Hi,
For what I have tried with your data, the Z coordinates have a really
high value (around 2999675) (is it not a bit strange for arqueological
excavation data?) and it seems QGIS does not like these high values (and
it may need a fix).
So I have tried by decreasing 2990000 on all Z data and it works fine!
Regards.
Le 19/03/2025 à 11:29, Gerald Kogler via QGIS-User a écrit :
Hi ppl,
Still no success with that :(
Anybody could share me a simple MultiPolygonZ object for QGIS which
does work in 3d Map View configuring the Single Symbol in 3D View
Properties? Just to make sure that it's not the installation or
configuration of my QGIS.
Thanks
Gerald
On 14/3/25 19:57, Gerald Kogler via QGIS-User wrote:
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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