CN116414316A - Illusion engine rendering method based on BIM model in digital city - Google Patents
Illusion engine rendering method based on BIM model in digital city Download PDFInfo
- Publication number
- CN116414316A CN116414316A CN202310679173.XA CN202310679173A CN116414316A CN 116414316 A CN116414316 A CN 116414316A CN 202310679173 A CN202310679173 A CN 202310679173A CN 116414316 A CN116414316 A CN 116414316A
- Authority
- CN
- China
- Prior art keywords
- model
- bim
- rendering
- layer
- data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000009877 rendering Methods 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000005457 optimization Methods 0.000 claims abstract description 19
- 230000002776 aggregation Effects 0.000 claims abstract description 9
- 238000004220 aggregation Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 22
- 238000002224 dissection Methods 0.000 claims description 3
- 238000009795 derivation Methods 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 12
- 230000006870 function Effects 0.000 description 11
- 238000013461 design Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008676 import Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011960 computer-aided design Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000013439 planning Methods 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012857 repacking Methods 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/061—Improving I/O performance
- G06F3/0611—Improving I/O performance in relation to response time
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/10—File systems; File servers
- G06F16/16—File or folder operations, e.g. details of user interfaces specifically adapted to file systems
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/10—File systems; File servers
- G06F16/17—Details of further file system functions
- G06F16/172—Caching, prefetching or hoarding of files
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/10—File systems; File servers
- G06F16/17—Details of further file system functions
- G06F16/173—Customisation support for file systems, e.g. localisation, multi-language support, personalisation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/061—Improving I/O performance
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0638—Organizing or formatting or addressing of data
- G06F3/0643—Management of files
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T15/00—3D [Three Dimensional] image rendering
- G06T15/10—Geometric effects
- G06T15/20—Perspective computation
- G06T15/205—Image-based rendering
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
- G06T17/05—Geographic models
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Data Mining & Analysis (AREA)
- Databases & Information Systems (AREA)
- Geometry (AREA)
- Computer Graphics (AREA)
- Software Systems (AREA)
- Computing Systems (AREA)
- Remote Sensing (AREA)
- Processing Or Creating Images (AREA)
Abstract
The invention provides a method for rendering a illusion engine based on a BIM model in a digital city, which relates to the technical field of image data processing and comprises the following steps: reading a datasmith model file by using Unreal; generating an HLOD-4 face-reduced low-mode aggregation layer; generating an original model collision body and mounting full BIM model data; separating all models according to the principle of surface unconnected so as to reduce the total number of the grid surfaces of a single model; dividing all the separated models according to the size so as to create LOD units; creating an LOD-1 fine model layer based on the original model; creating an LOD-2 reduced surface low-mode layer; creating an HLOD-3 secondary optimization layer; and integrating all the data, and enabling the Unreal to read the rendering data to perform BIM rendering. The virtual engine rendering method based on the BIM model in the digital city can improve rendering efficiency, avoid manually optimizing the model, avoid repeated labor and avoid BIM data loss.
Description
Technical Field
The invention relates to the technical field of image data processing, in particular to a method for rendering a illusion engine based on a BIM model in a digital city, and specifically relates to a method for efficiently rendering a Unreal graphic engine based on BIM model data importing in the digital city.
Background
BIM is a short term building information model (Building Information Modeling) which is a tool applied to architecture, engineering and civil engineering, and is used for performing computer aided design based on three-dimensional graphics. The core of BIM is to build a virtual three-dimensional building engineering model and provide a complete building engineering information base consistent with the actual situation for the model by utilizing a digitizing technology. The information base contains not only geometric information, professional attributes and state information describing building elements, but also state information of non-element objects (such as space, sports behavior). By means of the three-dimensional model containing the construction engineering information, the information integration degree of the construction engineering is greatly improved, and therefore a platform for engineering information exchange and sharing is provided for relevant stakeholders of the construction engineering project. In short, BIM technology is a datamation tool applied to engineering design, construction and management, and by integrating datamation and informatization models of buildings, sharing and transmitting are carried out in the whole life cycle process of project planning, operation and maintenance, so that engineering technicians can correctly understand and effectively respond to various building information, a cooperative work foundation is provided for design teams and construction subjects of all sides including buildings and operation units, and important effects are played in terms of improving production efficiency, saving cost and shortening construction period.
