Tiles outside the cone are potentially deferred.
Added Cesium3DTileset.foveatedConeSize option to control the cone size that determines which tiles are deferred for loading. Added Cesium3DTileset.foveatedScreenSpaceError option to prioritize loading tiles in the center of the screen. Maptiler cloud wmts unable to connect full#
This can help get a quick layer of tiles down while full resolution tiles continue to load.
Added Cesium3DTileset.progressiveResolutionHeightFraction option to load tiles at a smaller resolution first. Good for additive refinement point clouds. Added Cesium3DTileset.preferLeaves option to prefer loading of leaves. Added Cesium3DTileset.preloadFlightDestinations option to preload tiles at the camera's flight destination while the camera is in flight. Larger is more aggressive culling, smaller less aggressive culling. Added Cesium3DTileset.cullRequestsWhileMovingMultiplier option to act as a multiplier when used in culling requests while moving. Added Cesium3DTileset.cullRequestsWhileMoving option to ignore requests for tiles that will likely be out-of-view due to the camera's movement when they come back from the server. 
Added the following tileset optimizations, which unless stated otherwise are enabled by default. Tile load priority changed to focus on loading tiles in the center of the screen first. And for general camera movement, ~20% load time reduction with ~27% tile load count reduction.
Improved 3D Tiles streaming performance, resulting in ~67% camera tour load time reduction, ~44% camera tour load count reduction.
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