[QGIS-Developer] Tool to create Mesh from raster layer?

[Andreas Neumann]

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 at 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 at 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 at 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 [1]
> +44 (0)7568 129733 _______________________________________________
> QGIS-Developer mailing list
> QGIS-Developer at 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 [3]
(631) 241-1018

_Look close, think big, make change. _

_______________________________________________
QGIS-Developer mailing list
QGIS-Developer at 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 Berlin
https://fossgis-konferenz.de/2023/

WhereGroup-Beiträge auf der FOSSGIS
https://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.giese at wheregroup.com
www.wheregroup.com [2]
Geschäftsführer:
Olaf Knopp, Peter Stamm
Amtsgericht Bonn, HRB 9885

_______________________________________________
QGIS-Developer mailing list
QGIS-Developer at lists.osgeo.org
List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer



Links:
------
[1] http://www.lutraconsulting.co.uk
[2] http://www.wheregroup.com
[3] http://regenerativedesigngroup.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-developer/attachments/20230320/1f412589/attachment.htm>