Long Trail Time Reduces Performance

[mmcgarity]

I'm trying to playback 3-6 month tracks durations, with a trail time of about a week, and I'm finding the performance of Cesium be reduced substantially. The entire UI just slows down, and you can barely use it.

This is with a small amount of track data, the duration just happens to be a long period and that destroys Cesium.

Here's some example code which is basically the same as the CZML Path example:

var czml = [{
    "id" : "document",
    "name" : "CZML Path",
    "version" : "1.0",
    "clock": {
        "interval": "2012-08-04T10:00:00Z/2013-08-04T15:00:00Z",
        "currentTime": "2012-08-04T10:00:00Z",
        "multiplier": 10
    }
}, {
    "id" : "path",
    "name" : "path with GPS flight data",
    "description" : "<p>Hang gliding flight log data from Daniel H. Friedman.<br>Icon created by Larisa Skosyrska from the Noun Project</p>",
    "availability" : "2012-08-04T10:00:00Z/2013-08-04T15:00:00Z",
    "path" : {
        "material" : {
            "polylineOutline" : {
                "color" : {
                    "rgba" : [255, 0, 255, 255]
                },
                "outlineColor" : {
                    "rgba" : [0, 255, 255, 255]
                },
                "outlineWidth" : 5
            }
        },
        "width" : 8,
        "leadTime" : 10,
        "trailTime" : 1000,
        "resolution" : 5
    },
    "billboard" : {
        "image" : "http://maps.google.com/mapfiles/kml/pushpin/blue-pushpin.png",
        "scale" : 1.5,
        "eyeOffset": {
            "cartesian": [ 0.0, 0.0, -10.0 ]
        }
    },
    "position" : {
        "epoch" : "2012-08-04T10:00:00Z",
        "cartographicDegrees" : [
            0,-122.93797,39.50935,1776,
            31575490,-122.94563,39.44125,566
        ]
    }
}];


var viewer = new Cesium.Viewer('cesiumContainer', {
baseLayerPicker : false
});

viewer.dataSources.add(Cesium.CzmlDataSource.load(czml)).then(function(ds) {
viewer.trackedEntity = ds.entities.getById('path');
});

[denverpierce]

Try adjusting the resolution as a workaround. 1 week * 7 days * 24 hrs * 60 minutes/hr at a 5 second resolution makes a lot of extraneous data points, slowing things down.

[pjcozzi]

Thanks for the idea @denverpierce. @mmcgarity any luck with this?

Perhaps it would be best to discuss on the Cesium forum first, and then submit an issue if there is a specific feature request or bug.

[emackey]

This may be a dup of #2310.