Import terrain into QGIS that is in AutoCAD 3d faces ( dxf format).

[BenW]

Hello All,

I'm using QGIS 3.32.2 - Lima. I don't have a great deal of experience with QGIS which should be obvious by the following question.

I have a file containing a triangular ground surface in AutoCAD 3d faces (in dxf format). Which I can successfully import by drag and drop into qgis. When i place my cursor over some triangles  the cursor info pop says "Mesh Group" and opening the properties on the layer tells me the Geometry is - Polygon (Polygon Z).  I notice when I move my cursor over the surface the "value tool" does not show any heights. But when enquire on a triangle the correct z value is shown on one of the triangle vertex. So I'm happy the dxf imported correctly. 

My problem is I cannot work out how to convert this to a QGIS terrain either in mesh or raster format? So I can then export out to other formats.

My end goal is to just export a DEM in geotif (.tif) format.  So far i have spent 7 hours going down dead end after dead end on what I thought would be a 10 minute job!!

If anyone could help that would be much appreciated.

Regards

Ben

[box...@iinet.net.au]

Hi Ben,

 

Try importing the dxf file using “Another DXF importer” plug-in. This will give you more options and should bring in the file into correct location in xyz. Once in to QGIS you should be able to save as a geotiff or ers grid file.

 

Cheers Grant

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[BenW]

Hi Grant 

Thanks very much for your reply. I had also tried “another dxf importer” unfortunately without success. 

As mentioned the dxf imports. But when I inquire on the 3d face vertices they are only x,y with an attribute showing what the z value should be. Not x,y,z

I’m currently trying to work out how to copy the attribute value to the z value. Unfortunately no success at this stage.

If you or anyone else has any other suggestions that would be great.

When I get back to my computer I will cut out a section of the dxf to reduce the file size and post, so hopefully someone could have a look and tell me what I’m doing wrong.

Thanks again 

[box...@iinet.net.au]

Hi Ben,

 

Have you tried using the “Vector Geometry” > “Set Z Value” from the Processing Toolbox?

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