I am trying to render some simple polygons on the surface of the globe in the 3 different perspectives (2D, 2.5D and 3D sphere). However, when rendering in the 2.5D perspective, the polygons do not at first appear and only "start" to appear as I zoom into the globe (see e.g., http://cesium.agi.com/Cesium/Apps/Sandcastle/index.html?src=Circles%20and%20Ellipses.html with the 2.5D view and zoom in and out on the circles)
Is there some way to change it so that the polygons are visible at all zoom levels?