Steps from DEM to quantized-mesh tiles

[turban]

Thanks for providing a quantized-mesh library! I've previously used simple hightmap for 3D landscape rendering in Cesium: http://blog.thematicmapping.org/2014/10/3d-terrains-with-cesium.html

Now I would like to use the 3d-forge library, but I miss some documentation covering all the steps.

If I have a GeoTIFF DEM, what are the actual steps to turn it into quantized-mesh tiles?

[loicgasser]

Hi,

Steps are

1. Create a mesh from your DEM
2. Create simplified meshes from your initial mesh

This is not covered in this project.

1. Load each mesh in a separated table in postgres (make sure you are in WGS84) and make sure DB credentials are ok in configs/terrain/database.cfg.mako
2. Define a configuration file for your tiling scheme configs/terrain/tms.cfg.mako, configure s3 bucket and so on.
3. Make sure you installed sql functions in your template.
4. Run lib/tiler.py > will write terrain tiles to S3

You can also have a look at
https://github.com/loicgasser/quantized-mesh-tile

Which takes care of the encoding/decoding part of a terrain tile. The goal is to use this module in the 3D forge. Also if you want to add doc/improve the code base, PR are welcome.

[turban]

Thanks, I'll try to get this pipeline to work, and maybe contribute to the documentation if I succeed ;-)

Although creating the mesh is not part of the project, it is still prerequisite as most terrain data is in raster format. Which tools did you use to create the (simplified) mesh for the Swiss Geoportal?

[gjn]

We used commercial software to create the triangulation/mesh.

[turban]

Ok, I'm currently trying to find an open source solution: http://blog.thematicmapping.org/2016/09/creating-tin-from-raster-dem.html

[loicgasser]

Thanks for the link. Let us know how it went

[543802360]

good job，thank you！ I will have a try