# Polylines positions changing during camera movement

**URL:** <https://community.cesium.com/t/polylines-positions-changing-during-camera-movement/18843>\
**Category:** CesiumJS\
**Created:** [May 30, 2022, 3:09pm UTC](https://community.cesium.com/t/polylines-positions-changing-during-camera-movement/18843 "2022-05-30T15:09:30Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![skyebrowse\_kamil](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/skyebrowse_kamil/32/3476_2.png) [@skyebrowse\_kamil](https://community.cesium.com/u/skyebrowse_kamil)\
**Post date:** [May 30, 2022, 3:09pm UTC](https://community.cesium.com/t/polylines-positions-changing-during-camera-movement/18843/1 "2022-05-30T15:09:30Z")

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Hi,

Im developing 3d models preview with usage of Cesium. I encounter issue when creating measurements with usage of polylines. During change of camera polylines seems to change positions. Problem is not occuring for points. I’m using chrome/safari on mac.

The easiest way to see issue it’s to preview sandcastle example:

> **[Cesium Sandcastle](https://sandcastle.cesium.com/?src=Sample%20Height%20from%203D%20Tiles.html)**
>
> The Cesium Sandcastle provides an interactive environment for testing Cesium code.

I’m attaching preview gif’s with the issue

![ezgif.com-gif-maker (1)](https://global.discourse-cdn.com/cesium/original/3X/f/c/fc3b3b61db39593a6758408472c4a0943f3380fa.gif)  
 ![ezgif.com-gif-maker](https://global.discourse-cdn.com/cesium/original/2X/6/650dd8c9fd95b3c45dbd04c16bff22b5bc1e6edc.gif)

I’ll be glad for any help how to solve issue or what’s it’s causing it 🙂

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**Author:** ![scottUFR](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/scottufr/32/3458_2.png) [@scottUFR](https://community.cesium.com/u/scottUFR)\
**Post date:** [June 1, 2022, 4:58pm UTC](https://community.cesium.com/t/polylines-positions-changing-during-camera-movement/18843/2 "2022-06-01T16:58:50Z")

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You might be having a Mac-specific problem. I am not seeing any jittery rendering in Chrome 102.0.5005.63 with Intel UHD graphics or in Edge 102.0.1245.30 with NVIDIA RTX A2000.7

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**Author:** ![skyebrowse\_kamil](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/skyebrowse_kamil/32/3476_2.png) [@skyebrowse\_kamil](https://community.cesium.com/u/skyebrowse_kamil)\
**Post date:** [June 2, 2022, 2:16pm UTC](https://community.cesium.com/t/polylines-positions-changing-during-camera-movement/18843/3 "2022-06-02T14:16:31Z")

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Oh yes, it’s possible. I asked couple more peoples to test and it seems like mac related problem. On all tested mac’s problem occurs, on windows/linux systems all worked well.

Any ideas how this problem could be solved?

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**Author:** ![Gabby\_Getz](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/gabby_getz/32/7838_2.png) [@Gabby\_Getz](https://community.cesium.com/u/Gabby_Getz)\
**Post date:** [June 7, 2022, 8:08pm UTC](https://community.cesium.com/t/polylines-positions-changing-during-camera-movement/18843/4 "2022-06-07T20:08:49Z")

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Agreed. This resembles [an issue we’ve been looking into](https://github.com/CesiumGS/cesium/issues/9907) which seems to only occur on M1 hardware. We’ve been pursuing support thread with the WebGL community and Apple to attempt to get to the bottom of the problem. We’ll update that issue with any news.