Re: [Algorithms] VIPM and UV texturing

[Mark W. <mwa...@to...>]

Thanks one and all for your contributions, things are infinitely clearer now
...

Mark

----- Original Message -----
From: "Charles Bloom" <cb...@cb...>
To: <gda...@li...>
Sent: Thursday, August 10, 2000 4:15 AM
Subject: Re: [Algorithms] VIPM and UV texturing


>
> 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
>
>
> _______________________________________________
> GDAlgorithms-list mailing list
> GDA...@li...
> http://lists.sourceforge.net/mailman/listinfo/gdalgorithms-list