Geoserver: 20.20.1
Ubuntu: 11.0.13 (OpenJDK 64-Bit Server VM)
Database:  PostgreSQL 12.7 on x86_64-pc-linux-gnu

URLs used in test (tried multiple WFS version numbers as this seemed to fix
a issue with QGIS not importing Z value from geoserver WFS):

https://10.220.187.164/geoserver/mmodel/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=mmodel%3Ams_zones_clb&outputFormat=DXF

https://10.220.187.164/geoserver/mmodel/ows?service=WFS&version=1.1.0&request=GetFeature&typeName=mmodel%3Ams_zones_clb&outputFormat=DXF


Issue:
When exporting a DXF using one of the URLs, the resulting DXF does not
include a Z value (code 30 in DXF).  If I export the same polygons as a
SHAPEFILE or GeoJSON, the Z value is included.  The polygons are stored in
PostGIS and POLYGON Z

snippet from resulting DXF:
MS_ZONES_CLB
100
AcDbPolyline
 90
    10
 43
0.0
 10
747693.95
 20
7529014.65
 10
747716.17
 20
7529014.71
 10
747718.44
 20
7529011.17
 10
747718.11
 20
7529005.41
.
.
.

My amateurish (I am not a developer) search of the extension code (lines
390-398 of AbstractDXFWriter.java)  suggests that outputting Z is possible
and I cannot find any discussion on the topic in this mailing list or more
generally when searching google.  Does anybody know if it is possible to
export a DXF with Z or have any advice on how to achieve this?


Thanks,
Rex
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