used to describe the execution process of the computer program 43 in the computer device 40 .

The turntable device may include, but not limited to, a processor 41 and a memory 42 . Those skilled in the art can understand that FIG. 3 is only an example of the computer device 40, and does not constitute a limitation to the computer device 40. It may include more or less components than those shown in the illustration, or combine certain components, or different components. , for example, the turntable device may also include an input and output device, a network access device, a bus, and the like.

The so-called processor 41 may be a central processing unit (Central Processing Unit, CPU), and may also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), Off-the-shelf programmable gate array (Field-12 Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like.

The memory 42 may be an internal storage unit of the computer device 40 , such as a hard disk or memory of the computer device 40 . The memory 42 can also be an external storage device of the computer device 40, such as a plug-in hard disk equipped on the computer device 40, a smart memory card (Smart Media Card, SMC), a secure digital (SecureDigital, SD) card , Flash Card (Flash Card), etc. Further, the memory 42 may also include both an internal storage unit of the computer device 40 and an external storage device. The memory 42 is used to store the computer program and other programs and data required by the turntable device. The memory 42 can also be used to temporarily store data that has been output or will be output.

In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method for extracting CAD information to generate a wall model or a door and window model in the above embodiment is implemented.

Those of ordinary skill in the art can understand that all or part of the flow in the method for extracting CAD information to generate a wall model or a door and window model in the above embodiment can be completed by instructing related hardware through a computer program, and the computer program can be stored In a computer-readable storage medium, the computer program may include the processes of the above-mentioned method embodiments when executed. Wherein, any reference to memory, storage, database or other computer-readable storage medium used in the various embodiments provided in the present application may include non-volatile and/or volatile memory. Nonvolatile memory can include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Chain Synchlink DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (8)

1. A method for extracting CAD information to generate a wall model, characterized in that, comprising: Step S1: Read the information of the input target model and the information of the built-in model, and select a wall layer of the preset model as a copy template; Step S2: Obtain each line segment in the wall layer, and set a parallel line label variable to initialize and identify each processed line segment; Step S3: Screening the remaining unidentified line segments; Step S4: Determine whether the two line segments in the unidentified line segments are parallel, and whether the distance between the line segments matches the information of the target model input in step S1, if so, generate a wall model between the two line segments, and Two line segments add identification processing, if not, then execute step S3; Step S5: Determine whether each line segment has been processed, if yes, modify the generated wall model according to the information of the target model input in step S1, if not, execute step S2. 2. The method for extracting CAD information according to claim 1 to generate a wall model is characterized in that the information of the target model in step S1 includes the thickness of the wall model and the offset information of the bottom and top, and the information of the built-in model includes wall Bottom and top constraints of the body model. 3. The method for extracting CAD information according to claim 1 to generate a wall model is characterized in that, before selecting a wall layer of a preset model as a copy template in step S1, it is characterized in that it is judged whether the family type of the wall model to be generated is Exists, if not, copy a new wall family type and modify the wall thickness. 4. extract the method for CAD information generation wall body model according to claim 1, it is characterized in that, in the step S4, judge whether two line segments in the line segment that is not identified are parallel, whether the distance between the line segments coincides with the input in the step S1 The information of the target model is to first judge whether the two line segments are parallel, then calculate the distance between the two line segments, and then judge whether the positions of the two line segments are staggered. If the conditions of parallel and non-staggered are met, and the distance value matches the input The information of the target model, then substitute the label of the line segment into the variable of the correct line segment label. 5. The method for extracting CAD information according to claim 4 to generate a wall model is characterized in that generating the wall model between two line segments is specifically if the parallel line label variable value changes, then successfully matches, and obtains the matched Two line segments, copy one of the line segments, and take the unit normal vector pointing to the other line segment in the plane, and then move the copied line segment along the direction of the normal vector for half the thickness, so as to obtain the middle line of the two line segments, as This midline and wall family type generates a wall model. 6. A method for extracting CAD information to generate a door and window model, matching the wall model generated by the method for extracting CAD information to generate a wall model according to any one of claims 1 to 5, characterized in that, comprising: Step S10: Read the built-in door and window family and all door and window family types, select a built-in wall type as a copy template, obtain the wall layer, each line segment and curve of the door and window layer, and the text information of the door and window information layer, read Take the bottom and top constraints, bottom and top offsets of the wall where the doors and windows are located, the height from the ground and the family of each door and window model, and select the first family type of the door and window family as the copy template; Step S20: Obtain the line segment of each door and window layer; Step S30: judging whether it intersects with the line segment of the wall layer at the same time, if not, execute step S20, if yes, generate a wall at the line segment formed by the midpoints of the two line segments; Step S40, judging whether the model of the door or window carried by the wall generated in step S30 has a corresponding door family type or window family type, and if so, correspondingly generate a corresponding door instance or a corresponding window instance at the wall , if not, copy a new door family type or window family type according to the input door family or window family and the obtained door information or window information, and add attributes; Step S50, judging whether the line segments of each door and window layer have been processed, if not, go to step S20. 7. A computer device, comprising a memory, a processor, and a computer program stored in the memory and operable on the processor, characterized in that, when the processor executes the computer program, the computer program according to claim The step of any one of 1 to 6. 8. A computer-readable storage medium, the computer-readable storage medium storing a computer program, characterized in that, when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are realized .