# Rifts and undulations in the ground when using multi layers

**URL:** <https://community.cesium.com/t/rifts-and-undulations-in-the-ground-when-using-multi-layers/19032>\
**Category:** CesiumJS\
**Created:** [June 12, 2022, 8:36am UTC](https://community.cesium.com/t/rifts-and-undulations-in-the-ground-when-using-multi-layers/19032 "2022-06-12T08:36:39Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![ma\_se](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/ma_se/32/7100_2.png) [@ma\_se](https://community.cesium.com/u/ma_se)\
**Post date:** [June 12, 2022, 8:36am UTC](https://community.cesium.com/t/rifts-and-undulations-in-the-ground-when-using-multi-layers/19032/1 "2022-06-12T08:36:39Z")

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I used terrain with one image layer and it was perfect but since i am using multi image layers , the terrain has rift and undulations . what is the problem?

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**Author:** ![Jacky](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/jacky/32/7686_2.png) [@Jacky](https://community.cesium.com/u/Jacky)\
**Post date:** [June 12, 2022, 9:51am UTC](https://community.cesium.com/t/rifts-and-undulations-in-the-ground-when-using-multi-layers/19032/2 "2022-06-12T09:51:24Z")

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Hi @ma_se , You can please explain your issue with more detailed information with the help of a sandcastle example or screenshot? It will be helpful for us to understand the issue.

- Regards

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<div class="post-metadata">

**Author:** ![ma\_se](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/ma_se/32/7100_2.png) [@ma\_se](https://community.cesium.com/u/ma_se)\
**Post date:** [June 12, 2022, 10:03am UTC](https://community.cesium.com/t/rifts-and-undulations-in-the-ground-when-using-multi-layers/19032/3 "2022-06-12T10:03:09Z")

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this is what i see

 ![Screenshot from 2022-06-12 14-30-12](https://global.discourse-cdn.com/cesium/original/2X/d/dd992891f6f92ab412243d40e16a672d8d32e44e.jpeg)

this is important part of code :

```auto
  let terrainProvider = new Cesium.CesiumTerrainProvider({
    url: `${process.env.REACT_APP_TERRAIN_PROVIDER_URL}`,
    requestVertexNormals: true,
  });

```

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<div class="post-metadata">

**Author:** ![Jacky](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/jacky/32/7686_2.png) [@Jacky](https://community.cesium.com/u/Jacky)\
**Post date:** [June 12, 2022, 10:55pm UTC](https://community.cesium.com/t/rifts-and-undulations-in-the-ground-when-using-multi-layers/19032/4 "2022-06-12T22:55:57Z")

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I can’t see the attached screenshot. Please re-upload it with detailed information.

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<div class="post-metadata">

**Author:** ![ma\_se](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/ma_se/32/7100_2.png) [@ma\_se](https://community.cesium.com/u/ma_se)\
**Post date:** [June 13, 2022, 3:06am UTC](https://community.cesium.com/t/rifts-and-undulations-in-the-ground-when-using-multi-layers/19032/5 "2022-06-13T03:06:59Z")

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I just edited my post

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<div class="post-metadata">

**Author:** ![Jacky](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/jacky/32/7686_2.png) [@Jacky](https://community.cesium.com/u/Jacky)\
**Post date:** [June 13, 2022, 3:30am UTC](https://community.cesium.com/t/rifts-and-undulations-in-the-ground-when-using-multi-layers/19032/6 "2022-06-13T03:30:17Z")

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Can you please the URL of Terrain Provider here to test?

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<div class="post-metadata">

**Author:** ![ma\_se](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/ma_se/32/7100_2.png) [@ma\_se](https://community.cesium.com/u/ma_se)\
**Post date:** [June 13, 2022, 6:31am UTC](https://community.cesium.com/t/rifts-and-undulations-in-the-ground-when-using-multi-layers/19032/7 "2022-06-13T06:31:32Z")

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No it is custom terrain. Is it the problem with terrain?