CN116680768A - Method, equipment and medium for extracting CAD information to generate wall model or door window model - Google Patents
Method, equipment and medium for extracting CAD information to generate wall model or door window model Download PDFInfo
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Abstract
The application discloses a method, equipment and medium for extracting CAD information to generate a wall model or a door window model, which comprises the following steps of S1: reading the input information of the target model and the information of the built-in model, and selecting one wall layer of the preset model as a copying template; step S2: acquiring each line segment in the wall body image layer, and setting a parallel line label variable to initialize and mark each processed line segment; step S3: screening the remaining unidentified line segments; step S4: judging whether two line segments in the unidentified line segments are parallel or not, if so, generating a wall model between the two line segments, and adding identification processing to the two line segments, if not, executing a step S3; step S5: and judging whether each line segment is processed, if so, modifying the generated wall model according to the information of the target model input in the step S1, and if not, executing the step S2.
Description
Technical Field
The application belongs to the technical field of computer modeling data processing in the building industry, and particularly relates to a method, equipment and medium for extracting CAD information to generate a wall model or a door and window model.
Background
In the revit software, building models with certain rules or general purposes for the structures can be modeled through programming, so that errors caused by repeated manual operation are reduced, modeling efficiency is improved, and visualization of model information processing is realized. For this purpose, autodesk provides APIs for Revit software, supports developers to secondarily develop Revit by using all computer languages based on NET frames, and creates program plug-ins to expand functions of the Revit software, however, in the Revit software, models with the same rules are generated according to CAD drawings, such as walls, doors and windows with the same model, etc., manual model generation is low in efficiency, and the possibility of errors caused by repeated operation exists.
Therefore, a new method, equipment and medium for extracting CAD information to generate a wall model or a window model are needed to be designed, wherein the model with the same rule can be automatically generated by programming in batches, and the modeling efficiency and accuracy are improved.
Disclosure of Invention
The application aims to provide a method for automatically generating wall models or door and window models with the same rules in batches by utilizing programming, so as to solve the problems that in the prior art, models with the same rules, such as walls, doors and windows with the same model and the like, are generated according to CAD drawings, the efficiency of manually generating the models is low, and the possibility of errors caused by repeated operation exists.
A first aspect of an embodiment of the present application provides a method for extracting CAD information to generate a wall model, including: step S1: reading the input information of the target model and the information of the built-in model, and selecting one wall layer of the preset model as a copying template; step S2: acquiring each line segment in the wall body image layer, and setting a parallel line label variable to initialize and mark each processed line segment; step S3: screening the remaining unidentified line segments; step S4: judging whether two line segments in the unidentified line segments are parallel or not, if so, generating a wall model between the two line segments, and adding identification processing to the two line segments, if not, executing a step S3; step S5: and judging whether each line segment is processed, if so, modifying the generated wall model according to the information of the target model input in the step S1, and if not, executing the step S2.
Further, in step S1, the information of the target model includes thickness of the wall model and offset information of the bottom and top of the wall model, and the information of the built-in model includes constraints of the bottom and top of the wall model.
Further, step S1 includes determining whether a family type of the wall model to be generated exists before selecting a wall layer of the preset model as the replication template, and if not, replicating a new family type of the wall and modifying the wall thickness.
Further, in step S4, it is determined whether two line segments of the unidentified line segments are parallel, whether the distance between the line segments matches the information of the target model input in step S1 is specifically that whether the two line segments are parallel is determined first, then the distance between the two line segments is calculated, then whether the positions between the two line segments are staggered is determined, if the condition of parallelism and non-staggering is satisfied, and if the distance value matches the information of the input target model, the label of the line segment is substituted into the label variable of the correct line segment.
Further, the wall model is generated between two line segments, specifically, if the variable value of the parallel line label changes, the two line segments are successfully matched, two matched line segments are obtained, one line segment is copied, a unit normal vector pointing to the other line segment on the plane is taken, then the copied line segment moves by half of the thickness along the normal vector direction, so that an intermediate line of the two line segments is obtained, and the wall model is generated by the intermediate line and the wall model.
