[Fieldtrip] Adding lighting to FieldTrip

[Conal Elliott]

In TBAG, ActiveVRML/DirectAnimation, and Fran, I embedded lights into
geometry, which allows them to be spatially transformed.  Looking in
Graphics.FieldTrip.Geometry3, you'll see a comment placeholder for lights.

OpenGL is a temporary implementation convenience, so I wouldn't design the
API around it.  If more lights get added to a geometry than the current
implementation can handle, we can document the limitation and drop some of
them at run-time.

  - Conal

On Thu, Dec 11, 2008 at 12:52 PM, David Sankel <camior at gmail.com> wrote:

> 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
>
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