Jim Wilson writes:
> > 
> 
> As far as the reason the existing alpha-blend code doesn't work may be related
> to an update in 1.8.4 that was described in ChangeLog as "smaller and cleaner
> scene graphs".  That's just a WAG,  but it seems that this function would be
> better accomplished through an API rather than writing directly back to
> scenegraph memory from SimGear anyway (I find it mildly irritating that you
> can even do that :-/).

My guess is that you aren't following the rules :-)
http://www.opengl.org/resources/tutorials/advanced/advanced97/notes/node111.html

Norman

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