.OBJ is a simple object mesh (or to put it in more traditional terms: TIN) - it has shape but no data values and is not geolocated.
I don't think there is any driver for OGR that will read .OBJ. You are going to problems with geolocation if you write your own. Geojson requires that the geometries are geolocated - and in the current version that they are in epsg:4326. That is not totally impossible - people have been using .dxf files for gis data for decades and that format is also not in theory geolocated. It is not a trivial problem though. I guess I would ask the usual question .. why? - what are you actually trying to achieve and why a GIS format like GeoJSON? - If you have to use GeoJSON - I am guessing you are transferring some data to something that reads GeoJSON only? In that case - can your source produce .dxf? OGR can read .dxf. - If you only have the source in .OBJ - what other formats can the destination read? Although, if you only have the source in .obj, I very much doubt any of the GIS tools like GDAL are going to be able to help you. It just is not a format used in GIS. It is a problem we solved in the ViRGiS projec <http://www.virgis.org>t - since .obj is used a lot in VR. There we used an existing library to read the .obj files - but that is in C# and I doubt that would help you. On Tue, 1 Dec 2020 at 20:15, Andrew C Aitchison <[email protected]> wrote: > On Tue, 1 Dec 2020, Brandon Biggs wrote: > > > Hello, > > I am wondering how to convert an obj file to a geojson file? I am using > ogr2ogr with the command: > > Ogr2ogr -f geojson output.geojson input.obj > > But get the error that ogr2ogr does not have an OBJ driver. I looked on: > > the vector drivers page<https://gdal.org/drivers/vector/index.html> > > but am unable to find a simple obj converter. I am wondering if there is > such a thing? I am probably going to write my own that does what I want, > because OBJ is so simple, I was just wondering if GDAL could already do it. > > I've never heard of OBJ, but that doesn't mean much. > > If you only want a read-only ogr driver you might want to look at > https://gdal.org/tutorials/vector_python_driver.html > if you would find a quick-n-dirty python quicker to write than C++. > > -- > Andrew C. Aitchison Kendal, UK > [email protected] > _______________________________________________ > gdal-dev mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/gdal-dev >
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