In the construction of digital cities, a large number of BIM models are used, which need to be imported into a illusion ENGINE (UNREAL ENGINE) tool such as "Unreal" for rendering for display. At present, the conventional technical processes mainly comprise two types:
scheme one: firstly, building a BIM model by using Revit software, then deriving an RVT model from the Revit, then importing the RVT model into 3DMax for optimization, then deriving a DataSmith model from the 3DMax, and then importing the DataSmith model into Unreal; scheme II: the BIM model is first created using Revit software, then the DataSmith model is derived from Revit, and then the DataSmith model is imported into Unreal.
In the two technical schemes, since the Unreal is a graphic rendering engine constructed based on a game, the special optimization is not performed in the initial stage by considering huge BIM model data volume, the number of components contained in five major professions of building, structure, water, heating and electricity of a single BIM model is basically tens of thousands, the total number of triangular faces of a single component is tens of thousands, rendering load is very high, and rendering frame rate is always lower than 30 frames of normal use frame rate when the BIM model enters the Unreal, and smooth operation and viewing cannot be realized. In order to enable BIM models to run smoothly in Unreal, most enterprises spend a great deal of labor cost to optimize the models or change business schemes, so that a great deal of models are prevented from being rendered simultaneously, but the models are finally used at a lower frame rate, and initial expectations cannot be achieved. The prior art scheme has the following problems:
1. low efficiency rendering: the rendering order of each frame is too huge, so that rendering instructions are too many, the CPU is occupied fully, the frame rate is extremely low, and the single-digit frame rate is conventional.
2. BIM model optimization human cost is high: the model optimization cost is very high, and if the whole model is light, the BIM model with the total number of about 3 ten thousand components needs to pay out optimization time of 40 hours for a single person and does not contain problem solution.
3. BIM data loss: when the conventional model is light, the model merging operation is performed, so that the full BIM information cannot be correctly reserved, the model is separated from the BIM principle, and the pseudo-digital operation is performed.
4. Material efficiency is low, and no function: the material rendering efficiency is low, versions are incompatible, and the custom BIM function can be used only by manually replacing the versions one by one.
5. The import/update cost is high: the BIM model is imported to the Unreal engine through multiple rounds of conversion/optimization, the importing time is long, the BIM model is unstable and easy to crash, when the BIM model data is updated, old data needs to be deleted and imported again, the time and labor cost are extremely high, repacking is needed during updating, and the efficiency is extremely low.
Disclosure of Invention
The invention aims to at least partially overcome the defects of the prior art and provides a illusion engine rendering method based on a BIM model in a digital city.
The invention also aims to provide a illusion engine rendering method based on the BIM model in the digital city, which improves the rendering efficiency.
The invention also aims to provide a illusion engine rendering method based on the BIM model in the digital city, so that the model can be prevented from being optimized manually and repeated labor is avoided.
The invention also aims to provide a illusion engine rendering method based on the BIM model in the digital city, so as to avoid the problem of BIM data loss.
In order to achieve one of the above objects or purposes, the technical solution of the present invention is as follows:
a illusion engine rendering method based on a BIM model in a digital city, the rendering method comprising:
step 100: reading a datasmith model file by using Unreal;
step 200: generating an HLOD-4 face-reduced low-mode aggregation layer;
step 300: generating an original model collision body and mounting full BIM model data;
step 400: separating all models according to the principle of surface unconnected so as to reduce the total number of the grid surfaces of a single model;
step 500: dividing all the separated models according to the size so as to create LOD units;
step 600: creating an LOD-1 fine model layer based on the original model;
step 700: creating an LOD-2 reduced surface low-mode layer;
step 800: creating an HLOD-3 secondary optimization layer; and
step 900: and integrating all the data, and enabling the Unreal to read the rendering data to perform BIM rendering.
