[Qgis-user] MVP solid 3d

[Gerald Kogler]

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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