# With custom terrain tile.. terrain does not show, when camera is at certain position

**URL:** <https://community.cesium.com/t/with-custom-terrain-tile-terrain-does-not-show-when-camera-is-at-certain-position/31443>\
**Category:** CesiumJS\
**Created:** [April 15, 2024, 5:35am UTC](https://community.cesium.com/t/with-custom-terrain-tile-terrain-does-not-show-when-camera-is-at-certain-position/31443 "2024-04-15T05:35:45Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![gljhj73](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/gljhj73/32/22950_2.png) [@gljhj73](https://community.cesium.com/u/gljhj73)\
**Post date:** [April 15, 2024, 5:35am UTC](https://community.cesium.com/t/with-custom-terrain-tile-terrain-does-not-show-when-camera-is-at-certain-position/31443/1 "2024-04-15T05:35:45Z")

</div>

I generated terrain tiles … and strange behavior happens…

this is normal …

 ![1](https://global.discourse-cdn.com/cesium/original/3X/e/d/edde786ba53f3cddf75a66356aa5ca437c9950f5.jpeg)

but, when I move camera postion slightly…

 ![2](https://global.discourse-cdn.com/cesium/original/3X/c/6/c6a8e57a2dad5c656a91a7d4874bccbd7b1d4c86.jpeg)

suddenly, L:2 , X:7, Y:1 tile does not show.

and If I move camera postion slightly again…  
that tile appears again…

this always happens at longitude 0 (zero).  
other region is fine.

I think cesium JS will judge visibility with bounding box and Horizon Occlusion point.  
so, did I miscalculate them?  
or something else can cause this error?