I tried the sandcastle demo with polygons (http://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=Polygons.html). The problems is that the polygons are not uniform and are blinking.
This happens on my macbook pro with an intel IRIS, be it in chrome 36 or Firefox . You may see the effect here : https://dl.dropboxusercontent.com/u/18096174/Capture%20d’écran%202014-08-06%20à%2013.25.21.png
A loy of demos work correctly on the mac but no this one.
This does not happen on my PC.
What may I do to avoid that issue ?