# 3DTilesTileset show’s the problem
**URL:** https://community.cesium.com/t/3dtilestileset-show-s-the-problem/23840
**Category:** Cesium for Unity
**Created:** [May 6, 2023, 9:58am UTC](https://community.cesium.com/t/3dtilestileset-show-s-the-problem/23840 "2023-05-06T09:58:51Z")
**Posts on this page:** 11
**Page:** 1
### Author:  [@chiqiangzhe](https://community.cesium.com/u/chiqiangzhe)
#### Post date: [May 6, 2023, 9:58am UTC](https://community.cesium.com/t/3dtilestileset-show-s-the-problem/23840/1 "2023-05-06T09:58:52Z")
A black edge appears in the middle or edge of each tile. It disappears when you get close to it, but it appears at a certain distance. This update only appears after 1.1.0
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### Author:  [@janine](https://community.cesium.com/u/janine)
#### Post date: [May 8, 2023, 1:36pm UTC](https://community.cesium.com/t/3dtilestileset-show-s-the-problem/23840/2 "2023-05-08T13:36:39Z")
I can’t tell off of the top of my head which of our changes could have caused the issue. Does your data contains the `KHR_materials_unlit` extension? If it does not, we changed how we automatically generate normals for meshes. Perhaps enabling “Generate Smooth Normals” on your tileset will make a difference.
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### Author:  [@Kevin\_Ring](https://community.cesium.com/u/Kevin_Ring)
#### Post date: [May 9, 2023, 12:25am UTC](https://community.cesium.com/t/3dtilestileset-show-s-the-problem/23840/3 "2023-05-09T00:25:57Z")
I’m not able to reproduce this. Are you seeing it in any of the Cesium for Unity Samples tilesets? Or just in your own?
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### Author:  [@chiqiangzhe](https://community.cesium.com/u/chiqiangzhe)
#### Post date: [May 9, 2023, 2:02am UTC](https://community.cesium.com/t/3dtilestileset-show-s-the-problem/23840/4 "2023-05-09T02:02:30Z")
@janine
I don’t quite understand，Where is the KHR materials unlit extension？
The default material I should use。
enabling “Generate Smooth Normals” did not improve the problem。
@Kevin_Ring
I used 02\_CesiumMelbourne and still found the problem
Is it the unity version? My version is 2021.3.7
Other than that(unrelated to this question),I used my own modified material in the problem before, and the detection Normals failed, but enabling "Generate Smooth Normals has solved the snow I made.
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### Author:  [@Kevin\_Ring](https://community.cesium.com/u/Kevin_Ring)
#### Post date: [May 9, 2023, 3:30am UTC](https://community.cesium.com/t/3dtilestileset-show-s-the-problem/23840/5 "2023-05-09T03:30:04Z")
I don’t see anything like that in Melbourne. Have you changed any project settings in Cesium for Unity Samples? What platform / OS and rendering engine are you using? Can you try the latest 2021.3 release of Unity, just to confirm your particular version isn’t somehow causing a problem?
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### Author:  [@chiqiangzhe](https://community.cesium.com/u/chiqiangzhe)
#### Post date: [May 29, 2023, 2:26am UTC](https://community.cesium.com/t/3dtilestileset-show-s-the-problem/23840/6 "2023-05-29T02:26:17Z")
Sorry for taking so long to reply. I created a new urp project and changed the unity version to 2021.3.23f1c1 (LTS). I only imported cesium. This problem still appeared in Melbourne Photogrammetry. It is also easier to observe when the camera lens is far away. I did not find similar problems in other cases, but I also found this problem in large flat areas in my tiles
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### Author:  [@Kevin\_Ring](https://community.cesium.com/u/Kevin_Ring)
#### Post date: [May 29, 2023, 11:20pm UTC](https://community.cesium.com/t/3dtilestileset-show-s-the-problem/23840/7 "2023-05-29T23:20:05Z")
Is this with the default material? Or are you still using your own custom one?
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### Author:  [@chiqiangzhe](https://community.cesium.com/u/chiqiangzhe)
#### Post date: [May 30, 2023, 1:34am UTC](https://community.cesium.com/t/3dtilestileset-show-s-the-problem/23840/8 "2023-05-30T01:34:10Z")
- Yes, I just opened the scene and made no other changes.
In order to eliminate the problem of my pc machine, I replaced a laptop, and the test also saw similar problems in Melbourne Photogrammetry.
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### Author:  [@Kevin\_Ring](https://community.cesium.com/u/Kevin_Ring)
#### Post date: [May 30, 2023, 11:47am UTC](https://community.cesium.com/t/3dtilestileset-show-s-the-problem/23840/9 "2023-05-30T11:47:00Z")
Ok, thanks, I can see this too. I wrote an issue to investigate it:
>
>
> As reported here:
> https://community.cesium.com/t/3dtilestileset-show-s-the-prob…lem/23840/4
>
> These cracks don't exist in Cesium for Unreal so I don't think it's a problem with the tileset. I also don't think they used to exist in Cesium for Unity, even, so we likely introduced them recently. Possibly in #278 or #287?
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### Author:  [@janine](https://community.cesium.com/u/janine)
#### Post date: [June 2, 2023, 6:27pm UTC](https://community.cesium.com/t/3dtilestileset-show-s-the-problem/23840/10 "2023-06-02T18:27:49Z")
Just to update, a fix for this issue has been included with the Cesium for Unity v1.3.0 release. Feel free to try it out and let us know if there are any further issues.
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### Author:  [@chiqiangzhe](https://community.cesium.com/u/chiqiangzhe)
#### Post date: [June 5, 2023, 1:38am UTC](https://community.cesium.com/t/3dtilestileset-show-s-the-problem/23840/11 "2023-06-05T01:38:46Z")
Thanks, this problem has been solved well in the new version, I will continue to test more datas