Re: [Meshlab-devel] quadric filters

[skunkwerk <sku...@gm...>]

thank you Paolo,

1)  i don't know what i was doing wrong before, but I tried the layers
again, and it worked fine.  the hausdorff distance plugin gave me the
following output when I ran it on 2 identical meshes:
max:65, mean:0.026, RMS:0.99
doing more samples would likely bring these values closer to 0, right?...
would the best way to interpret these values be to compare them to the
radius of the mesh's bounding box?

2)  i tried the minerva ply file on a fresh checkout of meshlab, and it
froze my whole machine - so yes, it'd be good if someone else could try this
out

3)  they're some comments in Italian as well inside refine.h, i'll wait for
your update

4)  my question about finding the number of "leaves" was in relation to the
discussion of the model here: www.akbars.net/27.zip
to which you said: "one of the tree has approx 26k faces in the leaves. All
the leaves has no internal vertex..."

5)  it seems like the 'border' in meshlab is the border of a simplicial
complex... when I thought of boundary I was thinking of the outermost faces
of a model.  but i guess the real issue is that simplification with
'preserve borders' sometimes works well, and sometimes not - and i'm trying
to figure out a way to figure out when to use it

regards,
imran

On Mon, Aug 4, 2008 at 2:31 PM, Paolo Cignoni <pao...@is...>wrote:

>  skunkwerk wrote:
>
> thanks Paolo,
>    it's nice to have you back.  i didn't feel the wiki page answered my
> questions:
> 1)  what's the definition of a border & boundary within meshlab, and are all
> non-manifold faces bordering faces?
>
>
>  I have tried to improve the doc.
>
>
> http://vcg.sourceforge.net/index.php/Tutorial#Boundary_relations_and_adjacency
>
> It is nice to have someone that actually tests our scarce documentation :)
>
>
>  2)  do the number of leaves correspond to the number of border faces, or
> what?
>
>
>  I have not understood what do you mean with leaves? what leaves? what tree
> are you referring to? I have lost the context.
>
>  while these are from other threads, i don't want to send 5 emails to the
> list:
> 3)  the same file you sent me to test on the texture filter froze my entire
> machine & meshlab - did you not encounter any issues with it?  was it not
> working with the 'copied tiles' option or with 'resampled'?
>
>
>  yes it does not works with your filter.  It is a typical dirty mesh
> against which algorithms should be made robust.
> (the mesh we are talking about is the old textured minerva 250 face and two
> textures)
>
> 4)  i tried loading 2 layers into meshlab to use with the hausdorff distance
> plugin, but i don't think the layers are working.  any suggestions?
>
>
>  I have tried on different architecture and layers seems to be correctly
> working.
> Can some one be able to replicate this issue?
>
> 5)  trying to clip triangles with refine.h: you said i need to define which
> edges of the triangle need to be split - but how do I define the points it
> should be split at?  i tried doing a search for 'subdivision' in the
> codebase but couldn't find much - could someone point me to the specific
> file that does some clipping?
>
>
>  I will expand the comment in the refine.h file
> look for the next commits.
> p.
>
>
>  regards,
> imran
>
> On Sun, Aug 3, 2008 at 1:26 AM, Paolo Cignoni <pao...@is...> <pao...@is...>wrote:
>
>
>
>  skunkwerk wrote:
>
>
>  Paolo, may I ask how you determined the number of leaves in the model?
>
>
>   The
>
>
>  .dae had a maximum of 2,766 triangles in one "node"
>
> sorry for all the questions
>
> imran
>
> On Mon, Jul 21, 2008 at 6:10 AM, Paolo Cignoni <
>
>
>  pao...@is...>wrote:
>
>
> I have added some notes on the border flags in the vcg wikihttp://vcg.sourceforge.net/index.php/Flags
> p.
>
>
>
> --
> Paolo Cignoni  -- Senior Researcher
> Visual Computing Laboratory - ISTI - CNR
> http://vcg.isti.cnr.it/~cignoni <http://vcg.isti.cnr.it/%7Ecignoni> <http://vcg.isti.cnr.it/%7Ecignoni> <http://vcg.isti.cnr.it/%7Ecignoni>
>
> ISTI - CNR
> Via Moruzzi 1,
> 56124 Pisa
> ITALY
>
>
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> --
> Paolo Cignoni  -- Senior Researcher
> Visual Computing Laboratory - ISTI - CNR http://vcg.isti.cnr.it/~cignoni <http://vcg.isti.cnr.it/%7Ecignoni>
>
> ISTI - CNR
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> 56124 Pisa
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