[Fieldtrip] Adding lighting to FieldTrip

Hello All, I'm working on adding lighting to the FieldTrip library (ticket http://trac.haskell.org/FieldTrip/ticket/16). I have some initial data types here: http://hpaste.org/12975 I'm thinking that the GContext will keep track of which of the 8 opengl lights are used and enable them if they are. I was wondering what ideas folks have had with lighting. Some issues that are on my mind: - OpenGL limits the number of lights to 8. - It would be nice, for a spotlight primitive, to allow the light's position and a point it is pointing toward to go through different transformations. This would allow a fixed light to follow an object, for example. I don't know yet how to provide this functionality. Thanks, David