Hi Saber, It is a good point - to use the source.
I think the source was a point cloud data set. So, ideally, it could be a point cloud to mesh tool (or TIN). I see that Alex Bruy just committed a point cloud to raster tool (going through TIN is an option), but not as a final TIN result. Andreas On Tue, 21 Mar 2023 at 08:42, Saber Razmjooei via QGIS-Developer < qgis-developer@lists.osgeo.org> wrote: > Hi Andreas, > > Indeed, there is no native tool at the moment to convert raster directly > to mesh. I filed a ticket with a link to this discussion so we can add it > to QGIS later: > https://github.com/qgis/QGIS/issues/52313 > > But, in general, I would first try to find the source of the DEM raster > (e.g. point cloud or spot survey) and use the raw data to create the mesh. > This will avoid double interpolation :) > > Kind regards > Saber > > > On Mon, 20 Mar 2023 at 14:31, Andreas Neumann via QGIS-Developer < > qgis-developer@lists.osgeo.org> wrote: > >> and there seems to be https://github.com/heremaps/tin-terrain >> >> However, I am looking for a solution integrated in QGIS ... >> >> On 2023-03-20 14:28, Andreas Neumann via QGIS-Developer wrote: >> >> Hi, >> >> Yes - exporting the raster to xyz points or to contour lines are both >> workarounds. >> >> It would be nice, if QGIS would gain a direct algorithm of creating a >> mesh from a DEM - as many DTMs are provided as raster. It seems like SAGA >> has a raster DTM to TIN algorithm ( >> https://saga-gis.sourceforge.io/saga_tool_doc/8.5.1/tin_tools_0.html ) - >> but SAGA is a bit complicated to use within QGIS and SAGA support within >> QGIS processing may disappear in the future. Perhaps we could port the SAGA >> algorithm to QGIS - or maybe an alternative algorithm? >> >> My goal is to replace the raster DTM with a MESH for 3D display - with >> the ability to edit the MESH at important points. The builtin triangulation >> of the QGIS 3D viewer (where you can have a raster DTM as a terrain source) >> is sometimes doing weird things - I'd like to control that better - e.g. by >> introducing additional break lines or manually editing the Mesh. >> >> Andreas >> >> On 2023-03-20 14:20, Stefan Giese (WhereGroup) via QGIS-Developer wrote: >> >> Hi all, >> >> I think it is not nessasary to go through Blender, just use theese two >> algorithm: >> >> - pixeltopoints >> - tinmeshcreation >> >> Best regards >> >> Stefan >> Am 20.03.2023 um 14:11 schrieb Sebastian Gutwein via QGIS-Developer: >> >> The ridiculous work around I use is to go through Blender using the >> BlenderGIS plugin. Import the raster into Blender as a new mesh > Decimate >> the mesh > Export as a shapefile > Run TIN Mesh Creation in QGIS. >> >> >> On Mon, Mar 20, 2023 at 9:03 AM Saber Razmjooei via QGIS-Developer < >> qgis-developer@lists.osgeo.org> wrote: >> >> Hi Andreas, >> >> There should be a tool to convert vector to mesh (under Processing > Mesh >> > TIN Mesh Creation). There will also be some new Processing tools for >> handling point clouds. But I am not aware of any Raster > Mesh tools. >> >> Kind regards >> Saber >> >> On Mon, 20 Mar 2023 at 13:56, Andreas Neumann via QGIS-Developer < >> qgis-developer@lists.osgeo.org> wrote: >> >> Hi QGIS devs, >> >> Is there a tool available to create a Mesh (or TIN as a special mesh >> variation) from a source raster layer containing terrain values? >> >> I did not find one - but maybe I didn't look everywhere. >> >> If not in QGIS - do you know an external Open Source tool that could do >> that, while keeping real world coordinates? >> >> Thanks, >> >> Andreas >> _______________________________________________ >> QGIS-Developer mailing list >> QGIS-Developer@lists.osgeo.org >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer >> >> >> >> -- >> Saber Razmjooei >> www.lutraconsulting.co.uk >> +44 (0)7568 129733 >> _______________________________________________ >> QGIS-Developer mailing list >> QGIS-Developer@lists.osgeo.org >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer >> >> >> >> -- >> ___________________________ >> Sebastian "Bas* " Gutwein >> *rhymes with Josh >> >> Regenerative Design Group >> 1 Chevalier Ave >> Greenfield, Ma 01301 >> Web: regenerativedesigngroup.com >> (631) 241-1018 >> >> *Look close, think big, make change. * >> >> >> _______________________________________________ >> QGIS-Developer mailing listqgis-develo...@lists.osgeo.org >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer >> >> -- >> Mit freundlichen Grüßen >> Stefan Giese >> Projektleiter/Consultant >> ********************************************** >> FOSSGIS Konferenz >> 15.-18. März 2023 in Berlinhttps://fossgis-konferenz.de/2023/ >> >> WhereGroup-Beiträge auf der >> FOSSGIShttps://wheregroup.com/unternehmen/aktuelles/ >> ********************************************** >> WhereGroup GmbH >> Schwimmbadstr. 2 >> 79100 Freiburg >> Germany >> >> Tel.: +49 (0)761 / 519 102 - 61 >> Fax: +49 (0)761 / 519 102 - 11 >> stefan.gi...@wheregroup.comwww.wheregroup.com >> Geschäftsführer: >> Olaf Knopp, Peter Stamm >> Amtsgericht Bonn, HRB 9885 >> >> >> _______________________________________________ >> QGIS-Developer mailing list >> QGIS-Developer@lists.osgeo.org >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer >> >> >> >> _______________________________________________ >> QGIS-Developer mailing list >> QGIS-Developer@lists.osgeo.org >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer >> >> >> _______________________________________________ >> QGIS-Developer mailing list >> QGIS-Developer@lists.osgeo.org >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer >> > > > -- > Saber Razmjooei > www.lutraconsulting.co.uk > +44 (0)7568 129733 > _______________________________________________ > QGIS-Developer mailing list > QGIS-Developer@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer > -- -- Andreas Neumann QGIS.ORG board member (treasurer)
_______________________________________________ QGIS-Developer mailing list QGIS-Developer@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
