AnalyticalGraphicsInc/cesium — pull request #437 by kring (2013-01-04 15:59:54+00:00)
Title: Add BoundingSphere.fromExtentWithHeights2D

This is coming from the terrain branch, and is used there to create a bounding sphere for terrain tile culling in Columbus View. I'm creating separate pull requests for stuff that can go into master ahead of the terrain support itself.