Re: [Meshlab-devel] quadric filters

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

thanks Paolo,
   doesn't the metro tool just compute the hausdorff distance?  the first
paper generates a percentage by taking the values and dividing by the radius
of the bounding box... would it be valid to say a 1% error with one model
would look like it had the same amount of error as another model at 1%?  any
ideas why the first model's reductions I computed the hausdorff distances on
were not monotonically increasing?

imran

On Mon, Aug 4, 2008 at 11:40 PM, Paolo Cignoni <pao...@is...>wrote:

> skunkwerk wrote:
> > i tried the hausdorff distance plugin on a number of models, such as
> > www.akbars.net/20.zip
> > i noticed two issues:
> > 1)  when the model & a copy of itself in another layer are open, the
> quadric
> > texture plugin doesn't seem to reduce models - or at least, the display
> > isn't updated as the model looks exactly the same.
> >
>
> Probably you have simply forgotten to disable the view of one layer that
> occludes the simplified one.
>
> > 2)  the hausdorff distance doesn't really tell you a lot - on one model,
> i
> > got the following results after a series of 6 reductions:
> >
> > 0.001267
> > 0.012462
> > 0.035062
> > 0.040926
> > 0.036652
> > 0.027046
> >
> > while on the model mentioned above (20.zip) i got the following:
> > .99
> > 1.7
> > 4.7
> > 8.8
> > 11.9
> > 14
> > 14.4
> > 15.3
> > 15.3
> >
> > how can you get some sense of the "quality" of the reduction from looking
> at
> > these numbers?  any ideas?
> >
> Read these papers. accurately.
> http://vcg.isti.cnr.it/publications/papers/metro.pdf
> http://citeseer.ist.psu.edu/cignoni97comparison.html
>
>
> --
> Paolo Cignoni  -- Senior Researcher
> Visual Computing Laboratory - ISTI - CNR
> http://vcg.isti.cnr.it/~cignoni <http://vcg.isti.cnr.it/%7Ecignoni>
>
> ISTI - CNR
> Via Moruzzi 1,
> 56124 Pisa
> ITALY
>
>
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