Please check out 3D Anaglyph Pro on the Unity asset store for a significantly better alternative implementation to this effect.
This implementation suffers from numerous limitations, lacks customisation, and is generally very inaccurate. This was an effect I wrote when I didn't fully understand how 3D anaglyphs are generated and hence involved a fairly naïve approach and a lot of guesswork.
3-D Anaglyph effect for Unity3D, as requested by Tim. Originally featured here