[QGIS-Developer] Point cloud renderer: tile borders visible?

[Martin Dobias]

Hi Andreas

I have seen this and looked into that some time ago. If I remember
correctly, sometimes the indexing algorithm when constructing the octree
decides to merge the more detailed "bucket" of points into the parent
"bucket" (that has bigger spacing), resulting in this kind of artifacts
where some buckets have higher resolution than expected. It happens when
the amount of points in the more detailed bucket would be too low, it's not
a bug :-) You should be able to avoid that if you lower the Maximum error
in the 2D renderer - by default this is 0.3mm, which should cause dense 2D
rendering of points until you reach the scale when the individual points
can be seen...

Regards
Martin


On Wed, May 11, 2022 at 9:34 AM Andreas Neumann via QGIS-Developer <
qgis-developer at lists.osgeo.org> wrote:

> Hi,
>
> When testing the 2D point cloud renderer I noticed that in certain scales
> / zoom levels one can clearly see point cloud tile borders:
>
> see screenshot at
> https://www.carto.net/neumann/temp/point_cloud_artefacts.png
>
> There seem to be different densities involved in certain regions here, but
> clearly they correspond to tile borders.
>
> Is this an expected artefact? Can this be avoided?
>
> When I zoom in or out, these artefacts seem to disappear.
>
> Thanks and greetings,
>
> Andreas
>
>
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