AnalyticalGraphicsInc/cesium — pull request #1509 by mramato (2014-02-26 20:45:36+00:00)
Title: Fix EllipsoidGeometryUpdater crash for ellipsoid with a 0 radii component

EllipsoidGeometryUpdater has a fast path that scales a unit sphere rather than recreate geometry every frame. It was crashing due to a bad model matrix if the radii ever went to zero. This change simply clamps values to 0.001, which visually has the same affect.