Hi,
Thanks for your answers and the hint with flat Z coordinate. Now I
managed to have MultiPolygonZ geometries with the complete 3d object
saved as feature.
Here a sample layer as gpkg file [1] containing 64 objects from an
arqueological excavation.
Objects do show up as plains in 3d Map View (QGIS 3.34), when I apply a
Single Symbol in 3D View Properties, they do disappear so.
Thanks for your help
Gerald
[1] https://cloud.servus.at/s/Gigik6fAYZKGjib
On 14/3/25 9:17, Johannes Kröger (WhereGroup) via QGIS-User wrote:
Hi Gerald,
a PolygonZ is not a solid but a surface* that might be rotated in 3D space.
Your PolygonZ has the same Z coordinate for all its points so it is
flat/orthogonal in reference to the vertical axis.
*: Depending on the Z coordinates a PolygonZ might not be a flat
(potentially rotated) surface but a rather complex surface. E.g. if you
have a polygon with 4 corners of which three have the same Z coordinate
but one has a different one: There is no flat surface connecting all
those points. I don't know the correct term for this right now.
Geometries like that are usually problematic. But https://
gis.stackexchange.com/a/350117/51035 shows an example with such geometry
being rendered "fine" in the QGIS 3D view.
Cheers, Hannes
On 3/13/25 19:39, Gerald Kogler via QGIS-User wrote:
Hi!
I'm trying without success to visualize a simple solid 3d object with
QGIS 3d Map View. The geometry is of type PolygonZ, but the 3d viewer
only shows it in 2 dimensions without Z values. All triangles are
shown on a plain.
The layer definitly does have Z values, using for example
geom_to_wkt($geometry) does show me WKT values like:
PolygonZ ((204594.00012206999235786 496779.0001220700214617 2998679.5,
204771.00012206999235786 496783.0001220700214617 2998679.5,
204881.00012206999235786 496802.0001220700214617 2998679.5,
204594.00012206999235786 496779.0001220700214617 2998679.5))
What do I miss, anything in the configuration which could be wrong? I
only manage to show the third dimension using extruding, that works
fine for example to show buildings from OpenStreetMaps.
Anybody knows about a dummy Getting Started tutorial beside the
official QGIS docs about 3d Map View in order to make a really basic
example work?
Thanks for your help
Gerald
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