How do I specify the color of an ellipsoid in a CZML document?

How do I specify the color of an ellipsoid in CZML? This snippet works when I add an entity to the viewer from within the JavaScript:

let redEllipsoid = viewer.entities.add({
  "name": "red ellipsoid",
  "position": Cesium.Cartesian3.fromDegrees(-114.0, 40.0, 300000.0),
  "ellipsoid": {
    "radii": new Cesium.Cartesian3(200000.0, 200000.0, 300000.0),
    "material": Cesium.Color.RED.withAlpha(0.5),
    "outline": true,
    "outlineColor": Cesium.Color.BLACK
  }
});

This other snippet also works:

let redEllipsoid = viewer.entities.add({
  "name": "red ellipsoid",
  "position": {
    x: -2083516.9683773473,
    y: -4679655.730028949,
    z: 4270821.855106338
  },
  "ellipsoid": {
    "radii": {
      x: 200000,
      y: 200000,
      z: 300000
    },
    "material": Cesium.Color.RED.withAlpha(0.5),
    "outline": true,
    "outlineColor": {
      red: 0,
      green: 0,
      blue: 0,
      alpha: 1
    }
  }
});

But this snippet doesn't work (yields an ellipsoid with the default white):

let redEllipsoid = viewer.entities.add({
  "name": "red ellipsoid",
  "position": {
    x: -2083516.9683773473,
    y: -4679655.730028949,
    z: 4270821.855106338
  },
  "ellipsoid": {
    "radii": {
      x: 200000,
      y: 200000,
      z: 300000
    },
    "material": {
      "solidColor": {
        "color": {
          "rgba": [1, 0, 0, 0.5]
        }
      }
    },
    "outline": true,
    "outlineColor": {
      red: 0,
      green: 0,
      blue: 0,
      alpha: 1
    }
  }
});

And neither does this one (also yields an ellipsoid with the default white):

let redEllipsoid = viewer.entities.add({
  "name": "red ellipsoid",
  "position": {
    x: -2083516.9683773473,
    y: -4679655.730028949,
    z: 4270821.855106338
  },
  "ellipsoid": {
    "radii": {
      x: 200000,
      y: 200000,
      z: 300000
    },
    "material": {
      "color": {
        red: 1,
        green: 0,
        blue: 0,
        alpha: 0.5
      }
    },
    "outline": true,
    "outlineColor": {
      red: 0,
      green: 0,
      blue: 0,
      alpha: 1
    }
  }
});

And neither does this one (also yields an ellipsoid with the default white):

let redEllipsoid = viewer.entities.add({
  "name": "red ellipsoid",
  "position": {
    x: -2083516.9683773473,
    y: -4679655.730028949,
    z: 4270821.855106338
  },
  "ellipsoid": {
    "radii": {
      x: 200000,
      y: 200000,
      z: 300000
    },
    "material": {
      red: 1,
      green: 0,
      blue: 0,
      alpha: 0.5
    },
    "outline": true,
    "outlineColor": {
      red: 0,
      green: 0,
      blue: 0,
      alpha: 1
    }
  }
});

I am particularly confused, since feeding Cesium.Color.RED.withAlpha(0.5) into the console after Cesium has loaded returns ne {red: 1, green: 0, blue: 0, alpha: 0.5}. One would expect that giving the object specified by the static member would work...

Here is the type of "material". Since it's an abstract class with no attributes, am I out of luck in specifying it via CZML? It would be a real drag if the only way to set the color of an ellipsoid required post-processing, since I want to be able to do the heavy lifting offline, and just load the CZML in the browser.

Via Active questions tagged javascript - Stack Overflow https://ift.tt/tPli4oC