Richard Gillilan:
|Hi Randall. It's fantastic to see someone working on the OpenGl
|parts. Every thought of enabling glFog? I've wanted this function for
|years because linear black fog (depth cuing) is a pretty essential
|feature for any molecular modeling program. I've looked at some of the
|source code, and will make a serious attempt at it soon, but you may have
|already thought about it. It would seem like a natural for enviro-viz
|uses.
The pure OpenGL bits should be pretty simple. The questions in my mind
relate to how this would map to the data model (which objects are affected
by it, are the fog bits object attributes or global Render settings, are
screen objects exempt, ...)
Conceptually it's a scene attribute, so it'd be a shame to have to set it
identically on all the fields in a scene (can Options even do this?).
Maybe something like Transform that affects a tree of objects, like fog
attributes on a Group node? I think that's a departure from the current
model however.
Hopefully Greg will have some insight on this.
In terms of what attributes, I "think" this covers OpenGL:
fog = { on/off }
fog_mode = { linear, exp, exp2 }
fog_color = { r,g,b,a }
fog_density = density
fog_distance = { min, max }
fog_hint = { dont_care, nicest, fastest }
Which begs the question what would be good defaults in case none of these
except fog on/off are specified.
Randy
--
Randall Hopper (mailto:[EMAIL PROTECTED])
Lockheed Martin Operation Support
EPA Scientific Visualization Center
US EPA N127-01; RTP, NC 27711
