# Polygon clamping goes very wrong

**URL:** <https://community.cesium.com/t/polygon-clamping-goes-very-wrong/19438>\
**Category:** CesiumJS\
**Created:** [July 6, 2022, 12:58pm UTC](https://community.cesium.com/t/polygon-clamping-goes-very-wrong/19438 "2022-07-06T12:58:10Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![kamiedge](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/kamiedge/32/5200_2.png) [@kamiedge](https://community.cesium.com/u/kamiedge)\
**Post date:** [July 6, 2022, 12:58pm UTC](https://community.cesium.com/t/polygon-clamping-goes-very-wrong/19438/1 "2022-07-06T12:58:10Z")

</div>

Hi everyone, i experience some strange problem with a set of polygon, they are not campled as they should be, some of them are hidden and the others create a strange bug where (i guess?) we see a transparent (elevated) copy of the polygon hiding some others, try to move the camera while looking at the polygon to experience it

My geojson seems to be valide ( i have tested it with [geojsonlint](https://geojsonlint.com/) )

Can anyone tell me what is it going on ?

[Sandcastle](https://sandcastle.cesium.com/#c=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)