According to a preferred embodiment of the present invention, before the step 100, the rendering method further comprises:
step A: creating a BIM model by using Revit; and
and (B) step (B): and exporting the manufactured BIM model into a datasmith model file by using a Revit model export tool.
In accordance with a preferred embodiment of the present invention, in step 100, the Unreal reads the datasmith model file in a multi-threaded full core full load operation.
According to a preferred embodiment of the invention, the datasmith model file consists of a model map and a udsmesh model mesh.
According to a preferred embodiment of the present invention, the Revit model derivation tool is a Unreal-Revit-DataSmith plugin.
According to a preferred embodiment of the present invention, the generating the HLOD-4 reduced surface low-modulus aggregation layer includes merging and reducing all files read in step 100 into the HLOD-4 layer for storage.
In accordance with a preferred embodiment of the present invention, in the step 700, an open source subtractive surface library is used to reduce rendering costs.
According to a preferred embodiment of the present invention, after the step 800 and before the step 900, the rendering method further comprises:
and obtaining an original model material map, generating an example material, putting the example material into the main map, and comprising a BIM function.
According to a preferred embodiment of the invention, the HLOD-3 secondary optimization layer is intermediate to the HLOD-4 reduced-plane low-mode aggregation layer and the LOD-2 reduced-plane low-mode layer.
According to a preferred embodiment of the invention, the BIM functions include color overlay and/or model dissection.
The invention has the beneficial effects that: the invention discloses a virtual engine rendering method based on a BIM model in a digital city, which aims at BIM model data, multithreading full-core full-load file reading, integrates all data, enables rendering data special for Unreal reading to be subjected to BIM rendering with high efficiency, greatly improves the rendering efficiency, avoids the problem of BIM data loss, comprehensively and automatically avoids manual optimization of the model, avoids repeated invalid labor, directly avoids labor cost caused by data updating by adopting dynamic loading DataSmith file logic, and realizes the latest efficient use logic after loading without deleting imported updating operation.
Drawings
FIG. 1 illustrates a conventional technical flow of a BIM model importation illusion engine in the prior art;
fig. 2 is a flowchart of a illusion engine rendering method based on a BIM model in a digital city according to an embodiment of the present invention.
Description of the embodiments
Exemplary embodiments of the present invention are described in detail below with reference to the attached drawing figures, wherein the same or similar reference numerals denote the same or similar elements. Furthermore, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in the drawings in order to simplify the drawings.
In the description of the present disclosure, several common technical term expressions are referred to, including RVT models, revit, dataSmith, BIM, UE, unreal, 3DMAX, LOD, HLOD, which for clarity are first described:
RVT model: the RVT model is a model format specific to Revit software, which is introduced by Autodesk, inc., for storing BIM model data.
Revit: revit is the name of a set of software of Autodesk, which is built for Building Information Model (BIM) and can help building designers to design, build and maintain buildings with better quality and higher energy efficiency.
DataSmith (universal official document): datasmith is a collection of tools and plugins that can import complete pre-built scenarios and complex resources created using various industry standard design applications into the illusion engine.
BIM: BIM is a short name of a building information model (Building Information Modeling), BIM technology is proposed by Autodesk company in 2002, has been widely accepted in industry, and can help to integrate building information, various information is always integrated in a three-dimensional model information database from the design, construction and operation of a building to the end of the whole life cycle of the building, and personnel of various parties such as a design team, a construction unit, a facility operation department and a business owner can work cooperatively based on BIM, so that the working efficiency is effectively improved, resources are saved, the cost is reduced, and sustainable development is realized. The core of BIM is to build a virtual three-dimensional building engineering model and provide a complete building engineering information base consistent with the actual situation for the model by utilizing a digitizing technology. The information base contains not only geometric information, professional attributes and state information describing building elements, but also state information of non-element objects (such as space, sports behavior). By means of the three-dimensional model containing the construction engineering information, the information integration degree of the construction engineering is greatly improved, and therefore a platform for engineering information exchange and sharing is provided for relevant stakeholders of the construction engineering project.
