# CartographicPolygon: Clipping not precise **URL:** \ **Category:** Cesium for Unreal\ **Created:** [June 21, 2024, 10:11am UTC](https://community.cesium.com/t/cartographicpolygon-clipping-not-precise/33227 "2024-06-21T10:11:07Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![Kevin\_Ring](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/kevin_ring/32/2003_2.png) [@Kevin\_Ring](https://community.cesium.com/u/Kevin_Ring)\ **Post date:** [June 24, 2024, 12:58am UTC](https://community.cesium.com/t/cartographicpolygon-clipping-not-precise/33227/2 "2024-06-24T00:58:53Z")
We’ve heard a few reports of this recently. We don’t know the cause, but will be investigating soon. Sorry for the inconvenience! A possible workaround is to temporarily downgrade to Cesium for Unreal v2.4.0. Instructions for installing previous releases are here: > **[GitHub - CesiumGS/cesium-unreal: Bringing the 3D geospatial ecosystem to...](https://github.com/CesiumGS/cesium-unreal?tab=readme-ov-file#package-installing-cesium-for-unreal)** > > Bringing the 3D geospatial ecosystem to Unreal Engine - CesiumGS/cesium-unreal Previous community forum threads about this problem: > [@Shadows from geometry hidden by CesiumCartographicPolygon effecting our own meshes](https://community.cesium.com/t/shadows-from-geometry-hidden-by-cesiumcartographicpolygon-effecting-our-own-meshes/33039): > > Hi! I am working on a scene for a client and are using Cesium for the surrounding area of a architectural model in Unreal. Our goal is to integrate our own model into Cesium, we are using the CesiumCartographicPolygon component to hide/cut out part of the mesh overlaying our own model. But as evident from the images attached, a smearing shadow is cast on our own mesh from Cesium, this goes away as soon as we hide the Cesium tiles. Part of the Cesium mesh is also suddenly coming into view even … > [@Geographic Polygon Collision Clipping works in 5.1 but not in 5.4](https://community.cesium.com/t/geographic-polygon-collision-clipping-works-in-5-1-but-not-in-5-4/32661/7): > > We now have tested all matching Cesium versions (2.4.0, 2.4.1, 2.5.0, 2.6.0) for UE5.1 and 5.2 and came to a conclusion. This might be help for the cesium team: Cartographic Polygons in Cesium 2.4.0 definitively cuts geometry (or at least the collision), even if it is not intended as you said:) Testet both, in UE5.1 and 5.2 C.P. in Cesium 2.4.1 and all later versions does not cut. Also it does not set the Opacity mask 100% correctly. If the user walks nearby the cutted parts, these partly ap… --- _[View the full topic](https://community.cesium.com/t/cartographicpolygon-clipping-not-precise/33227)._