Incorrect Model animation

[hpinkos]

The error happens when creating more than 1 model using new Model(). It looks like the second models animation is using the rotation from the first model.

In the example below, the truck wheels use the rotation of the plane propellers.

I've included a sandcastle example below. To reproduce, switch between truck and plane twice. The first time creates the models using fromGltf. The second time creates the models using new Model and the truck should show the bad animation.

var viewer = new Cesium.Viewer('cesiumContainer');
var scene = viewer.scene;

var planegltf;
var groundgltf;

function createModel(url, height, name) {
    height = Cesium.defaultValue(height, 0.0);

    var modelMatrix = Cesium.Transforms.northEastDownToFixedFrame(Cesium.Cartesian3.fromDegrees(-123.0744619, 44.0503706, height));

    scene.primitives.removeAll(); // Remove previous model
    var options = {
        modelMatrix : modelMatrix,
        minimumPixelSize : 128
    };
    var model;
    if (name === 'plane' && Cesium.defined(planegltf)) {
        options.gltf = planegltf;
        model = scene.primitives.add(new Cesium.Model(options));
    } else if (name === 'ground' && Cesium.defined(groundgltf)) {
        options.gltf = groundgltf;
        model = scene.primitives.add(new Cesium.Model(options));
    } else {
        options.url = url;
        model = scene.primitives.add(Cesium.Model.fromGltf(options));
    }

    model.readyToRender.addEventListener(function(model) {
        if (name === 'plane' && !Cesium.defined(planegltf)) {
            planegltf = model.gltf;
        }

        if (name === 'ground' && !Cesium.defined(groundgltf)) {
            groundgltf = model.gltf;
        }

        // Play and loop all animations at half-spead
        model.activeAnimations.addAll({
            speedup : 0.5,
            loop : Cesium.ModelAnimationLoop.REPEAT
        });

        // Zoom to model
        var center = Cesium.Matrix4.multiplyByPoint(model.modelMatrix, model.boundingSphere.center, new Cesium.Cartesian3());
        var transform = Cesium.Transforms.eastNorthUpToFixedFrame(center);
        var camera = scene.camera;
        camera.transform = transform;
        var controller = scene.screenSpaceCameraController;
        var r = 2.0 * Math.max(model.boundingSphere.radius, camera.frustum.near);
        controller.minimumZoomDistance = r * 0.5;
        camera.lookAt(new Cesium.Cartesian3(r, r, r), Cesium.Cartesian3.ZERO, Cesium.Cartesian3.UNIT_Z);
    });
}

///////////////////////////////////////////////////////////////////////////

var options = [{
text : 'Aircraft',
onselect : function() {
    createModel('../../SampleData/models/CesiumAir/Cesium_Air.gltf', 5000.0, 'plane');
    }
}, {
text : 'Ground vehicle',
    onselect : function() {
        createModel('../../SampleData/models/CesiumGround/Cesium_Ground.gltf', 0.0, 'ground');
    }
}];

Sandcastle.addToolbarMenu(options);