Introduction to mago3D: A web based GeoBIM platform on top of FOSS4G
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mago3D is a web-based GeoBIM platform that allows for visualization of massive 3D objects like BIM models directly in web browsers. It integrates BIM and 3D GIS data in a single space through key algorithms that reduce data size and optimize rendering speed. These include a model-reference system, level-of-detail mesh generation, and culling techniques using visibility and spatial indexes. The open source platform supports standard formats and provides APIs for developing applications involving tasks like 3D navigation, attribute viewing, and issue monitoring.
Introduction to mago3D: A web based GeoBIM platform on top of FOSS4G
- 1. Introduction to mago3D: A web based GeoBIM platform on top of FOSS4G Sanghee Shin([email protected]) Hakjoon Kim([email protected])
- 2. 2 GeoBIM
- 5. 5 From Open Sourceโฆ mago3D
- 6. 6 Introduction โ mago3D mago3D is a platform for โฆ Visualizing massive and complex 3D objects including BIM on a web browser 1 Seamless integration of BIM/AEC and 3D GIS in a single space2 Web based collaborative issue/process management4 โDigital Twinโ that can create parallel worlds in a virtual reality with numerous IoT, sensor data 3 = GIS + BIM + Open Source
- 7. 7 Introduction โ Architecture of mago3D mago3D.JS Cesium/WWW Client internet Web Server WAS F4DStorage mago Content Management DataBase F4D Converter 2 main cores of mago3D
- 8. 8 Introduction โ Overall System Components DB Postgresql 9.6 + PostGIS Web Server Nginx 1.12.1 / Apache 2.4 Language Java8 Framework Spring(Springboot) + Mybatis Build Gradle Log Logback/Log4j 2 Security ESAPI Report Jasper/POI View JSP/JSTL UI/UX Jquery Chart Jqplot/Axisj Template Thymeleaf Handlebars Web Map Server GeoServer OS Centos 7.2 3D Viewer Cesium, WorldWind Cache EhCache, Redis Container Docker WAS Tomcat 8.5
- 9. 9 Introduction โ Core parts of mago3D F4D Converter mago3D.js mago3D.js 3D GIS Engines Cesium Web World Wind API API service html F4D Converter converts 3D formats(IFC, 3DS, OBJ, DAE, JT) to 3D internet service format F4D. It carries out data size reducing and pre-processing for fast rendering A plug-in composed of pure javascript which enables 3D GIS engines to handle large-sized and highly detailed AEC data F4D Converter F4D .ifc .3ds .obj .dae
- 10. Key Algorithms GeoBIM is too heavy due to so many vertices and triangles in so many objects. This causes two major issues in handling GeoBIM in web browsers. ! Network Traffic Rendering Speed
- 11. Key Algorithms So we introduced 2 concepts to solve these issues. reducing size preprocessing for speed building rougher LOD making indices used in culling removing duplication
- 12. Key Algorithms step what is this? used for Model/Reference A concept of writing 3D data that only one geometry among multiple geometries congruent with each other is written. reducing data size of semantic data(ex. BIM/CAD, 3D data by modeling) NSM(Net Surface Mesh) This is composed of 2 steps. 1. building meshes with regularly gridded vertices on surfaces of raw 3D model. 2. triangle reduction. making rougher LOD โป 2nd step is separately applied in simplifying targets in case of triangular meshes such like TIN or random-shaped 3D data Visibility/Spatial index Visibility index is for occlusion culling and spatial index is for frustum culling in indoor camera working. carrying out a serial combination of 2 cullings for fast determination of targets to be shown Letโs look into more concretely.
