Problems with clamped polygons on mobile devices

CesiumJS
1

Hi, everyone. I’m facing a problem with clamped polygons on mobile devices. I’m using a Galaxy S20 Ultra for testing.

I created a sandcastle in the following link: Cesium Sandcastle

And a video with the results on my mobile: Cesium clamped polygon problems on mobile devices - YouTube

Any help or thoughts appreciated.

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2

Yes, apparently it is an issue that still cannot be overcome, there have been several posts related to low quality in mobiles when clamped polygons are drawn.
On the other hand I have noticed that using 3d-tiles with classification have a similar behavior.

I have tested your sandcastle, finding the same fault in:

  • Samsung S20 +
  • Huawei P20 Lite
  • Samsung Galaxy Tab

Some posts that could be related and that are closed:
https://github.com/CesiumGS/cesium/issues/7273
https://github.com/CesiumGS/cesium/issues/8953
https://github.com/CesiumGS/cesium/issues/6735

It may be necessary to open another issue.

On the other hand I could notice that when painting on Terrain it has the same behavior. In the following link from sandcastle you can see that when zoom-in near the polygon “Draw Polygon” option also has this erratic behavior

https://sandcastle.cesium.com/?src=Clamp%20to%20Terrain.html

Best
Moses

3

@tonycedeno It seems that a long time ago you had the same problem, since reviewing I see a similar post of yours.
https://community.cesium.com/t/errors-showing-kml-over-3d-tiles-mobile-view/10845

Interesting to see how Cesium ION improves visualization !!
I tested it on my Android Samsung S20+ and I can see how it fails in Sandcastle and fails less in Cesium ION, I would appreciate any tip to improve this in the community version of CesiumJS.
Can you please upload these assets to Cesium Ion and test it in another Sandcastle?

Best
Moses

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