Caching with custom elements

[James W. <ja...@fr...>]

In the renderers, I'm using a custom element to cache an optimized 
version of a TriMesh.  The element contains an edit index along with the 
TriMesh reference, so that a stale cache can be detected.  That works 
fine in principle, though there's a bug at the moment.

But now suppose I have another similar custom element, say to cache a 
triangle strip.  When I update the triangle strip, it bumps the edit 
index, so the other cache becomes stale.  Which causes the other cache 
to get updated, bumping the edit index, which makes the triangle cache 
stale...

How can I get out of this infinite loop?  The simplest way, I suppose, 
would be to add a Q3Shared_SetEditIndex function, and use it when 
setting these cache elements. Is there a more elegant way I haven't 
thought of?
-- 
   James W. Walker, Innoventive Software LLC
   <http://www.frameforge3d.com/>