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<p>Hi,</p>
<p>Yes - exporting the raster to xyz points or to contour lines are both workarounds.</p>
<p>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 ( <a href="https://saga-gis.sourceforge.io/saga_tool_doc/8.5.1/tin_tools_0.html">https://saga-gis.sourceforge.io/saga_tool_doc/8.5.1/tin_tools_0.html</a> ) - 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?</p>
<p>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.</p>
<p>Andreas</p>
<p id="reply-intro">On 2023-03-20 14:20, Stefan Giese (WhereGroup) via QGIS-Developer wrote:</p>
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<p>Hi all,</p>
<p>I think it is not nessasary to go through Blender, just use theese two algorithm:</p>
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<li>pixeltopoints</li>
<li>tinmeshcreation</li>
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<p>Best regards</p>
<p>Stefan</p>
<div class="v1moz-cite-prefix">Am 20.03.2023 um 14:11 schrieb Sebastian Gutwein via QGIS-Developer:</div>
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<div dir="ltr">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.
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<div class="v1gmail_attr" dir="ltr">On Mon, Mar 20, 2023 at 9:03 AM Saber Razmjooei via QGIS-Developer <<a class="v1moz-txt-link-freetext" href="mailto:qgis-developer@lists.osgeo.org" rel="noreferrer">qgis-developer@lists.osgeo.org</a>> wrote:</div>
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<div dir="ltr">Hi Andreas,
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<div>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.</div>
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<div>Kind regards</div>
<div>Saber</div>
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<div class="v1gmail_attr" dir="ltr">On Mon, 20 Mar 2023 at 13:56, Andreas Neumann via QGIS-Developer <<a class="v1moz-txt-link-freetext" href="mailto:qgis-developer@lists.osgeo.org" rel="noreferrer">qgis-developer@lists.osgeo.org</a>> wrote:</div>
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<p>Hi QGIS devs,</p>
<p>Is there a tool available to create a Mesh (or TIN as a special mesh variation) from a source raster layer containing terrain values?</p>
<p>I did not find one - but maybe I didn't look everywhere.</p>
<p>If not in QGIS - do you know an external Open Source tool that could do that, while keeping real world coordinates?</p>
<p>Thanks,</p>
<p>Andreas</p>
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<div dir="ltr">Saber Razmjooei</div>
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<div dir="ltr">___________________________<br />
<div dir="ltr"><span>Sebastian "Bas* " Gutwein</span></div>
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