AnalyticalGraphicsInc/cesium — pull request #1997 by kring (2014-07-30 02:57:38+00:00)
Title: Remove the ability to specify a function for layer properties.

For example, gamma, alpha, hue, etc. The main motivation is that these functions took a `FrameState`, which is now private. But really the function feature isn't very worthwhile, so I removed it entirely.

As discussed briefly in #1988.