# Change orientation, position of a polyline
**URL:** https://community.cesium.com/t/change-orientation-position-of-a-polyline/7244
**Category:** CesiumJS
**Created:** [August 2, 2018, 8:48pm UTC](https://community.cesium.com/t/change-orientation-position-of-a-polyline/7244 "2018-08-02T20:48:42Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Brian\_Krasner](https://community.cesium.com/u/Brian_Krasner)
#### Post date: [August 2, 2018, 8:48pm UTC](https://community.cesium.com/t/change-orientation-position-of-a-polyline/7244/1 "2018-08-02T20:48:42Z")
**1. A concise explanation of the problem you’re experiencing.**
I have a model of a spacecraft, which I can successfully change orientation and position with properties. I would like to have a polyline(s) coming out of the spacecraft at the same orientation, positions - emulate some sort of rays.
**2. A minimal code example. If you’ve found a bug, this helps us reproduce and repair it.**
**3. Context. Why do you need to do this? We might know a better way to accomplish your goal.**
Basically want to show spacecraft emitting rays that travel from the vehicle to the ground.
**4. The Cesium version you’re using, your operating system and browser.**
1.45.0, windows, chrome
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### Author:  [@Gabby\_Getz](https://community.cesium.com/u/Gabby_Getz)
#### Post date: [August 3, 2018, 9:30pm UTC](https://community.cesium.com/t/change-orientation-position-of-a-polyline/7244/2 "2018-08-03T21:30:04Z")
Hi Brian,
Could you maybe provide a sample image? I’m not sure exactly what your looking for, but I believe adding a [path](https://cesiumjs.org/Cesium/Build/Documentation/PathGraphics.html) to your entity will be what your looking for. You can specify leadTime and/or trailTime to display a line in front of or behind your entity respectively.
Thanks,
Gabby
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### Author:  [@Brian\_Krasner](https://community.cesium.com/u/Brian_Krasner)
#### Post date: [August 3, 2018, 10:33pm UTC](https://community.cesium.com/t/change-orientation-position-of-a-polyline/7244/3 "2018-08-03T22:33:20Z")
Thanks for the quick reply. Let me ask you a different question:
In the SandCastle example [https://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=Interpolation.html](https://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=Interpolation.html)
a plane model is changing its position and orientation. There is a path that’s shown but it is not involved in calculating the position or the orientation.
Now suppose I wanted to create a polygongeometry that traveled alongside the plane that changed its position and orientation at the same times the plane did.
Is that possible?
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### Author:  [@Brian\_Krasner](https://community.cesium.com/u/Brian_Krasner)
#### Post date: [August 3, 2018, 10:34pm UTC](https://community.cesium.com/t/change-orientation-position-of-a-polyline/7244/4 "2018-08-03T22:34:06Z")
Thanks for the quick reply. Let me ask you a different question:
In the SandCastle example [https://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=Interpolation.html](https://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=Interpolation.html)
a plane model is changing its position and orientation. There is a path that’s shown but it is not involved in calculating the position or the orientation.
Now suppose I wanted to create a polygongeometry that traveled alongside the plane that changed its position and orientation at the same times the plane did.
Is that possible?
---
### Author:  [@Gabby\_Getz](https://community.cesium.com/u/Gabby_Getz)
#### Post date: [August 6, 2018, 7:09pm UTC](https://community.cesium.com/t/change-orientation-position-of-a-polyline/7244/5 "2018-08-06T19:09:45Z")
Sure, use a [Callback Property](https://cesiumjs.org/Cesium/Build/Apps/Sandcastle/index.html?src=Callback%20Property.html) for each of the properties you want to mirror, and return the value of the plane entity’s property for each.
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### Author:  [@Brian\_Krasner](https://community.cesium.com/u/Brian_Krasner)
#### Post date: [August 7, 2018, 2:05am UTC](https://community.cesium.com/t/change-orientation-position-of-a-polyline/7244/6 "2018-08-07T02:05:41Z")
Looks like what I’m looking for. Thanks