Discussion:
[Qgis-user] Elements appear and disappear while zomming and panning
G. Allegri
2018-11-30 11:08:04 UTC
Permalink
I'm facing a strange behaviour with a very simple layer: 5 polygons, 4
corners each.

The following video shows what happens while panning and zooming the map.
No reporjection applied and nothing changed on the rendering settings.



Can anybody spot what's wrong with this layer?
Giovanni
G. Allegri
2018-11-30 11:08:40 UTC
Permalink
I forgot to say it happens with QGIS 3.4 on Windows 10.
Post by G. Allegri
I'm facing a strange behaviour with a very simple layer: 5 polygons, 4
corners each.
The following video shows what happens while panning and zooming the map.
No reporjection applied and nothing changed on the rendering settings.
http://youtu.be/UOfwRlfcDK4
Can anybody spot what's wrong with this layer?
Giovanni
Luigi Pirelli
2018-11-30 11:29:22 UTC
Permalink
just an hint to check, in vector properties ->rendering try to unckeck (if
set) the vector simplification during render process. And if set, plays
with possible simplification parameters.
Luigi Pirelli

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Post by G. Allegri
I forgot to say it happens with QGIS 3.4 on Windows 10.
Post by G. Allegri
I'm facing a strange behaviour with a very simple layer: 5 polygons, 4
corners each.
The following video shows what happens while panning and zooming the map.
No reporjection applied and nothing changed on the rendering settings.
http://youtu.be/UOfwRlfcDK4
Can anybody spot what's wrong with this layer?
Giovanni
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G. Allegri
2018-11-30 11:59:30 UTC
Permalink
Thx Luigi, I already tried that, and other options combinations, but no one
solved the issue.
Post by Luigi Pirelli
just an hint to check, in vector properties ->rendering try to unckeck (if
set) the vector simplification during render process. And if set, plays
with possible simplification parameters.
Luigi Pirelli
**************************************************************************************************
* LinkedIn: https://www.linkedin.com/in/luigipirelli
* Stackexchange: http://gis.stackexchange.com/users/19667/luigi-pirelli
* GitHub: https://github.com/luipir
*
https://www.packtpub.com/big-data-and-business-intelligence/mastering-qgis-second-edition
* Hire me: http://goo.gl/BYRQKg
**************************************************************************************************
Post by G. Allegri
I forgot to say it happens with QGIS 3.4 on Windows 10.
Post by G. Allegri
I'm facing a strange behaviour with a very simple layer: 5 polygons, 4
corners each.
The following video shows what happens while panning and zooming the
map. No reporjection applied and nothing changed on the rendering settings.
http://youtu.be/UOfwRlfcDK4
Can anybody spot what's wrong with this layer?
Giovanni
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Qgis-user mailing list
List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
G. Allegri
2018-11-30 12:28:22 UTC
Permalink
The GeoJSON I was given didn't have the polygons correctly closed. First
vertex wasn't repeated.
Sorry and forget it...

Giovanni
Post by G. Allegri
Thx Luigi, I already tried that, and other options combinations, but no
one solved the issue.
Post by Luigi Pirelli
just an hint to check, in vector properties ->rendering try to unckeck
(if set) the vector simplification during render process. And if set, plays
with possible simplification parameters.
Luigi Pirelli
**************************************************************************************************
* LinkedIn: https://www.linkedin.com/in/luigipirelli
* Stackexchange: http://gis.stackexchange.com/users/19667/luigi-pirelli
* GitHub: https://github.com/luipir
*
https://www.packtpub.com/big-data-and-business-intelligence/mastering-qgis-second-edition
* Hire me: http://goo.gl/BYRQKg
**************************************************************************************************
Post by G. Allegri
I forgot to say it happens with QGIS 3.4 on Windows 10.
Post by G. Allegri
I'm facing a strange behaviour with a very simple layer: 5 polygons, 4
corners each.
The following video shows what happens while panning and zooming the
map. No reporjection applied and nothing changed on the rendering settings.
http://youtu.be/UOfwRlfcDK4
Can anybody spot what's wrong with this layer?
Giovanni
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Qgis-user mailing list
List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
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