Here is a c172 model file that I've adjusted and seems to look much better
in terms of the "z fighting".  It won't be going into cvs since it was done to
a converted copy, not the original blender file.

http://www.spiderbark.com/fgfs/c172-dpm.ac.gz

As I experimented with this model what I found is that the order the objects 
are rendered makes a big difference in what you see.  This seems to make
sense. If there is depth contention going on,  the objects rendered last will
overlay the previous objects.  Of course what the ideal order is changes
depending on the angle from which you view the model.

How this works is probably just a little bit more complex, but you can see
what difference it made with the attached file.   This is making me wonder
about the value of developing a system for resorting aircraft objects (or
groups of objects in an aircraft model) on the fly depending on viewing angle.
 For example: you may want to change the order relationship between the
fuselage and wings on the cessna depending on whether you are looking down at
it or up at it.

As you know, I'm learning as I go here, so comments from OpenGL experts would
be greatly appreciated!

Best,

Jim



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