# PolygonOverlay: Fragments of geometry still visible

**URL:** https://community.cesium.com/t/polygonoverlay-fragments-of-geometry-still-visible/33229
**Category:** Cesium for Unreal
**Created:** [June 21, 2024, 10:12am UTC](https://community.cesium.com/t/polygonoverlay-fragments-of-geometry-still-visible/33229 "2024-06-21T10:12:28Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![Cascho75](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/cascho75/32/14037_2.png) [@Cascho75](https://community.cesium.com/u/Cascho75)
#### Post date: [June 21, 2024, 10:12am UTC](https://community.cesium.com/t/polygonoverlay-fragments-of-geometry-still-visible/33229/1 "2024-06-21T10:12:28Z")

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Hi,

I am using poylgon raster overlay to mask out a certain area of a city.  
But still there are fragments of geometry popping in / out , varying on distance of camera:

 ![image](https://global.discourse-cdn.com/cesium/original/3X/9/8/98be7aa8a36ac5a7fd5e3f01b8c3b09a53e9ed98.jpeg)

Any idea?

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### Author: ![Marco13](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/marco13/32/2757_2.png) [@Marco13](https://community.cesium.com/u/Marco13)
#### Post date: [June 21, 2024, 10:13am UTC](https://community.cesium.com/t/polygonoverlay-fragments-of-geometry-still-visible/33229/2 "2024-06-21T10:13:55Z")

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I assume that this is the same as [CartographicPolygon: Clipping not precise](https://community.cesium.com/t/cartographicpolygon-clipping-not-precise/33227) , so the discussion should probably happen there. (Drop me a note if this is not the same issue)

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<div class="post-metadata">

### Author: ![Marco13](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/marco13/32/2757_2.png) [@Marco13](https://community.cesium.com/u/Marco13)
#### Post date: [June 21, 2024, 10:14am UTC](https://community.cesium.com/t/polygonoverlay-fragments-of-geometry-still-visible/33229/3 "2024-06-21T10:14:01Z")

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