UE and ureal: UE and ureal are shorthand for Unreal ENGINE, developed by Epic, one of the most well-known game ENGINEs in the world.
3DMAX: the 3D Studio Max, often abbreviated as 3DMax or 3ds Max, is 3D modeling rendering and fabrication software based on a PC system developed by dispeet corporation. The precursor is 3D Studio family software based on DOS operating system. Before Windows NT appears, industrial-grade CG production was monopolized by SGI graphics workstations. The presence of the 3D Studio Max + Windows NT combination reduces the CG production threshold by first starting the animation that is used in the computer game, and then further starting the special effects production that participates in the video.
LOD: LOD technology, i.e., level of Detail, is abbreviated to multi-level of Detail. The LOD technology is to determine the resource allocation of object rendering according to the position and importance of the nodes of the object model in the display environment, and reduce the number of planes and the detail of non-important objects, so as to obtain high-efficiency rendering operation.
HLOD (universal official document, hierarchical Level of Detail): a complex checkpoint in the illusion engine may contain hundreds of static grid body assets with rich detail. For this level of detail, loading a square round kilometer of checkpoints at a time can be very slow. When the model is at a distance, a hierarchical level of detail (HLOD) system may merge multiple static mesh operators into a single proxy mesh and material. This can reduce the number of actors that need to be rendered in a scene, thereby reducing the number of draw calls per frame and improving performance, which is particularly useful when dealing with large open world.
According to the general inventive concept, the invention provides a phantom engine rendering method based on a BIM model in a digital city, and the phantom engine rendering method aims at a Unreal rendering mode, automatically creates up to 4 layers of special LOD/HLODs for optimization during loading, improves high-efficiency rendering under various lens distances, improves frame rate by 10 times or more under the same model condition, and can easily reach the common 60-frame/second rendering speed of a game. Meanwhile, the loading is carried out by using an open source face-reducing library simultaneously to automatically reduce the face, so that the labor cost is completely separated, and the problem of broken faces and messy faces is solved. And aiming at the problem of BIM data loss, reconstructing a collision body of an original fine model in the loading process, independently storing the whole BIM data, avoiding data loss after model combination, increasing the data query speed, and completely separating rendering and data storage. In order to be compatible with various formats, the original material is provided with a plurality of invalid nodes, so that rendering efficiency is extremely low and no function exists. In addition, the method is used for dynamically loading the DataSmith model, does not have the load of updating the model, uses multithreading, has extremely high loading time efficiency, greatly improves the time cost of repeated multiplexing by full-core multithreading, spans the cost of manually updating the model, supports multiple versions, and greatly weakens the labor cost.
The invention relates to a method for rendering a illusion engine based on a BIM model in a digital city, which specifically comprises the following steps:
step A: creating a BIM model by using Revit;
and (B) step (B): exporting the manufactured BIM model into a datasmith model file by using a Revit model export tool;
step 100: reading a datasmith model file by using Unreal;
step 200: generating an HLOD-4 face-reduced low-mode aggregation layer;
step 300: generating an original model collision body and mounting full BIM model data;
step 400: separating all models according to the principle of surface unconnected so as to reduce the total number of the grid surfaces of a single model;
step 500: dividing all the separated models according to the size so as to create LOD units;
step 600: creating an LOD-1 fine model layer based on the original model;
step 700: creating an LOD-2 reduced surface low-mode layer;
step 800: creating an HLOD-3 secondary optimization layer; and
step 900: and integrating all the data, and enabling the Unreal to read the rendering data to perform BIM rendering.
The invention is described in detail below in connection with a specific embodiment that derives an optimal BIM loading strategy for a digital city that requires importing BIM model data based blueprint.
