Generation of simulation ready 3D models Tom Commandeur 3dgeoinfo pre-conference workshop 2018-09-30 

3DTOP10NL Open data 2013 1:10.000 topo map Supercomputer: 70.000h calculation time (8 years) Contains inconsistencies à Lessons learned 

TOP10NL 1:10.000 topo map Supercomputer: 8 years calculation time 

BGT ~1:500 topo map ~9x more 2D objects as TOP10NL Supercomputer: 80 years calculation time 

IMGeo 3D is optional 2D IMGeo LOD0 LOD1 3D LOD2 BGT BAG Tree Extrusion Extrusion 2.5D 

BGT input to 3dfier Requires preprocessing https://github.com/tudelft3d/3dfier/tree/master/resources/BGT_prepare 

3dfier An open-source software to reconstruct automatically 3D models 

Input: any 2D datasets (eg TOP10NL or BGT) 8 We assign each polygon to a class: 1. Building 2. Water 3. Road 4. Vegetation 5. Terrain 6. Separation 7. Bridge 

Assign each LiDAR point to polygons 9 

Assign each LiDAR point to polygons 10 

Lifting each polygon based on simple rules (eg avg) 11 gaps Terrain and vegetation classes have LiDAR points added Other classes only vertices are lifted 

Stitching adjacent polygons with pairwise rules 12 

Stitching adjacent polygons with pairwise rules 13 avg of both vertical surfaces added volume of buildings can be preserved 

Stitching adjacent polygons with pairwise rules 14 gaps 

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Opens the door to many simulations: 18 1. urban heat island 2. wind comfort for pedestrian at street level 3. wind loading on buildings 4. urban blast 5. crowd movement 6. urban flooding simulations 

3dfier on github 19 github.com/tudelft3d/3dfier 

3dfier wiki on github Usage of 3dfier https://github.com/tudelft3d/3dfier/wiki/General-3dfier-tutorial-to-generate-LOD1-models Extract data from OSM https://github.com/tudelft3d/3dfier/wiki/Extracting-building-footprints-from-OpenStreetMap Running the precompiled binary on Windows https://github.com/tudelft3d/3dfier/wiki/Running-the-precompiled-3dfier-binary-on- Windows-64-bit-7%2C-8-or-10 

3dfier download 3dfier Version 1.0.3 (Windows) 3dfier Version 0.9.7 (OSX) https://github.com/tudelft3d/3dfier/releases 

3dfier YAML configuration Input Buffers Input pts lifting 

3dfier is command line only 

Run example data From example_data folder run: ..\3dfier.exe testarea_config.yml --OBJ output\testarea.obj or ../3dfier.exe testarea_config.yml --OBJ output/testarea.obj 

thank you. [email protected] 3d.bk.tudelft.nl/hledoux Hugo Ledoux Tom Commandeur [email protected]