Workaround for this bug?

[Keith W. <kw...@cs...>]

I am trying to use an alpha channel to make a soft sun that fades into 
the background sky.  It works perfectly except at the horizon, where the 
square shape of the plane the sun texture is put on shows up as a 
translucent square.  This problem vanishes if I turn off fog.  I am 
aware of the discussions pointing out that fog does not work properly 
with alpha channeled textures...and I assume you will agree that this 
bug is the problem I am experiencing.  My question is, does anyone havea 
reccomendation for how to work around it?

Incidently, if I make the texture "transparent" instead of alphaed it 
works just fine, the square background is invisible.  The transparent 
texture is made by toggling transparency instead of alpha in Meshwork.  
This confuses me because I assumed up until now that there is no such 
thing as "transparency" in Quesa, and that what Meshwork is really doing 
is simply constructing an alpha channel that is only black and white and 
applying that to the texture in question...but since Meshwork-made 
transparent textures work properly with fog and alpha channel textures 
do not, I am not wondering if transparency is actually something other 
than 1-bit alpha.

Am I wrong in my assumption about how transparency is working?

Thanks.


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Keith Wiley         kw...@cs...         http://www.unm.edu/~keithw

"Yet mark his perfect self-contentment, and hence learn his lesson,
that to be self-contented is to be vile and ignorant, and that to
aspire is better than to be blindly and impotently happy."
                                           --  Edwin A. Abbott, Flatland
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