A second aspect of the embodiment of the present application provides a method for generating a door and window model by extracting CAD information, which is matched with a wall model generated by the method for generating a wall model by extracting CAD information, including: step S10: reading built-in door and window families and all door and window family types, selecting a built-in wall type as a copying template, acquiring a wall layer, each line segment and curve of the door and window layer and text information of the door and window information layer, reading bottom top constraint and bottom top offset of a wall where an input door and window is located, and selecting a first family type of the door and window family as the copying template; step S20: acquiring line segments of each door and window layer; step S30: judging whether the wall body is intersected with the line segments of the wall body layer at the same time, if not, executing the step S20, and if so, generating a wall body at the line segment formed by connecting the midpoints of the two line segments; step S40, judging whether the model of the door or window carried by the wall body generated in the step S30 has a corresponding door family type or window family type, if so, correspondingly generating a corresponding door instance or a corresponding window instance at the wall body, if not, copying a new door family type or window family type according to the input door family or window family and the acquired door information or window information, and adding an attribute; step S50, judging whether the line segments of each door and window layer are processed or not, if not, executing step S20.
A third aspect of an embodiment of the present application provides a computer device comprising a memory, a processor and a computer program stored in the memory and executable on the computer device, the processor implementing the steps of a method of extracting CAD information to generate a wall model or a door window model when the computer program is executed.
A fourth aspect of the embodiments of the present application provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method for generating a wall model or a window model by extracting CAD information provided by the first or second aspect.
The method, the device and the medium for extracting CAD information to generate the wall model or the door window model have the following beneficial effects:
according to the embodiment of the application, the wall body model or the door window model with the same rule is automatically generated in batches by utilizing programming, so that the modeling efficiency and the modeling accuracy are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of a method for extracting CAD information to generate a wall model according to an embodiment of the present application;
fig. 2 is a flowchart of a method for extracting CAD information to generate a door and window model according to an embodiment of the present application;
fig. 3 is a block diagram of a computer device according to an embodiment of the present application.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Referring to fig. 1, fig. 1 shows a flowchart of a method for extracting CAD information to generate a wall model according to an embodiment of the present application. A method for extracting CAD information to generate a wall model comprises the following steps: step S1: reading the input information of the target model and the information of the built-in model, and selecting one wall layer of the preset model as a copying template; step S2: acquiring each line segment in the wall body image layer, and setting a parallel line label variable to initialize and mark each processed line segment; step S3: screening the remaining unidentified line segments; step S4: judging whether two line segments in the unidentified line segments are parallel or not, if so, generating a wall model between the two line segments, and adding identification processing to the two line segments, if not, executing a step S3; step S5: and judging whether each line segment is processed, if so, modifying the generated wall model according to the information of the target model input in the step S1, and if not, executing the step S2.
In detail, step S1 includes judging whether a family type of the wall model to be generated exists before selecting a wall layer of the preset model as a replication template, and if not, replicating a new wall family type and modifying the wall thickness; in the step S4, whether two line segments in the line segments which are not marked are parallel or not is judged, whether the distance between the line segments is consistent with the information of the target model input in the step S1 is specifically that whether the two line segments are parallel or not is firstly judged, then the distance between the two line segments is calculated, whether the positions between the two line segments are staggered or not is judged, if the condition of parallelism and non-staggering is met, and the distance value is consistent with the information of the input target model, the label of the line segment is substituted into the label variable of the correct line segment; and generating a wall model between the two line segments, namely successfully matching if the variable values of the parallel line labels are changed, obtaining two matched line segments, copying one line segment, taking a unit normal vector of the line segment pointing to the other line segment on the plane, and then enabling the copied line segment to move by half of the thickness along the normal vector direction, so as to obtain a middle line of the two line segments, and generating the wall model by using the middle line and the wall body family type.
