Entity with time-dynamic ellipsoid doesn't know its position

[emackey]

This demo shows our typical AGI example entity, with an Ellipsoid attached with time-dynamic radii. If you follow this entity with any of trackedEntity, selectedEntity, or zoomTo, the camera and/or selector will travel deep into the Solar System, very far from the Earth.

This was not a bug in Cesium 1.25 and 1.26. It first appears in Cesium 1.27, and is present in 1.29 and in master today. I have not yet had time to bisect any more finely than that, but I plan to.

var czml = [{
    "id" : "document",
    "name" : "Basic CZML billboard and label",
    "version" : "1.0",
    "clock":{
      "interval":"2017-01-20T12:00:00Z/2017-01-20T13:00:00Z",
      "currentTime":"2017-01-20T12:00:00Z",
      "multiplier":300,
      "range":"LOOP_STOP"
    }
}, {
    "id" : "some-unique-id",
    "name" : "AGI",
    "description" : "<p><a href='http://www.agi.com' target='_blank'>Analytical Graphics, Inc.</a> (AGI) founded Cesium.</p>",
    "billboard" : {
        "image" : "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACvSURBVDhPrZDRDcMgDAU9GqN0lIzijw6SUbJJygUeNQgSqepJTyHG91LVVpwDdfxM3T9TSl1EXZvDwii471fivK73cBFFQNTT/d2KoGpfGOpSIkhUpgUMxq9DFEsWv4IXhlyCnhBFnZcFEEuYqbiUlNwWgMTdrZ3JbQFoEVG53rd8ztG9aPJMnBUQf/VFraBJeWnLS0RfjbKyLJA8FkT5seDYS1Qwyv8t0B/5C2ZmH2/eTGNNBgMmAAAAAElFTkSuQmCC",
        "scale" : 1.5
    },
    "label" : {
        "fillColor" : {
            "rgba" : [255, 255, 255, 255]
        },
        "font" : "12pt Lucida Console",
        "horizontalOrigin" : "LEFT",
        "pixelOffset" : {
            "cartesian2" : [8, 0]
        },
        "style" : "FILL",
        "text" : "AGI",
        "showBackground" : true,
        "backgroundColor" : {
            "rgba" : [112, 89, 57, 200]
        }
    },
    "position" : {
        "cartesian":[
            1216361.4096947117, -4736253.175342511, 4081267.4865667094
        ]
    },
    "ellipsoid":{
      "radii":{
        "epoch":"2017-01-20T12:00:00Z",
        "cartesian":[
            0, 200000, 100000, 250000,
            3600, 400000, 200000, 500000
        ]
      },
      "material":{
        "grid":{
          "color":{
            "rgba":[
              255,255,0,255
            ]
          },
          "lineCount":{
            "cartesian2":[
              12,12
            ]
          }
        }
      }
    }
}];

var viewer = new Cesium.Viewer('cesiumContainer');
Cesium.CzmlDataSource.load(czml).then(function(dataSource) {
    viewer.dataSources.add(dataSource);
    viewer.zoomTo(dataSource);
});

[shunter]

probably the same as #4866

[pjcozzi]

OK to close as duplicate? Perhaps add the above code example there as another test case?

[emackey]

Closing as likely due to same cause as #4866.