serious texture mapping bug in current code

[Joseph J. S. <jo...@st...>]

I've just noticed a serious bug in texture-mapping with a build of 
Quesa I did from the CVS sources on June 1st.  It shows up in a level 
editor, where there is a floor textured with a grid.  The floor is a 
TriMesh with two triangles, with a simple grid texture, and looks 
like this in 1.6d18 and before:

	<http://www.strout.net/temp/texmap-d18.png>

(Please excuse the low contrast.)  But under my June 1st build, it 
looks like this:

	<http://www.strout.net/temp/texmap-d19.png>

When I move the camera so that the triangle normals are pointing 
directly out of the screen, the mapping is correct.  It looks to me 
as if the UV interpolation is happening after the triangles are 
projected to the screen, rather than happening in world coordinates, 
so the perspective on the texture is all screwed up.

Known issue, or unpleasant surprise?  I searched the bug tracker and 
didn't find anything, but then, I don't trust my searching skills 
with that yet.

(Jos=E9: I strongly recommend we *don't* pack up a 1.6d19 distribution 
for general consumption yet; we need to nail down any new bugs first, 
like this one and perhaps others, so that updating doesn't turn out 
to be a step backwards for end-users.)

Thanks,
- Joe

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