Re: Workaround for this bug?

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

On Fri, 21 Jan 2005, James W. Walker wrote:

> On Jan 21, 2005, at 12:10 AM, Keith Wiley wrote:
>
>> 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?
>
> Why not use a disk instead of a square for the sun?

The only reason I used a square was to reduce the number of triangles.  I 
considered a circle and thought it was "bad desig" to make shapes with 
triangles that could be made with transparent textures instead.  I'll try 
it with a disk...although I would still like the alpha texture to work 
properly if I want the sun to have a fuzzy edge.  A round disk doesn't 
really help with that problem.  A sun disk with a hard edge doesn't look 
very realistic...but I understand that's a sacrifice I might have to make. 
Thanks for the tip on the circular disk.

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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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