In addition, in this embodiment, the method for extracting CAD information to generate a wall model is as follows:
firstly, all built-in elevations are acquired and transmitted to a front-end popup window for a user to select the bottom and top constraints of the wall model, and meanwhile, thickness, bottom and top offset information of the wall model to be generated can be input into the popup window. Then leading in the wall body layer in the CAD drawing to a system, obtaining all line segments of the wall body layer from the imported CAD drawing by the system, judging whether the family type of the wall body model to be generated exists or not, copying a new wall body family type and modifying the wall body thickness if the family type of the wall body model to be generated does not exist; and then, circularly reading all line segments (line segments A) of the wall layer, setting a parallel line label variable for initialization, circularly reading an unprocessed line segment (line segment B) in the circulation, judging whether the two line segments are parallel or not, calculating the distance between the two line segments, judging whether the positions between the two line segments are staggered or not, and substituting the label of the line segment into the correct line segment label variable if the parallel and non-staggered conditions are met and the distance value is equal to the thickness value input by a user. After the sub-cycle is finished, if the variable values of the parallel line labels are changed, the two matched line segments are successfully matched, one line segment is copied, a unit normal vector pointing to the other line segment on the plane is taken, then the copied line segment moves by half the thickness distance along the normal vector direction, so that an intermediate line of the two line segments is obtained, a wall model is generated by the intermediate line and the wall model, and finally the wall model is modified according to the information input by an initial user. Thus, the purpose of automatically generating wall models with the same rule in batches is achieved. In other embodiments, when generating the wall module, the middle line according to which the wall model is generated may be manually drawn and added when drawing the CAD drawing, and then a specific layer may be given for later recognition, which is not limited herein.
In detail, the mathematical model used in this embodiment is:
(1) judging whether the two line segments are parallel or not: and taking the unit vectors of the two line segments, and if the unit vector of one line segment is equal to the unit vector of the other line segment or the reverse quantity of the unit vector of the other line segment, the two line segments are parallel.
(2) Calculate the distance between a set of parallel lines: the distance from one point in a line (the midpoint) to the other edge is used, i.e., the area method. Taking the midpoint of the line segment A and two endpoints of the line segment B, and connecting to form two new line segments C, D; B. c, D three lines are connected end to form a triangle with the B line as the bottom and the length of the high line equal to the distance between the AB line, and the required distance can be obtained by utilizing a triangle area formula S=sqrt [ p (p-a) (p-B) (p-c) ], wherein a, B and c are triangle three-side lengths, p is triangle circumference, sqrt is square root, and after the area is calculated, the area is calculated by utilizing the high=area x 2/bottom.
(3) Judging whether a group of parallel line positions are staggered: the midpoint of a shorter line segment (one of the line segments is arbitrarily taken if the lengths are equal) in a set of parallel lines can be taken, the distance from the midpoint to the other side (the distance is equal to the distance between the midpoint and one end point of the other line segment if the positions are staggered) is calculated, and then the distance between two parallel lines is calculated, and if the two distances are unequal, the position staggering of the two parallel lines is indicated.
(4) Taking the normal vector of a line segment in a specified plane pointing to one parallel line of the line segment: firstly, obtaining a unit normal vector (X, Y, Z) of the line segment, wherein the Z coordinate of the line segment generated by CAD (computer aided design) import is 0, so that one (Y, -X, Z) of two normal vectors in a plane can be obtained according to a calculation formula of the normal vector, then taking one endpoint of the line segment and the midpoint of parallel lines thereof, generating a vector with the endpoint pointing to the midpoint, calculating the point multiplication of the two vectors, if the result is greater than zero, obtaining the normal vector as the obtained normal vector, otherwise, obtaining the inverse vector.
