CesiumGS / CesiumGS/cesium

Control camera up for viewFrom entity tracking

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category - entity type - enhancement
Dominant language
JavaScript
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Description

Dear Cesium Team

I am experiencing some camera handling issues while using 'trackedEntity': The camera rotation seems to be locked to an angle that is off by 90 degrees from what I am looking for (camera behind aircraft/horizontal horizon), see:
![cesium_github_screenshot](https://user-images.githubusercontent.com/15689124/68085363-88eb6100-fe40-11e9-8ccc-63e39071209f.png)
The sandbox example is [here](https://sandcastle.cesium.com/index.html#c=zVZdb9s2FP0rgl8iLRplL0tWJG4wN+mQDivq1cFe6iKgJdrmRpEqSfmjhf97L0lRouU22MMepiCJdHnuveceXn5ssIw2lGyJjF5GnGyjO6JoXaK/rC0+y+3nneAaU07kWRp9mfMIHsqX4pXYRdfREjNFUmdVhJFcU8Hf8ILmWAvZB6xxIbYKrFrWnVHUrJhwWmJNmqE5PyQ3c25+NsCxEoqauOqY5gyXFSPFtBmdSlERqfexcTVuQlIC1J/x9B6N+c8aKEgOeJe9zYsU0W84jFWC2XjvKmuPWz2CsXuyksRU8lP6jdEJWwEvvS4B0KR9ILKkmkwF23NRUswmVSXFzggCDq0WYTn/C0JznmWRpiXlq6jCEpdOdr6YkVzwwmh+NWzmQmks9fEk/F4zivk9SI642LazprSoAHgKwkXRBI5ttLTLlH47bpzYoLabERAlDNoYfRaifBQ+hknnyjHFSPw3tLCQ+7Ag0OmJcmro//wLumx4MsG99UVrxKyFjobw3PgWXhNcgE5+0MtSUZ2v+0YpGAttPobhkddSBgSCT5O6+TxOGWBcusBgU7VeS1ixsTFTmxn+jTuN4fP8PDE7wFx7JgDz4txYe0PJ2L085xDmh+jiaph1oQzW8wWsV83azW+WheQBcSSfizh6cRzRNPYzXg2iUwDGO/Vt5lYMGGrnoOVkdDE99C97kz7bkz4g7DBPtIt4B67whvkFWkpRuoWrotjrmrY9kLbzbcPZYOtKhsEeXPVTU+R7KCcMGYdKpYEqadcSiZPMR/9Um5nuwj9KzBV0TKnQupep20djW2DqqAUBu53VKGd349iImzpFXE1HG14f5+gY4MGtkGXN7eET5ZJA+reiICyuJYPkhK7WOvGHV7MfQGigQBSSpBQbMmEsdjNjMVCwBeyh4L4DUPH7rHk4Ls3malJ1Rl8gDLS1BsNBaYAICw1ApSkBhoNc5qklPUln4dCuZV1O6Y6wGf1sN/zLqz4I7wxolmNmAWaT6hCHAI03mDK8oMyIcB028yNMgD18NpjdwXS7Qz/+8B1I3ONvF8i1+5f2h0R1bf8GnJKPSSgs1usTSSRRgtWNmqOTkoEHHGLd+QakhUTvX9+jLRx8E1atcTxEF0nPcUsLk2v0HYFMW/wGS+pIm24Fxz/aE2A4TKP2ZZj4Bjs0i8E3F5w8+T+keO17zjWf7257m6n8ReZDU70mOw1FnU2ozCVe6rOGHKDsTczcvppFESehZOEKOUMocwsLdiec2Z5TmasGAjdvT/CKVmwBV8BLqAQNPX2gd2ivhZ7Qg9AROESvMGNC8P+cVxP3+KuhNzqh99Gu6hnmRY6VZnazfhSCLbB8S3gdN8Ial0E6GCu9Z+TWuf9Ky0rAvQUWWwx8NAE+wFBlixpmS6NcWbdx5p3GBd1EtHg5H/TuzvNBlDOsFIwsa2bX53xwO84Af+TGhN1K322IZHhvIOvR7R/OiBAaZ/B56qVdOUHErw).

Thank you very much for any insight!

Contributor guide

Open the contributing guide

Research direction

Reproduce the behavior in the linked Sandcastle example, starting with the trackedEntity and viewFrom camera handling described in the issue. Compare the current camera orientation with the requested behind-aircraft, horizontal-horizon view; done means the camera can control its up direction without the reported 90-degree offset.

Written by the indexing model from the issue text.

Assessment

Tech stack
javascript
Domain
computer-graphics
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
28/100

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