AnalyticalGraphicsInc/cesium — pull request #333 by bagnell (2012-11-15 20:06:25+00:00)
Title: Grazing Altitude

-Add computing the point on a ray closest to an ellipsoid.
-Adds computing the roots of quadratic, cubic, and quartic polynomials.

The test coverage for finding the roots of quartic polynomials and finding the grazing altitude location are around 70%-80% because its difficult to come up with equations/rays for all cases. I'll open an issue to improve test coverage.