# Custom Cesium Cartographic Polygon from Spline?

**URL:** <https://community.cesium.com/t/custom-cesium-cartographic-polygon-from-spline/28734>\
**Category:** Cesium for Unreal\
**Created:** [December 14, 2023, 10:32pm UTC](https://community.cesium.com/t/custom-cesium-cartographic-polygon-from-spline/28734 "2023-12-14T22:32:51Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![pbrgle1](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/pbrgle1/32/14037_2.png) [@pbrgle1](https://community.cesium.com/u/pbrgle1)\
**Post date:** [December 14, 2023, 10:32pm UTC](https://community.cesium.com/t/custom-cesium-cartographic-polygon-from-spline/28734/1 "2023-12-14T22:32:51Z")

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Hello. I have a spline in my editor which I imported for Blender and would like to use it for clipping. Is this something that can be done? I haven’t been able to figure it out yet and I’m wondering if it’s even possible?

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**Author:** ![jdh2550](https://avatars.discourse-cdn.com/v4/letter/j/e19adc/32.png) [@jdh2550](https://community.cesium.com/u/jdh2550)\
**Post date:** [December 17, 2023, 9:04pm UTC](https://community.cesium.com/t/custom-cesium-cartographic-polygon-from-spline/28734/2 "2023-12-17T21:04:11Z")

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Hi, I’ve done something similar… which is to read in a set of long/lat points and spawn a cesium cartographic polygon (CCP) and set its spline points.

 ![image](https://global.discourse-cdn.com/cesium/original/3X/f/2/f20d26e995d37f0ec26b4a03c14c55452957a23a.png)

You then add the CCP to the polygons member of the CesiumPolygonRasterOverlay (CPRO). The CPRO is a component of the Cesium3DTileSet:

 ![image](https://global.discourse-cdn.com/cesium/original/3X/c/0/c013b9f1ff91c56fafdd2a1b167b97a2bf0af77c.png)

Does that help?

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**Author:** ![digdogdigdog](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/digdogdigdog/32/14037_2.png) [@digdogdigdog](https://community.cesium.com/u/digdogdigdog)\
**Post date:** [August 29, 2024, 1:23am UTC](https://community.cesium.com/t/custom-cesium-cartographic-polygon-from-spline/28734/3 "2024-08-29T01:23:16Z")

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I second this. This would be an insane feature. Would really help with mass scale!!

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**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:** [August 30, 2024, 5:04am UTC](https://community.cesium.com/t/custom-cesium-cartographic-polygon-from-spline/28734/4 "2024-08-30T05:04:56Z")

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Hi @digdogdigdog, welcome to the community!

The post above explains how it can be done. Did that not work for you? Or is there something else you need that is missing?

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**Author:** ![Z\_Mar](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/z_mar/32/32701_2.png) [@Z\_Mar](https://community.cesium.com/u/Z_Mar)\
**Post date:** [January 9, 2026, 8:53pm UTC](https://community.cesium.com/t/custom-cesium-cartographic-polygon-from-spline/28734/5 "2026-01-09T20:53:06Z")

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**[jdh2550](https://community.cesium.com/u/jdh2550) - What software is that? Reminds me of Node red**