# scene.pickPosition Bug in latest  Versioin 1.31

**URL:** <https://community.cesium.com/t/scene-pickposition-bug-in-latest-versioin-1-31/5336>\
**Category:** CesiumJS\
**Created:** [March 28, 2017, 8:30am UTC](https://community.cesium.com/t/scene-pickposition-bug-in-latest-versioin-1-31/5336 "2017-03-28T08:30:29Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![FKAss](https://avatars.discourse-cdn.com/v4/letter/f/958977/32.png) [@FKAss](https://community.cesium.com/u/FKAss)\
**Post date:** [March 28, 2017, 8:30am UTC](https://community.cesium.com/t/scene-pickposition-bug-in-latest-versioin-1-31/5336/1 "2017-03-28T08:30:29Z")

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i want to draw a polygon on surface ( clamp to terrain) use scene.pickPosition,but i get incorrect position

see [http://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=Hello%20World.html&label=Showcases&gist=0303b6067ef873070cb72520b346a6bb](http://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=Hello%20World.html&label=Showcases&gist=0303b6067ef873070cb72520b346a6bb)

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**Author:** ![Rachel\_Hwang](https://avatars.discourse-cdn.com/v4/letter/r/d78d45/32.png) [@Rachel\_Hwang](https://community.cesium.com/u/Rachel_Hwang)\
**Post date:** [March 28, 2017, 5:46pm UTC](https://community.cesium.com/t/scene-pickposition-bug-in-latest-versioin-1-31/5336/2 "2017-03-28T17:46:32Z")

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Hi there,

You can correct the issue in your example by replacing

var cartesian = scene.pickPosition(movement.endPosition);

``

with

```
    var ray = viewer.camera.getPickRay(movement.position);
    var cartesian = viewer.scene.globe.pick(ray, viewer.scene);

```

``

getPickRay will get you a more precise position.

Best,

- Rachel

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<div class="post-metadata">

**Author:** ![FKAss](https://avatars.discourse-cdn.com/v4/letter/f/958977/32.png) [@FKAss](https://community.cesium.com/u/FKAss)\
**Post date:** [March 29, 2017, 2:01am UTC](https://community.cesium.com/t/scene-pickposition-bug-in-latest-versioin-1-31/5336/3 "2017-03-29T02:01:35Z")

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It works fine,thank you Rachel Hwang !

在 2017年3月29日星期三 UTC+8上午1:46:32，Rachel Hwang写道：