[vtkusers] Fwd: VTK is completely Slow

Wed Jul 20 09:40:35 EDT 2011

Hi Stephane,

I'll try and send you a feedback.

Thank you in Advance

On Wed, Jul 20, 2011 at 5:48 AM, Stephane PLOIX <stephane.ploix at edf.fr>wrote:

>
> Hi,
>
> You could use the vtkMultiBlockDataSet structure with one block per object
> (look at the vtkMultiBlockMergeFilter to merge your objects into one
> vtkMultiBlockDataSet ).
> You will then have only one actor per  vtkMultiBlockDataSet, which can
> speed up your rendering.
> You can still individually select one block from a multiblock.
>
> Stephane
>
>       *Stephane PLOIX**
> Pilote Opérationnel - Visualisation scientifique*
> EDF - R&D
> SINETICS
> 1, Av du Général de Gaulle
> 92140 Clamart
>
> *stephane.ploix at edf.fr*
> Tél. : +33 (0) 1 47 65 51 10   Un geste simple pour l'environnement,
> n'imprimez ce message que si vous en avez l'utilité.
>
>
>
>  *tmacedo29 at gmail.com*
> Envoyé par : vtkusers-bounces at vtk.org
>
> 19/07/2011 21:10
>   A
> daviddoria at gmail.com
> cc
> vtkusers at vtk.org
> Objet
> Re: [vtkusers] Fwd: VTK is completely Slow
>
>
>
>
> Hi David,
>
> Would it make impossible to select each 3D entity? I mean, now I'm
> able to select a cylinder and not all the objects.
> Using just one mapper/actor will I be able to keep this selection?
>
> Regards
>
> On Tue, Jul 19, 2011 at 3:18 PM, David Doria <daviddoria at gmail.com> wrote:
> > On Tue, Jul 19, 2011 at 2:15 PM, Thiago Macedo <tmacedo29 at gmail.com>
> wrote:
> >> Hi,
> >>
> >> I'm developing a CAD based software. At some point, the
> >> app converts the 2D drawing into a 3D huge scene.
> >> The main problem is: It's very slow!
> >> I'm not using any complex algorithm neither complex structure. The
> >> 'translation' between 2D and 3D is very fast, and creates basic
> >> geometries. E.g..:
> >> A hydraulic tube is converted into a cylinder (vtkCylinderSource), the
> >> connection between 2 hydraulic tubes is a sphere (vtkSphereSource);
> >> A 2D line is converted into a 3D line (vtkLine)
> >> All of 3D entities has a mapper and an actor.
> >> I'm working with a lot of (closer than million) 2D entities, and the
> >> 3D scene is totally slow.
> >> I've tried to use all tips wrote in the wiki (
> >> http://www.vtk.org/Wiki/VTK/FAQ - How to handle large data sets in VTK
> >> ) and I have just a little improvement.
> >> I searched into the books (v5) and was not able to find anything to
> >> help me. I think it should be faster if I use simple structures like
> >> cylinders and lines like I'm doing.
> >> Is there a way to make it faster?
> >>
> >> Thank you in Advance
> >> Best Regards
> >>
> >> --
> >> Thiago B. Macedo
> >
> > "All of 3D entities has a mapper and an actor."
> >
> > I think that may be your problem. I would try useing the AppendFilter
> > (http://www.vtk.org/Wiki/VTK/Examples/Cxx/Filters/AppendFilter) to
> > create a single data set that you can create a single mapper/actor
> > from.
> >
> > See if that help and let us know.
> >
> > David
> >
>
>
>
> --
> Thiago B. Macedo
>
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-- 
Thiago B. Macedo

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