Terrain in 3d-tiles branch constantly refreshes

[tfili]

If you load a buildings tileset on Terrain, the terrain constantly reloads/unloads. I'll send the tileset offline. Just load that tileset in the Sandcastle 3dTiles example and enable terrain.

[pjcozzi]

@lilleyse can you look at this? Perhaps also test the request scheduler branch off of master.

[lilleyse]

Yes I'll look into this.

[tsmith717]

please ping me when this fix is in - we have 3 customers that need this. Thanks!

[lilleyse]

It looks like this is actually a bug in master, not 3d-tiles or RequestScheduler related. If you turn terrain on while the flat terrain is still loading, you may run into this issue.

[lilleyse]

Test with the following Sandcastle code:

var viewer = new Cesium.Viewer('cesiumContainer');
viewer.camera.setView({
    destination : Cesium.Cartesian3.fromRadians(-1.7057552114756511, 0.5283611246285218, 825.9580134720799)
});

Then quickly turn terrain on before the globe fully loads.

[lilleyse]

The problems are starting with: #3593 @bagnell You may have a better idea here.

This code should reproduce the problem:

var viewer = new Cesium.Viewer('cesiumContainer');
viewer.camera.setView({
    destination : Cesium.Cartesian3.fromRadians(-1.7057552114756511, 0.5283611246285218, 825.9580134720799)
});

var cesiumTerrainProviderMeshes = new Cesium.CesiumTerrainProvider({
    url : '//assets.agi.com/stk-terrain/world',
    requestWaterMask : true,
    requestVertexNormals : true
});

window.setTimeout(function() {
    viewer.terrainProvider = cesiumTerrainProviderMeshes;
}, 1000);

[bagnell]

I found the issue and am working on a fix.

[pjcozzi]

Fixed in #3696.