camera.costrainedAxis ==> An error occurred while rendering. Rendering has stopped.

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Sep 13, 2019, 9:09:58 AM9/13/19

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1. A concise explanation of the problem you're experiencing.

I'm trying to limit the tilt of the camera (not too near the ground), so I'm using camera.costrainedAxis.

I did some test to understand how it work but I get the error:

An error occurred while rendering. Rendering has stopped.

TypeError: Cannot read property 'southwest' of undefined

2. A minimal code example. If you've found a bug, this helps us reproduce and repair it.

viewer.scene.camera.constrainedAxis = new Cesium.Cartesian3(45, 45, 45); // just for test

3. Context. Why do you need to do this? We might know a better way to accomplish your goal.

When tilting, to limit the height of the camera from the ground in 3d mode, because

1) I don't want to see the horizon

2) often times the camera goes under the ground

4. The Cesium version you're using, your operating system and browser.

1.61

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Sep 13, 2019, 11:20:18 AM9/13/19

to cesium-dev

I think the constrained axis has to be a unit cartesian, so you might need to normalize it.

There's an example using it in the camera Sandcastle:

Click "set camera reference frame" to see what it's doing there. Let me know if you find that helpful.

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