SceneTransition should retain camera location

[mramato]

An extremely common request on the forum is to retain the current camera view when switching Scene modes. There are also requests for having an easy way to instantly change scenes. I, personally, have wanted this functionality forever too. We should consider adding it soon.

[WarpDrive]

Instant change is already here viewer.sceneModePicker.viewModel.duration=0; The button animation isn't instant though, perhaps that should be instant as well?

When transferring between 3D and CV if you just transfer lon/lat/alt and hea/pit/roll and fov of the camera the view can be different due to the fact that the shape of the Earth is different (accentuated at higher altitudes.) Transferring the camera view (where the 4 corners of the frustum hit the Earth) rather than the camera position/orientation could be another option, though this might not retain the camera location/orienation. So either: -retain location/orientation, but not view -retain view but not location/orientation

I wrote a cam/destination/range method here https://groups.google.com/d/msg/cesium-dev/37Hq0Hj8HSs/NHO5T959moAJ (The camera._mode statements should be swapped with viewer.scene.mode, and timeOut should be removed)

However rather than the cam/destination method, a more accurate method would be determining the globe intersection at the 4 corners of the frustum in addition to center destination (each stored as lon/lat/alt.) If enough hit the Earth you can calculate the complete frustrum you need for any mode, otherwise just transfer lon/lat/alt hea/pit/rol of the camera.

[emackey]

@WarpDrive try adding this CSS:

    .cesium-sceneModePicker-slide-svg {
        -webkit-transition: none;
        -moz-transition: none;
        transition: none;
    }