Referring to fig. 2, fig. 2 shows a flowchart of a method for extracting CAD information to generate a door and window model according to an embodiment of the present application. A method for extracting CAD information to generate a door and window model comprises the following steps: step S10: reading built-in door and window families and all door and window family types, selecting a built-in wall type as a copying template, acquiring a wall layer, each line segment and curve of the door and window layer and text information of the door and window information layer, reading bottom top constraint and bottom top offset of a wall where an input door and window is located, and selecting a first family type of the door and window family as the copying template; step S20: acquiring line segments of each door and window layer; step S30: judging whether the wall body is intersected with the line segments of the wall body layer at the same time, if not, executing the step S20, and if so, generating a wall body at the line segment formed by connecting the midpoints of the two line segments; step S40, judging whether the model of the door or window carried by the wall body generated in the step S30 has a corresponding door family type or window family type, if so, correspondingly generating a corresponding door instance or a corresponding window instance at the wall body, if not, copying a new door family type or window family type according to the input door family or window family and the acquired door information or window information, and adding an attribute; step S50, judging whether the line segments of each door and window layer are processed or not, if not, executing step S20.
In addition, in this embodiment, the method for extracting CAD information to generate a door and window model is as follows:
firstly prompting a user to click an imported CAD graph to obtain line segment curves of a wall layer, a door and window layer and texts of a door and window information layer, then obtaining all built-in elevations and door and window families, transmitting the built-in elevations and door and window families to a front popup window for the user to set bottom and top constraints of the wall and families corresponding to various door and window models, simultaneously inputting the bottom and top offsets of the wall and the ground clearance heights corresponding to various types of doors and windows at the popup window, and then obtaining the type of the wall family and the first family type of each door and window family as a copying template. And circularly reading line segments in the door and window layers, if the line segments are intersected with two line segments in the wall layer at the same time, the line segment A is the approximate position generated by the door and window, then the lengths of the line segments of the two wall layers intersected with the line segment A are taken as the wall thickness to copy a new wall body family type, two midpoints are taken to be connected into a line segment B, a wall body model where the door and window is located is generated by the line segment B and the wall body family type, and then the wall body model is modified according to information input by a user. According to the shape characteristics of the door and window in the CAD graph, if the line segment A intersects with any curve in the door and window graph layer, the position of the line segment A is a door model, and otherwise, the position is a window model. Determining the type of the door and window, circularly acquiring the text of the door and window information layer, calculating the distance between the text position and the line segment A, and acquiring the text closest to the line segment A, namely the type of the door or window. Judging whether the door or window group type corresponding to the model exists in the revit, if not, copying a new group type, setting the width and height dimensions of the doors and windows according to the model text, and placing the door and window model on the corresponding wall body according to the door and window group type.
Fig. 3 is a block diagram of a computer device according to 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 said memory 42 and executable on said processor 41, for example a program for a method of extracting CAD information to generate a wall model or a door and window model. The steps of the embodiments of the method for extracting CAD information to generate a wall model or a door or window model described above are implemented by the processor 41 when executing the computer program 43.
Illustratively, the computer program 43 may be partitioned into one or more modules that 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 performing the specified functions, which instruction segments describe the execution of the computer program 43 in the computer device 40.
The turntable device may include, but is not limited to, a processor 41, a memory 42. It will be appreciated by those skilled in the art that fig. 3 is merely an example of computer device 40 and is not intended to limit computer device 40, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., the turntable device may also include an input-output device, a network access device, a bus, etc.
The processor 41 may be a central processing unit (Central Processing Unit, CPU), 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 arrays (Field-12Programmable Gate Array,FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. 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 a memory of the computer device 40. The memory 42 may also be an external storage device of the computer device 40, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the computer device 40. Further, the memory 42 may also include both internal and external storage units of the computer device 40. The memory 42 is used for storing the computer program as well as other programs and data required by the turntable device. The memory 42 may also be used to temporarily store data that has been output or is to be output.
In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, which when executed by a processor implements the method of extracting CAD information to generate a wall model or a window model in the above embodiment.
Those skilled in the art will appreciate that all or part of the process for implementing the method for extracting CAD information to generate a wall model or a window model according to the above embodiments may be implemented by a computer program, which may be stored in a computer readable storage medium, and the computer program may include the process according to the embodiments of the above methods when executed. Any reference to memory, storage, database, or other computer-readable storage medium used in embodiments provided herein may include non-volatile and/or volatile memory. The 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 a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.
