Re: [Algorithms] VIPM and UV texturing

[Charles B. <cb...@cb...>]

Hi Jeff,

really, you should be including UV's and RGB's and Normals as 
part of the quadric error metric, so that this kind of thing
should be detected automagically, and should be put late in
the collapse list by the system.  I've found that if you
use a proper (eg. comprehensive and robust) error metric,
then almost zero artist intervention is necessary.  In fact,
I find that the system is generally much better at ordering
collapses than artists are.  Of course, there are exceptions,
which usually occur because of the fact that I'm not actually
looking in the texture bits; eg. changing the uv's slightly
in a region of the texture which is very high frequency
produces much more visual error than if you change the uv's in
a very low frequency region of the texture.  To handle this
correctly, you do need some sort of artist cue, as you propose.
I like Tom's method of reducing to a specific mesh.

At 10:06 AM 8/9/2000 -0700, you wrote:
>Now the problem as you would guess is you have the face with coordinates
like (1,0) -----  (0,0) ---- (1,0).  Obviously more granular then that.
There are no texture coordinate discontinuities so the algorithm says it is
ok.  The surface of the face is roughly flat so the internal vertex and
edges are good candidates for collapse.  However, you then get the nice
situation of  (1,0) ------ (1,0).  Doesn't look so hot.  I have the artists
tag reflected seam vertices as uncollapsable until very late in the order.>
--------------------------------------
Charles Bloom           www.cbloom.com