The reason why BIM complex and large models need to be lightweight
There are several reasons why BIM complex large models need to be lightweight:
1. Hardware Performance Limitations:
- BIM large models often contain massive amounts of data, including geometric information, material information, attribute information, progress information, cost information, etc. This data takes up a lot of computer memory and storage space.
- For general computer hardware, processing such a large amount of data will lead to performance degradation, such as slow loading speed, rendering lag, etc., which will affect the user's experience.
2. Improve the efficiency of software operation:
- Lightweight BIM models can reduce the computational resources required by the software to process the model, such as CPU and GPU usage.
- By reducing the amount of data and optimizing the model structure, the software can load, render, and analyze models faster, increasing productivity.
3. Promote multi-discipline collaboration:
- In large-scale projects, multi-discipline collaborative design is one of the core advantages of BIM technology. However, the huge BIM model will bring difficulties to data exchange and collaboration between multiple disciplines.
- Lightweight BIM models can reduce the cost of data transmission and sharing, and promote collaborative work between multiple disciplines.
4. Support mobile apps:
- With the proliferation of mobile devices, more and more users want to view, analyze, and manipulate BIM models on mobile devices.
- Lightweight BIM models can adapt to the hardware performance of mobile devices to provide a smoother user experience.
5. Support cloud services and big data analysis:
- Cloud computing and big data analysis are one of the important directions for the development of BIM technology. However, the huge BIM model will bring challenges to cloud services and big data analysis.
- Through lightweight processing, BIM models can be uploaded to cloud servers, and cloud computing resources can be used for efficient analysis and processing.
6. Adapt to different application scenarios:
- BIM models require different levels of accuracy and detail for different application scenarios. For example, in the preliminary design phase, it may only be necessary to focus on the overall building layout and massing relationship; In the design development phase, it is necessary to pay attention to more specific details and material selection.
- Lightweight BIM models can be customized and optimized according to different application scenarios to meet the needs of different stages.
A method for lightening the weight of BIM complex large models
The lightweighting of BIM's complex large models is critical to increase processing speeds, reduce hardware requirements, and optimize the collaboration experience. The following are several effective ways to lighten the weight of BIM complex large models.
BIM complex and large model lightweighting method
1. Point cloud data compression: By intelligently compressing the point cloud data in the BIM model to remove redundancy and unnecessary details, the storage requirements of the model can be significantly reduced, and the loading and rendering speed can be improved.
2. Triangular simplification: On the premise of maintaining the appearance and key features of the model, the number of triangular surfaces in the model is automatically reduced through the algorithm, and the complexity and polygon number of polygons of the model are reduced. This helps speed up rendering and reduces the use of computing resources.
3. Texture data optimization: Compress and optimize the texture map in the BIM model to reduce the resolution and color depth of the texture, thereby reducing the storage space and memory usage. At the same time, optimizing the loading method of textures, such as using streaming loading, can further improve the loading efficiency of the model.
4. Geometric data simplification: The simplification algorithm is used to simplify the geometry in the BIM model, such as edge folding, vertex deletion, etc., to reduce the level of detail and complexity of the model. This simplification can greatly improve the processing speed of the model while maintaining the appearance quality of the model.
5. Hierarchical Detail Model (LOD): Create hierarchical detail models with different accuracy for the BIM model according to the needs of the project and the observation distance. Use a lower-precision LOD model at a distance or with low accuracy requirements to reduce computational load and storage footprint.
6. Remove redundant data: In BIM models, there are often some redundant data that have no impact on the final result, such as temporary files, unused materials, etc. By cleaning up this redundant data, you can further reduce the complexity and storage requirements of your model.
7. Data compression and encoding: Use efficient data compression algorithms and encoding methods, such as GZIP, ZIP, lossless data compression, etc., to compress the data of BIM models. This can significantly reduce the storage space and transfer time of the model without losing information.
8. Distributed storage and rendering: Utilize cloud computing and distributed rendering technology to distribute the storage and rendering tasks of BIM models to multiple computers or servers. With parallel processing, the loading speed and rendering performance of the model can be significantly improved.
However, the implementation of the above-mentioned lightweight methods involves complex issues such as data compression algorithms, model simplification techniques, and data compatibility and conversion, and the implementation is very complex.
In order to simplify the BIM model data more quickly and easily, and realize the visualization of the complex BIM model on the Web side, many design institutes and construction units will choose to use professional lightweight engines, such as EIM lightweight display engine.
Through built-in efficient algorithms and optimization technologies, the EIM lightweight display engine can automatically handle issues such as data compression, model simplification, and data compatibility, greatly simplifying the lightweight process and improving work efficiency. At the same time, it also supports the visualization function of the web side, making it easier for the BIM model to be browsed and interacted with on the web page.