1. Creating BIM models using Revit
Five major specialty buildings, structures, water, heating, electricity are well known in the industry using Revit. The Revit series software is built for a Building Information Model (BIM), and can help building designers to design, build and maintain buildings with better quality and higher energy efficiency.
2. And exporting the manufactured BIM model into a DataSmith model by using a Unreal-Revit-dataSmith plugin.
The current file is exported as a datasmith model file using a Revit model export tool provided by the Unreal official.
3. And reading the datasmith model file by using Unreal, and reading by adopting a multithreading full-core full-load file mode. The datasmith model file consists of a model map (png, jpg, jpeg and other picture formats) and a udsmesh model grid, and in order to improve the loading speed, the invention adopts a multithreading (c++ native) file reading strategy, thereby greatly improving the file reading efficiency, enabling the file in the hard disk to be read into a memory (RAM) at the fastest speed, and facilitating the subsequent call. The game engine is rendered as single-thread operation by default, but the file reading can be carried out by full cores in a multi-thread mode, so that the loading speed is greatly improved, and the clamping caused by loading is avoided.
4. An HLOD-4 reduced surface low-modulus aggregation layer is generated, which serves for remote rendering. All the files read by the Unreal are combined and subtracted to be stored as an HLOD-4 layer, so that the efficiency in long-distance rendering is improved, the clamping is avoided, and the rendering efficiency is improved by 10 times or more in the conventional case. For a substantial amount of BIM model rendering, a Unreal-specific HLOD-4 rendering level is made, serving the remote rendering.
5. Generating an original model collision body and mounting the full BIM data. The principle of acquiring data in Unreal is that the collision body is detected by rays and the data of the collision body is read, all models are processed into four layers of LOD/HLOD data, the whole process is rendered alternately, the collision body acquired by special data is specially generated in order to avoid abnormal data acquisition, the collision body does not appear as a rendering unit, and the problem of low rendering frame rate is effectively avoided. In order to avoid the problem of loss caused by merging BIM data, a collision body of special data bearing is generated, so that the data reading efficiency is improved, and the rendering cost is reduced.
6. All models are separated according to the principle of surface unconnected so as to reduce the total number of grid surfaces of a single model. There may be multiple disconnected models within the structure, for example: the fire hydrant door, the fire hydrant body and the fire hydrant frame are independent individuals, so that the number of the single component surfaces is prevented from being too large, the single CPU rendering instruction load is reduced, and the performance is effectively improved. The Revit modeling uses a family library concept, so that the cost of a modeler for creating a model is reduced, but a plurality of independent grid individuals are caused to appear in a single component, and in order to effectively reduce the total number of triangular faces of the single component, separation is carried out, so that the subsequent effective rendering is facilitated.
7. All the separated models are segmented according to size so as to create LOD units. After the original model is separated, the original model is divided according to a certain size unit, so that the data can be conveniently used in the subsequent LOD unit creation. The separated model is divided in unit volume, so that the cost of subsequent LOD creation is reduced, and the LOD creation efficiency of directly creating the LOD can be greatly improved by secondary LOD creation of basic division data.
8. And creating an LOD-1 fine model layer based on the original model, wherein the model is used for looking at the nearest distance, and the layer is used for looking at a component at the nearest distance, so that the reality is ensured, and the overhigh rendering cost is avoided. This layer creates a hybrid rendering for close-up viewing of the component, and other layers LOD/HLOD.
9. An LOD-2 reduced surface low-modulus layer is created, and an open source reduced surface library is used to reduce rendering costs. The layer is used for checking the model at a medium and close distance, carrying out face reduction reconstruction under the condition of not influencing the authenticity of the model, ensuring the magnitude and improving the rendering efficiency. The LOD-2 layer is adopted by surrounding components to effectively render while the LOD-1 plays a role, so that the cost is reduced, the rendering efficiency is improved, and the clamping is avoided.
