Re: [Meshlab-devel] quadric filters

[Marco P. <pi...@gm...>]

so i actually implemented it.

Then i think i just did copy and paste from the regular one, because i
do not remember doing anything special.

I don't know why their outcome differs so much.

On 7/16/08, skunkwerk <sku...@gm...> wrote:
> thanks Marco,
>        Paolo, is this feature something we could ask Marco to implement?  I
> re-did my tests, restarting meshlab each time so as not to be affected by
> the bug you mentioned.  the 'preserve boundary' option does seem to work,
> but even without it selected the regular quadric preserves much more of the
> boundary than the quadric-with-texture does.
>
> i'm working on fixing the filter texture (texture atlas) plugin right now
>
> imran
>
> On Wed, Jul 16, 2008 at 1:55 PM, Marco Pirosu <pi...@gm...> wrote:
>
>> the original quadric algorithm has been written by paolo cignoni. I
>> think to remember i did not manage it because it wasn't part of the
>> course project, even if the option is there (i think it has been put
>> there in order to be uniform with the normal one). Also, if i remember
>> well. the two algotithms work in a different way. The regular one is
>> dedicated for 3D geometry, while my algorithm is based on the Garland
>> multidimensional algorithm.
>>
>>
>> On 7/16/08, skunkwerk <sku...@gm...> wrote:
>> > it looks like the extra options in the regular quadric filter make no
>> > visible difference (i tried reductions with them on and off) -
>> > especially
>> > the 'preserve boundaries' option that I thought would account for the
>> > different performance.
>> >
>> > but sure enough, the regular-quadric is performing better (dropping less
>> > geometry for the same number of output faces) than the quadric-texture
>> > filter.  any ideas why?
>> >
>> > imran
>> >
>> > On Wed, Jul 16, 2008 at 9:55 AM, skunkwerk <sku...@gm...> wrote:
>> >
>> >> is that the source of the problem, you think?
>> >> who wrote the regular quadric filter?
>> >> would it be possible to copy-paste the code from the regular quadric
>> >> filter
>> >> that handles boundary preservation to the quadric-texture one?
>> >>
>> >> imran
>> >>
>> >>
>> >> On Wed, Jul 16, 2008 at 4:19 AM, Marco Pirosu <pi...@gm...> wrote:
>> >>
>> >>> i think it wasn't part of the course project, so i didn't implement
>> >>> it.
>> >>> It
>> >>> should be doable, through.
>> >>>
>> >>> On 7/16/08, skunkwerk <sku...@gm...> wrote:
>> >>>
>> >>>> there seems to be a difference in the performance of the
>> >>>> quadric-with-texture filter and the regular quadric.
>> >>>>
>> >>>> see these two files:
>> >>>> www.akbars.net/classicford.saved.dae (regular quadric)
>> >>>> www.akbars.net/classicford.savedtextured.dae (quadric-with-texture)
>> >>>>
>> >>>> the quadric-with-texture file has polygons missing from the wheels,
>> >>>> if
>> >>>> you look at them from the side.  is this supposed to happen?  they
>> were
>> >>>> both
>> >>>> reduced to about ~50,000 polygons.
>> >>>>
>> >>>> Is there a reason the quadric-with-texture filter doesn't have a
>> >>>> "preserve boundary" option?
>> >>>>
>> >>>> thanks,
>> >>>> imran
>> >>>>
>> >>>>
>> >>>>
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