It should be noted that in the lightweight process, the precision and accuracy of the model should be ensured, and the data redundancy and useless information should be reduced as much as possible to achieve efficient, accurate and smooth model display and rendering. At the same time, it is necessary to select appropriate processing methods and algorithms according to the characteristics of the model and application scenarios.
The best way to lightweight BIM complex large models
EIM (Engineering Information Modeling) is a PaaS cloud platform that focuses on solving the problem of building data management and reuse. It provides services such as 3D building model analysis and web visualization, building life cycle data management, and building data and geographic information data fusion.
As a professional-level underlying development platform for building data management and application, EIM maps physical buildings in the real world to the virtual world to form a "digital twin", so that buildings can form self-contained, self-displayed, and self-service capabilities, helping users quickly respond to complex business scenario requirements.
Software structure
EIM includes three major sections: data management, 3D management, and BIM + GIS management.
1. Data management: Provide a standard data management method for BIM, and realize the full life cycle management of building data such as documents, projects, design data, schedules, equipment, communication, organization, personnel and permissions through custom business data models and standardized data access interfaces.
2. 3D management: including EIM3D 3D processing engine and 3D visualization engine, providing one-stop 3D visualization service from model uploading, analysis to front-end rendering, with IFC, Revit, iModel, OBJ, DAE, FBX and other international BIM models and common DWG two-dimensional drawing analysis services, forming a complete set of model component database, and supporting 3D display and interactive operation on the PC and mobile terminals, while providing service layer API and JavaScript API supports secondary development.
3. BIM+GIS management: As a BIM+GIS oriented data management and application development platform, it integrates the complete data of GIS scenes and BIM models to realize the integrated browsing of indoor and outdoor, above ground and underground.
Software core technology
1. EIM3D 3D engine
On the one hand, it opens up the closed BIM data format of various software vendors, and on the other hand, it establishes a bridge between the developers of the whole process of building information and decision-making systems and the huge building standard system, and lowers the threshold for software developers to enter the knowledge field of construction.
Through the support of international and domestic common civil and industrial building model formats, EIM3D converts the geometric data in BIM into the triangular format supported by most software, fuses attribute data with components as granularity, and finally provides developers with RESTful data interface APIs and 3D model browsing components, which reduces developers' understanding of complex buildings and various model formats, and also reduces developers' requirements for architectural 3D visualization.
EIM3D lightens BIM through component interoperability, data compression, on-demand loading and other methods, so that conventional computers, mobile phones, pads, etc. can view BIM online through WebGL-enabled browsers, which greatly reduces the software and hardware requirements for BIM use.
2. Data platform
EIM has a robust data platform that consists of a building database and a configurable data model.
1) Building databases
Due to the characteristics of 3D graphics with various data storage formats, small data volume of single component and large amount of data of the whole graph, it is difficult for relational databases to be competent. In order to meet the complex and volatile data structure storage requirements of building databases, our company has developed EIM building database - multi-model database, which is used to solve the storage and management problems of different types of building data, such as 3D geometric data, documents, structured data and relational data, and freely realize personalized customization needs.
The EIM building database supports flexible data structure storage and can be mixed. Compared with traditional relational databases, EIM building databases can process 3D geometric data faster. It takes up less storage space than a document-based database.
EIM Architecture Database supports SQL-like AQL query language to achieve fast query of data and is easy to use. At the same time, it also has a built-in extensible data model and basic API in the field of construction engineering.
2) Configurable data model
EIM is embedded with a set of common data models and APIs in the field of construction engineering, allowing users to customize the data model and provide a set of methods for defining data. Based on the rules of EIM to define data, users can arbitrarily expand into a data model that meets their own needs, including personalized configuration of object classes, relationship classes, attributes, etc., to meet the development requirements of different types of applications.
EIM currently consists of two types of services, namely data interface services and business services. The data interface service is mainly responsible for providing general interfaces for various structured and unstructured data access. Business services provide interfaces to specific EIM service components.
3. Integration of BIM and GIS
EIM's BIM+GIS fusion technology can build the most basic and core urban basic database required by smart cities, and serve as a platform for urban access and carrying of various smart information. EIM provides multi-source 2D and 3D GIS data and BIM model uploading, analysis, data integration, browsing interaction and management, and seamlessly integrates BIM fine data with GIS large scene data through spatial location, so as to realize the integrated browsing and interaction of indoor and outdoor, aboveground and underground on the browser. EIM supports users to quickly organize all kinds of data online and one-stop, and build BIM+GIS basic applications.
Software details: EIM Digital Twin Software | BIM+GIS lightweight engine
If you are interested in the EIM lightweight display engine and want to purchase, please follow the WeChat public account of "Ai 3D Technology" to contact us.