From: Neal Tucker <ntucker@vax.area.com>
  To  : ggi-develop@eskimo.com
  Date: Wed, 19 Aug 1998 17:58:51 -0700

Re: LibGGI3D RFC

> > > III. Design specifics.
> > > 
> > > * struct camera { float x1, y1, z1, x2, y2, z2 }. Every LibGGI3D display
> > > will have a camera struct attached to it.  A generic hook for arbitrary
> > > display data should also be present - the shaders might use it.  void
> > > *private_data. 

I'm just skimming this thread, but this caught my eye...
Don't you need at least three points to define a camera
(i.e. position, view direction, top-of-head direction)?

-Neal Tucker