10. A HLOD-3 secondary optimization layer is created that serves medium range batch rendering. The layer is used for merging rendering at a medium distance, automatically generates a merging model, effectively reduces CPU rendering instruction magnitude in the medium distance, and efficiently performs batch rendering. The layer is arranged between the HLOD-4 layer and the LOD-2 layer, so that the distance is prevented from being created under the current embarrassing condition, and the distance is complemented by other three layers of LOD/HLODs.
11. And obtaining an original model material map, generating an example material, putting the example material into the main map, and comprising a BIM function. And (3) creating a special BIM model material, extracting an original material map, and performing function integration under the condition of not interfering with the original map, so that the cost of manual secondary operation is directly avoided, and the loading is performed without secondary operation. The BIM function includes color overlay and/or model dissection. The material functions (such as color superposition, model sectioning and the like) occupy a very large proportion in the BIM, and since Revit does not consider the problem of up-down compatibility in the version upgrading process, unreal cannot perform a proper material compatible system, the invention creates nodes compatible with up-down versions in the basic material, and effectively reduces the cost of model secondary export import caused by version iteration.
Unreal rendering: and integrating all data, so that rendering data special for Unreal reading is subjected to BIM rendering with high efficiency.
The invention has the beneficial effects that: the invention discloses a virtual engine rendering method based on a BIM model in a digital city, which aims at BIM model data, multithreading full-core full-load file reading, integrates all data, enables rendering data special for Unreal reading to be subjected to BIM rendering with high efficiency, greatly improves the rendering efficiency, avoids the problem of BIM data loss, comprehensively and automatically avoids manual optimization of the model, avoids repeated invalid labor, directly avoids labor cost caused by data updating by adopting dynamic loading DataSmith file logic, and realizes the latest efficient use logic after loading without deleting imported updating operation. Specifically, the method comprises the following steps:
the advantages are as follows: the rendering efficiency is improved by 10 times and more, so that users can use BIM functions in a platform compatible with the invention with high efficiency;
the advantages are as follows: BIM model optimization manpower cost is equal to 0, manual model optimization is avoided comprehensively and automatically, and repeated ineffective labor is avoided;
the method has the following advantages: the method directly avoids the problem of BIM data loss and achieves 100% of original data;
the advantages are four: the material optimization rendering is high in efficiency, the original DataSmith material is replaced, the material rendering efficiency is greatly optimized, the BIM material function group basis is increased, and the box is opened for use;
fifth advantage is: the invention adopts dynamic loading of the DataSmith file logic to directly avoid the labor cost caused by data updating, does not need the updating operation imported after deletion, and loads the latest high-efficiency use logic.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention. The scope of applicability of the present invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A illusion engine rendering method based on a BIM model in a digital city, the rendering method comprising:
step 100: reading a datasmith model file by using Unreal;
step 200: generating an HLOD-4 face-reduced low-mode aggregation layer;
step 300: generating an original model collision body and mounting full BIM model data;
step 400: separating all models according to the principle of surface unconnected so as to reduce the total number of the grid surfaces of a single model;
step 500: dividing all the separated models according to the size so as to create LOD units;
step 600: creating an LOD-1 fine model layer based on the original model;
step 700: creating an LOD-2 reduced surface low-mode layer;
step 800: creating an HLOD-3 secondary optimization layer; and
step 900: and integrating all the data, and enabling the Unreal to read the rendering data to perform BIM rendering.
2. The method of claim 1, further comprising, prior to the step 100:
step A: creating a BIM model by using Revit; and
and (B) step (B): and exporting the manufactured BIM model into a datasmith model file by using a Revit model export tool.
3. The illusion engine rendering method based on the BIM model in the digital city according to claim 2, wherein:
in the step 100, the Unreal reads the datasmith model file in a multithreaded full core full load operation.
4. The illusion engine rendering method based on the BIM model in the digital city according to claim 3, wherein:
the datasmith model file consists of a model map and a udsmesh model grid.
5. The method of phantom engine rendering based on BIM models in digital cities according to claim 4, wherein:
the Revit model derivation tool is a Unreal-Revit-DataSmith plugin.