- 13. Key Algorithms : F4D, lightweight service format ๏จ Model is 3D geometry info, while Reference is real instance of this model 10
- 14. with 4 geometric meshes - 4 models 23 objects are created. - 23 references Image source : www.vecteezy.com Key Algorithms : F4D, lightweight service format Example of Model-Reference 11
- 15. 12 1. Build a triangular mesh based on the grid structure from the original three-dimensional data. Key Algorithms : F4D, lightweight service format
- 16. 12 1. Build a triangular mesh based on the grid structure from the original three-dimensional data. Key Algorithms : F4D, lightweight service format
- 17. 13 2. Triangle reduction (edge collapse) Inner edge collapse frontier edge collapse Key Algorithms : F4D, lightweight service format
- 18. 13 2. Triangle reduction (edge collapse) Key Algorithms : F4D, lightweight service format
- 19. 14 Key Algorithms : F4D, lightweight service format
- 20. These are made from original data by adjusting details. 15 LOD 0 (Original data) LOD 2 LOD 3 LOD 4 LOD 5 Key Algorithms : F4D, lightweight service format
- 21. Key Algorithms : Culling for performance enhancement Do not render things not necessarily to be shown. before rotating a camera around a target during rotating after rotating Do not render if not necessary. 16
- 22. Visibility Index An index describing which inner objects can be seen from selected positions in AEC. This index is used in occlusion culling in run-time visualization of mago3D. 17 Key Algorithms : F4D, lightweight service format
- 23. Spatial Index An index describing which inner objects are in cubes, spatial sub-divisions of AEC. This index is used in frustum culling in run-time visualization of mago3D. 18 Key Algorithms : F4D, lightweight service format
- 24. 1. When a camera position and 2. the viewing direction of it are setup, 3. mago3D does frustum culling on spatial indices 4. and do occlusion culling on the result of the frustum culling. 5. Finally mago3d finds targets to be rendered. (intersection between two indices) โ It possible to select targets to be rendered without any complicated geometric operation in run-time. How to use both indices 19 Key Algorithms : F4D, lightweight service format
- 25. 3D Tiles and F4D โป image source https://cesium.com/blog/2015/08/10/introducing-3d-tiles/ www.zionfriedheim.org zoomed in ใ3D Tilesใ is an aggregation of various 3D data invented for better request/response in web service and applying LOD in rendering. 3D Tiles F4D is, conceptually, exactly matched to a component in a ใ3D Tilesใ dataset.
- 26. 3D Tiles and F4D Why new format was devised instead of 3D Tiles? - GeoBIM data is too heavy to be handled as a 3D Tiles component in Cesium. - So more processes are necessary to handle GeoBIM well such like โindoor/outdoor separationโ, โfrustum culling with occlusion cullingโ, and etc. - This means that we have to expand 3D Tiles to support โindoor or microscopic stuffโ and modify Cesium to support necessary processes. - But we have no idea about how to insert indoor things into 3D Tiles and structure of Cesium as a rendering engine is so rigid that we canโt modify it. So we introduced a new format and made a rendering pipeline for it separate with Cesium rendering loop.
- 27. 3D Tiles and F4D initialization target determination render/request targets rendering loop in Cesium trigger target determination indoor checking look up cache render/request
- 28. 20 mago3D runs on any device Accessible from any device, anytime, anywhere
- 29. Results: BIM(Indoor/Outdoor) Integration Seamless integration of indoor and outdoor space on the same platform Scene from indoor to outdoor through windows Scene from outdoor to indoor through windows 21
- 30. Results: MEP Integration 22 Integration of large size MEP and 3D GIS on a web browser
- 31. Results: AEC Integration 23 Integration of large size AEC and 3D GIS on a web browser
- 32. Results: Various API supported (OpenAPIs) APIs are supported for developing application systems(currently 29 APIs) moving/rotating a full building moving objects & viewing attributes registration/monitoring/search of issues 24
- 33. Results: Cultural Heritage in Korea โข Cultural asset in Korea 25
- 34. Results: Tunnel, Bridge in Japen โข Tunnel, Department store, Bridge, Overpass offered by CUG (Civil User Group in Japan) 26
- 35. In future 30 A mago3D Cloud B mago3D B mago3D Point Clouds Realistic Mesh IFC Volumetric Data 3DS Revit To the Digital Twin Platform
- 36. Demo
- 37. Summary Key Features โข BIM/AEC and 3D GIS integration in a single space โข Web based โ no need to install additional program โข Massive and complex 3D objects rendering โข Open source โ Apache and AGPL license โข Supports industry standard formats(ifc, 3ds, dae, kml, gltfโฆ) โข In-Browser 3D objects moving/rotation/heading adjustment โข Highly extensible architecture 32
- 38. For more information, please visit http://mago3d.com All the source codes are here: https://github.com/Gaia3D/mago3d Thank you! 33 This project is funded by Ministry of Land, Infrastructure and Transport, Korea, through R&D project(number:18NSIP-B080778-05) Sanghee Shin [email protected]