Updating a hidden polygon with defined height causes other hidden polygons with defined height to be shown

[pjaustin]

Updating a hidden polygon can cause other hidden polygons to be shown. It appears this only affects polygons that have a defined height (either zero or non-zero).

Sandcastle example:

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

var greenPolygon = viewer.entities.add({
    id : 'GreenPolygon',
    name : 'Green polygon',
    polygon : {
        hierarchy : Cesium.Cartesian3.fromDegreesArray([-108.0, 42.0,
                                                        -100.0, 42.0,
                                                        -104.0, 40.0]),
        material : Cesium.Color.GREEN,
        height: 0
    }
});

var bluePolygon = viewer.entities.add({
    id : 'BluePolygon',
    name : 'Blue polygon',
    polygon : {
        hierarchy : {
            positions : Cesium.Cartesian3.fromDegreesArray([-99.0, 30.0,
                                                            -85.0, 30.0,
                                                            -85.0, 40.0,
                                                            -99.0, 40.0]),
        },
        material : Cesium.Color.BLUE,
        height: 0
    }
});

viewer.entities.add({
    id : 'RedPolygon',
    polygon : {
        hierarchy : {
            positions : Cesium.Cartesian3.fromDegreesArray([-108.0, 30.0,
                                                            -100.0, 30.0,
                                                            -104.0, 32.0]),
        },
        material : Cesium.Color.RED,
        //height: 0
    }
});

Sandcastle.addToolbarButton('Hide', function(){
    viewer.entities.values.forEach(function (entity) {
        entity.show = false;
    });
});

Sandcastle.addToolbarButton('Update green polygon', function(){
    var entity = viewer.entities.getById('GreenPolygon');

    entity.polygon = new Cesium.PolygonGraphics({
        hierarchy : Cesium.Cartesian3.fromDegreesArray([-108.0, 42.0,
                                                        -100.0, 42.0,
                                                        -104.0, 40.0]),
        material : Cesium.Color.GREEN,
        height: 0
    });
});

viewer.zoomTo(viewer.entities);

• Click Hide button to hide all the polygons
• Click Update green polygon button
• The blue polygon (which has a defined height) is incorrectly shown. The red polygon (which does not have a defined height) is correctly not shown. The green polygon correctly remains hidden.

#2909 appears related, but it's not clear whether this is the same issue.

[hpinkos]

Thanks for reporting this @pjaustin! It looks like I might have broken this with other fixes I made regarding polygon show in the 1.48 release. I'll try to get a fix in for the next release.

Meanwhile, if you use entity.polygon.show = false instead of entity.show = false it should work as expected. You'll just need to pass show: false to the new PolygonGraphics in your update function.

[hpinkos]

Thanks again for reporting this @pjaustin! The fix in #7156 has been merged into master and will be included in the 1.51 release available November 1st.

[pjaustin]

Thanks for the workaround and quick fix @hpinkos. We'll update to the new release at some point soon.