6. The method of phantom engine rendering based on BIM models in digital cities according to claim 5, wherein:
generating the HLOD-4 reduced surface low-modulus aggregation layer comprises combining and reducing all files read in the step 100 to be the HLOD-4 layer for storage.
7. The illusion engine rendering method based on the BIM model in the digital city according to claim 6, wherein:
in the step 700, an open source reduced surface library is used to reduce rendering costs.
8. The method of claim 7, further comprising, after step 800 and before step 900:
and obtaining an original model material map, generating an example material, putting the example material into the main map, and comprising a BIM function.
9. The illusion engine rendering method based on the BIM model in the digital city according to claim 8, wherein:
the HLOD-3 secondary optimization layer is arranged between the HLOD-4 face-reduction low-mode aggregation layer and the LOD-2 face-reduction low-mode layer.
10. The illusion engine rendering method based on the BIM model in the digital city according to claim 8, wherein:
the BIM function includes color overlay and/or model dissection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310679173.XA CN116414316B (en) | 2023-06-08 | 2023-06-08 | Illusion engine rendering method based on BIM model in digital city |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310679173.XA CN116414316B (en) | 2023-06-08 | 2023-06-08 | Illusion engine rendering method based on BIM model in digital city |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116414316A true CN116414316A (en) | 2023-07-11 |
| CN116414316B CN116414316B (en) | 2023-12-22 |
Family
ID=87054646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310679173.XA Active CN116414316B (en) | 2023-06-08 | 2023-06-08 | Illusion engine rendering method based on BIM model in digital city |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116414316B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117235869A (en) * | 2023-11-09 | 2023-12-15 | 中国铁路设计集团有限公司 | BIM and rendering engine-based urban rail engineering intelligent multidimensional display system |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107193911A (en) * | 2017-05-14 | 2017-09-22 | 北京比目鱼工程咨询有限公司 | A kind of three-dimensional visualization engine and WEB application routine call method based on BIM models |
| KR102017075B1 (en) * | 2018-12-28 | 2019-09-03 | 한국건설기술연구원 | the virtual reality simulation platform based BIM data and the virtual reality simulation method using the same |
| CN111617480A (en) * | 2020-06-04 | 2020-09-04 | 珠海金山网络游戏科技有限公司 | Point cloud rendering method and device |
| CN112070909A (en) * | 2020-09-02 | 2020-12-11 | 中国石油工程建设有限公司 | Engineering three-dimensional model LOD output method based on 3D Tiles |
| CN112419499A (en) * | 2020-11-14 | 2021-02-26 | 中国科学院电子学研究所苏州研究院 | Immersive situation scene simulation system |
| CN113498532A (en) * | 2020-01-21 | 2021-10-12 | 京东方科技集团股份有限公司 | Display processing method, display processing device, electronic apparatus, and storage medium |
| CN114082191A (en) * | 2022-01-18 | 2022-02-25 | 四川省交通勘察设计研究院有限公司 | Game engine visual interaction method based on BIM design |
| CN114283231A (en) * | 2021-12-27 | 2022-04-05 | 奥格科技股份有限公司 | LOD-based BIM model lightweight construction and display method |
| CN115661327A (en) * | 2022-12-09 | 2023-01-31 | 北京盈建科软件股份有限公司 | Distributed virtual node rendering method and device of BIM (building information modeling) platform graphic engine |
-
2023
- 2023-06-08 CN CN202310679173.XA patent/CN116414316B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107193911A (en) * | 2017-05-14 | 2017-09-22 | 北京比目鱼工程咨询有限公司 | A kind of three-dimensional visualization engine and WEB application routine call method based on BIM models |
| KR102017075B1 (en) * | 2018-12-28 | 2019-09-03 | 한국건설기술연구원 | the virtual reality simulation platform based BIM data and the virtual reality simulation method using the same |
| CN113498532A (en) * | 2020-01-21 | 2021-10-12 | 京东方科技集团股份有限公司 | Display processing method, display processing device, electronic apparatus, and storage medium |
