Steve Baker (sbaker++at++link.com)
Wed, 19 Nov 1997 13:14:12 -0600 (CST)
> Just wondering if any one knew how to clean up the edges of tree
> models..
>
> I have a T tree model with a rgba image applied. BUT at a distance away
> the tree gets a white border around it making it look real bad...
When you paint a texture map, you have to appreciate that
MIP mapping will gradually blend together more and more of
the texels as the range and/or slope increases.
In the case of an '.inta' or '.rgba' map, this will cause two
bad things to happen:
1) The pixels that you though would be clipped out by the
transparency will gradually become semi-transparent, and
hence you will start to see parts of the image that you
thought you had thrown away.
2) The areas outside of the opaque region will gradually
get mixed into the visible part.
The simplest solution is to paint the areas of the RGB map
that are transparent with colours similar to those found
in the tree itself.
In addition, I build my own MIP-maps (rather than letting
Performer/OpenGL do it for me) so that I can control the
contents of the lower level of detail maps. This is essential
IMHO if you are going to make significant use of translucent
textures.
Steve Baker 817-619-8776 (Vox/Vox-Mail)
Hughes Training Inc. 817-619-4028 (Fax)
2200 Arlington Downs Road SBaker++at++link.com (eMail)
Arlington, Texas. TX 76005-6171 SJBaker1++at++airmail.net (Personal eMail)
http://www.hti.com http://web2.airmail.net/sjbaker1 (personal)
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