Claims (8)
1. A method for extracting CAD information to generate a wall model, comprising:
step S1: reading the input information of the target model and the information of the built-in model, and selecting one wall layer of the preset model as a copying template;
step S2: acquiring each line segment in the wall body image layer, and setting a parallel line label variable to initialize and mark each processed line segment;
step S3: screening the remaining unidentified line segments;
step S4: judging whether two line segments in the unidentified line segments are parallel or not, if so, generating a wall model between the two line segments, and adding identification processing to the two line segments, if not, executing a step S3;
step S5: and judging whether each line segment is processed, if so, modifying the generated wall model according to the information of the target model input in the step S1, and if not, executing the step S2.
2. The method of extracting CAD information to generate a wall model according to claim 1, wherein the information of the object model in step S1 includes thickness and bottom and top offset information of the wall model, and the information of the built-in model includes bottom and top constraints of the wall model.
3. The method of claim 1, wherein the step S1 of selecting a wall layer of the predetermined model as a replication template includes determining whether a family type of the wall model to be generated exists, and if not, replicating a new family type of the wall and modifying the wall thickness.
4. The method for extracting CAD information to generate a wall model according to claim 1, wherein in step S4, it is determined whether two of 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 is specifically that whether two line segments are parallel is determined first, then the distance between the two line segments is calculated, and then whether the positions between the two line segments are staggered is determined, and if the condition of parallelism and non-staggering is satisfied, and the distance value matches the information of the input target model, the label of the line segment is substituted into the correct line segment label variable.
5. The method of extracting CAD information to generate a wall model according to claim 4, wherein the wall model is generated between two line segments, specifically, if the variable values of the parallel line labels change, the two line segments are successfully matched, two matched line segments are obtained, one line segment is copied, a unit normal vector pointing to the other line segment on the plane is taken, then the copied line segment is moved by half the thickness along the normal vector direction, so that an intermediate line of the two line segments is obtained, and the wall model is generated according to the intermediate line and the wall family type.
6. A method of generating a door and window model by extracting CAD information, which matches a wall model generated by the method of generating a wall model by extracting CAD information as claimed in any one of claims 1 to 5, comprising:
step S10: reading built-in door and window families and all door and window family types, selecting a built-in wall type as a copying template, acquiring a wall layer, each line segment and curve of the door and window layer and text information of the door and window information layer, reading bottom top constraint and bottom top offset of a wall where an input door and window is located, and selecting a first family type of the door and window family as the copying template;
step S20: acquiring line segments of each door and window layer;
step S30: judging whether the wall body is intersected with the line segments of the wall body layer at the same time, if not, executing the step S20, and if so, generating a wall body at the line segment formed by connecting the midpoints of the two line segments;
step S40, judging whether the model of the door or window carried by the wall body generated in the step S30 has a corresponding door family type or window family type, if so, correspondingly generating a corresponding door instance or a corresponding window instance at the wall body, if not, copying a new door family type or window family type according to the input door family or window family and the acquired door information or window information, and adding an attribute;
step S50, judging whether the line segments of each door and window layer are processed or not, if not, executing step S20.
7. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 6 when the computer program is executed.
8. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any one of claims 1 to 6.
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| CN202310008828.0A CN116680768A (en) | 2023-01-04 | 2023-01-04 | Method, equipment and medium for extracting CAD information to generate wall model or door window model |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310008828.0A CN116680768A (en) | 2023-01-04 | 2023-01-04 | Method, equipment and medium for extracting CAD information to generate wall model or door window model |
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| CN202310008828.0A Pending CN116680768A (en) | 2023-01-04 | 2023-01-04 | Method, equipment and medium for extracting CAD information to generate wall model or door window model |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117252869A (en) * | 2023-11-15 | 2023-12-19 | 江西少科智能建造科技有限公司 | CAD drawing wall path information extraction method and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117252869A (en) * | 2023-11-15 | 2023-12-19 | 江西少科智能建造科技有限公司 | CAD drawing wall path information extraction method and system |
| CN117252869B (en) * | 2023-11-15 | 2024-03-12 | 江西少科智能建造科技有限公司 | CAD drawing wall path information extraction method and system |
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