| CN111617480A (en) * | 2020-06-04 | 2020-09-04 | 珠海金山网络游戏科技有限公司 | Point cloud rendering method and device |
| CN112070909A (en) * | 2020-09-02 | 2020-12-11 | 中国石油工程建设有限公司 | Engineering three-dimensional model LOD output method based on 3D Tiles |
| CN112419499A (en) * | 2020-11-14 | 2021-02-26 | 中国科学院电子学研究所苏州研究院 | Immersive situation scene simulation system |
| CN114283231A (en) * | 2021-12-27 | 2022-04-05 | 奥格科技股份有限公司 | LOD-based BIM model lightweight construction and display method |
| CN114082191A (en) * | 2022-01-18 | 2022-02-25 | 四川省交通勘察设计研究院有限公司 | Game engine visual interaction method based on BIM design |
| CN115661327A (en) * | 2022-12-09 | 2023-01-31 | 北京盈建科软件股份有限公司 | Distributed virtual node rendering method and device of BIM (building information modeling) platform graphic engine |
Non-Patent Citations (1)
| Title |
|---|
| 曾文驱，张泽州，邓卓平: "地铁BIM模型Web端轻量化策略及加载优化方法研究", 《计算机应用》, vol. 32, no. 5, pages 26 - 31 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117235869A (en) * | 2023-11-09 | 2023-12-15 | 中国铁路设计集团有限公司 | BIM and rendering engine-based urban rail engineering intelligent multidimensional display system |
| CN117235869B (en) * | 2023-11-09 | 2024-02-06 | 中国铁路设计集团有限公司 | BIM and rendering engine-based urban rail engineering intelligent multidimensional display system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116414316B (en) | 2023-12-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108710739B (en) | Method and system for building information model lightweight and three-dimensional scene visualization | |
| Childs et al. | A contract based system for large data visualization | |
| CN101916299B (en) | Three-dimensional spatial data storage and management method based on file system | |
| CN102103497B (en) | Finite state machine actuating device and method, and method for establishing and using finite state machine | |
| JP3870167B2 (en) | Rendering system, rendering method and recording medium thereof | |
| US20080094394A1 (en) | Automated derivative view rendering system | |
| CN116414316B (en) | Illusion engine rendering method based on BIM model in digital city | |
| CN109885626A (en) | Urban construction digital archives intelligent management system based on structural data and BIM model | |
| US20100179788A1 (en) | System and method for hybrid solid and surface modeling for computer-aided design environments | |
| CN111858618A (en) | BIM data graphic engine | |
| CN112017287A (en) | Three-dimensional parametric modeling and efficient rendering method for underground cable facilities | |
| CN115795629A (en) | Data conversion method, data conversion system and electronic equipment | |
| CN116310143A (en) | Three-dimensional model construction method, device, equipment and storage medium | |
| CN109858059B (en) | Application method of virtual reality technology based on CAD (computer-aided design) super-large model in hydropower station simulation | |
| CN114254238A (en) | Three-dimensional Web modeling platform based on digital twinning | |
| CN116502303B (en) | BIM model visualization method based on scene hierarchy instance information enhancement | |
| CN112704872A (en) | Scene data synchronization method, device, system and storage medium | |
| CN115984499A (en) | Two-three-dimensional integrated GIS system based on Maptalks | |
| CN117372662A (en) | Three-dimensional model light weight method based on complex equipment | |
| CN111599014B (en) | Method, system and medium for rendering OBJ file analysis surface based on Unity3D | |
| Ding et al. | Lightweight display of railway four-electricity BIM model based on glTF format and WebGL technology | |
| Ding et al. | Strategies for the Collaborative Use of CAD Product Models | |
| CN115512047A (en) | Coordinate conversion method of multi-structure live-action three-dimensional model | |
| CN115422193B (en) | Storage method, system and medium for multi-source data of city information model | |
| Tang et al. | A high-efficiency data compression and visualization method for large complex BIM model |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |