"scene3DOnly: true" causes Polyline to cull

[timoto]

scene3DOnly: true causes GroundPolylinePrimitive to be culled from the scene when zooming, tilting, rotating the polyline into certain positions.

First discussed here: https://groups.google.com/forum/?hl=en#!topic/cesium-dev/Kbxc_UXRyww

Open this Sandcastle example and zoom into Australia to see the line disappear:

var viewer = new Cesium.Viewer('cesiumContainer', {
    scene3DOnly: true,
    timeline: false,
    animation: false,
    baseLayerPicker: false,
    geocoder: false,
    selectionIndicator: false,
    infoBox: false,
    skyBox: false,
    skyAtmosphere: false,
    homeButton: false,
    fullscreenButton: false,
    navigationHelpButton: false,
    terrainProvider: Cesium.createWorldTerrain(),
});

viewer.scene.requestRenderMode = true;
viewer.scene.backgroundColor = new Cesium.Color( 255, 255, 255, 1 );

var pathBoundaries = [4.88747, 52.367, 5.11239, 52.09708, 5.11239, 52.09708, 5.11239, 52.09708, 5.11239, 52.09708, 5.11239, 52.09708, 5.11239, 52.09708, 5.11239, 52.09708, 5.11239, 52.09708, 5.11239, 52.09708, 5.11239, 52.09708, 5.11239, 52.09708, 5.11239, 52.09708, 5.11239, 52.09708, 5.11239, 52.09708, 5.11239, 52.09708, 5.11239, 52.09708, 5.11239, 52.09708, 5.11239, 52.09708, 5.11239, 52.09708, 10.18374, 53.39808, 14.42139, 50.08861, 11.26148, 43.76885, 23.71667, 38, 3.86403, 43.61175, 13.21341, 52.56254, 2.73766, 41.96195, 2.73766, 41.96195, 1.69659, 41.34703, 1.69646, 41.34581, 1.69944, 41.34472, -5.3446, 35.5786, -15.95829, 18.14911, -15.95829, 18.14911, -15.52113, 18.04593, 14.42139, 50.08861, -15.99672, 18.10819, -15.99672, 18.10819, -15.99672, 18.10819, -15.99672, 18.10819, -17.45836, 14.6822, -17.45836, 14.6822, -16.9519, 14.77151, -16.9519, 14.77151, -16.9519, 14.7715, -16.9519, 14.7715, -16.40732, 13.82349, -16.40732, 13.82349, -16.40732, 13.82349, -16.40732, 13.82349, 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14.70612, -17.4249, 14.70612, -16.4083, 13.8245, -16.4083, 13.8245, -16.36792, 13.87559, -16.4083, 13.8245, -17.4249, 14.70612, -17.4249, 14.70612, -17.4249, 14.70612, -16.9519, 14.77151, -16.9519, 14.77151, -16.40892, 13.82595, -12.2012, 14.45826, -12.2012, 14.45826, -12.2012, 14.45826, -8.84305, 14.50781, -7.98814, 12.62048, -7.98814, 12.62048, -7.98825, 12.62033, -7.98825, 12.62033, -7.98825, 12.62033, -16.40907, 13.82514, -7.96672, 12.61115, -7.96672, 12.61115, -7.96672, 12.61119, -7.99969, 12.65832, -7.99968, 12.65832, -7.99969, 12.65832, -7.98825, 12.62033, -7.98825, 12.62033, -7.9928, 12.61987, -7.98825, 12.62033, -8.44697, 11.88726, -8.44698, 11.88726, -8.44698, 11.88726, -8.44698, 11.88726, -8.44698, 11.88726, -8.44698, 11.88726, -8.4469, 11.88756, -8.44735, 11.88908, -8.44735, 11.88908, -8.44697, 11.88726, -8.44697, 11.88726, -8.44697, 11.88726, -7.9398, 12.6664, -8.44697, 11.88726, -8.44697, 11.88726, -8.44696, 11.88975, -8.44696, 11.88975, -8.44697, 11.88726, -8.44697, 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5.95869, -0.14577, 5.95869, -0.15029, 5.95849, -0.15029, 5.95849, -0.15385, 5.97743, -0.15029, 5.95849, -0.15386, 5.97742, -0.14577, 5.95869, -0.14577, 5.95869, -0.14577, 5.95869, -0.14577, 5.95869, -0.14577, 5.95869, -0.1506, 5.96022, -0.15059, 5.96023, -0.15046, 5.96087, -0.1506, 5.96022, -0.1506, 5.96022, -0.20414, 5.57036, -0.38376, 5.48419, -0.20414, 5.57036, -0.20414, 5.57036, -0.20414, 5.57036, -0.20414, 5.57036, 5.61732, 6.33371, -0.20414, 5.57036, -0.20414, 5.57036, -0.20414, 5.57036, -0.20414, 5.57036, -0.20414, 5.57036, -0.20414, 5.57036, -0.20414, 5.57036, -0.20414, 5.57036, -0.37869, 5.48642, -0.20414, 5.57036, -0.20414, 5.57036, -0.20414, 5.57036, -0.20414, 5.57036, -0.20414, 5.57036, -0.14813, 5.95954, 16.01831, -17.99718, 21.65546, -21.76295, -5.36498, 35.56161, 46.51402, -18.75897, 12.85042, -2.115, 46.47298, -18.76316, -38.4813, -12.9822, 17.2349, -19.34342, -48.01542, -9.46247, -42.50185, -13.45547, -71.59453, -39.34658, -64.3052, -19.027, -79.1203, -8.0795, -72, 11.9167, -96.72028, 17.06694, -88.91645, 14.91038, -101.60972, 19.51639, -71.5949, -39.34655, -133.7285, 68.3574, 174.00494, -35.14477, 128.61318, -18.79298, 123.59413, -10.15688, -215.7818, -51.82298, -211.02258, -52.1761, -201.91767, -53.24661, -197.2306, -52.61302, -191.98536, -53.70409, -219.4692, -49.88706, 115.26276, -8.6598];

var entity = viewer.entities.add( {
    polyline : {
    positions : Cesium.Cartesian3.fromDegreesArray( pathBoundaries ),
    width : 5,
    clampToGround : true,
    material : Cesium.Color.RED
    }
});

var polyline = entity.polyline;

then comment out scene3DOnly: true run and try again. Now line does not disappear.

It's even possible to perform on a much shorter polyline such as var pathBoundaries = [0,0, -30,0] if the line is then zoomed right in, tilted and rotated to the bottom of the screen.

Seen on
iOS 11.4.1 in Safari, Chrome, DuckDuck
Windows 7 64bit SP1 in Chrome, FireFox

Present in Cesium 1.48 and 1.49

[likangning93]

Thanks for the report and the easily-reproducible Sandcastle @timoto! We'll try to get to this soon.

[cesium-concierge]

Congratulations on closing the issue! I found these Cesium forum links in the comments above:

https://groups.google.com/forum/?hl=en#!topic/cesium-dev/Kbxc_UXRyww

If this issue affects any of these threads, please post a comment like the following:

The issue at #7043 has just been closed and may resolve your issue. Look for the change in the next stable release of Cesium or get it now in the master branch on GitHub https://github.com/AnalyticalGraphicsInc/cesium.

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[hpinkos]

Thanks for the bug report @timoto! This has been fixed and will be included in the 1.50 release available on October 1st

[timoto]

@hpinkos Thanks for the fast turn around. Will certainly test on release.