VTK::IOCesium3DTiles#

vtk3DTilesWriter - Convert a multiblock dataset to the 3D Tiles format.#

Currently, to create a valid 3D Tiles dataset we may need additional conversions: from GLTF to GLB and from GLB to B3DM. We can use JavaScript tools to do these conversions.

Install conversion and validation scripts#

Using node and npm installed on Ubuntu 20.04:
cd ~/external/3d-tiles-tools/;npm install 3d-tiles-tools. Help at: https://github.com/AnalyticalGraphicsInc/3d-tiles-tools/tree/master/tools
cd ~/external/gltf-pipeline;npm install gltf-pipeline. Help at: https://github.com/CesiumGS/gltf-pipeline
Clone https://github.com/CesiumGS/3d-tiles-samples. and then npm install.
Clone https://github.com/KhronosGroup/glTF-Validator and then follow Building section.

Convert data to GLB or B3DM - Optional#

See Testing/Cxx/Test3DTilesWriter for conversions of Jacksonville data stored in OBJs and or Berlin data stored in CityGML. Note that the test saves the 3D Tiles data using GLTF files. If needed, you can use GLB or B3DM, but you’ll need to do the following conversions manually: cd ~/projects/VTK/build/Testing/Temporary/jacksonville-3dtiles/ cd ~/projects/VTK/build/Testing/Temporary/berlin-3dtiles/

Convert gltf to glb

find . -name '*.gltf' -exec bash -c 'nodejs ~/external/gltf-pipeline/bin/gltf-pipeline.js -i ${0} -o ${0%.*}.glb' {} \;
find . -name '*.gltf' -exec rm {} \;
find . -name '*.bin' -exec rm {} \;

Check glb validity

~/external/glTF-Validator/build/bin/gltf_validator Testing/Temporary/TestGLTFWriter.glb

Convert glb to b3dm

find . -name '*.glb' -exec bash -c 'nodejs ~/external/3d-tiles-tools/tools/bin/3d-tiles-tools.js glbToB3dm ${0} ${0%.*}.b3dm' {} \;
find . -name '*.glb' -exec rm {} \;

View in Cesium#

Use 3d-tiles-samples

Link the tileset created for previous set: cd ~/external/3d-tiles-samples/tilesets; ln -s ~/projects/VTK/build/Testing/Temporary/jacksonville-3dtiles cd ~/external/3d-tiles-samples/tilesets; ln -s ~/projects/VTK/build/Testing/Temporary/berlin-3dtiles
Start web server: cd ..;npm start

google-chrome jacksonville-3dtiles.html;google-chrome berlin-3dtiles.html

Test the tilesets using 3d-tiles-validator#

cd ~/external/3d-tiles-validator/validator/
node ./bin/3d-tiles-validator.js -i ~/projects/VTK/build/Testing/Temporary/jacksonville-3dtiles-points/tileset.json
node ./bin/3d-tiles-validator.js -i ~/projects/VTK/build/Testing/Temporary/jacksonville-3dtiles-colorpoints/tileset.json