Hi, I'm trying to show the map more clearly without stretching tiles (ie, so that the size of the tile 256x256 held on screen 256x256).
I'm find this: http://openlayers.org/ol3-cesium/
The setting you’re probably looking for is viewer.scene.globe.maximumScreenSpaceError = 1; This value defaults to 2 which loads less tiles but produces less crisp imagery. When we refactor our tile loading algorithms to be more efficient, we will most likely make 1 the default.