[vtkusers] Re : Re : Re : Re : vtkMultiBlockDataSet and SetInputConnection

[R M]

Just to have some advices,  what is the best solution to color each block of the multiblockDataSet if using the CompositeDataGeometryFilter.
Should I create for each block a new cell array that contains the id of the block ?
Like this, when doing the rendering, I can color each block of the resulting vtkPolyData of the CompositeDataGeometryFilter by using this array. 

May be there is a better solution ?

Thank you.


________________________________
De : R M <mlokida at yahoo.fr>
À : Favre Jean <jfavre at cscs.ch>; "vtkusers at vtk.org" <vtkusers at vtk.org>
Envoyé le : Jeudi 6 Octobre 2011 11h11
Objet : [vtkusers] Re : Re : Re : vtkMultiBlockDataSet and SetInputConnection


Oups, I think I have a mistake. CompositeDataGeometryFilter only give one polyData. So only one mapper and one actor.
But, If I want to color my blocks by different color, I can't use CompositeDataGeometryFilter. I have to build one mapper/actor for each block.




________________________________
De : R M <mlokida at yahoo.fr>
À : Favre Jean <jfavre at cscs.ch>; "vtkusers at vtk.org" <vtkusers at vtk.org>
Envoyé le : Jeudi 6 Octobre 2011 11h06
Objet : [vtkusers] Re : Re :  vtkMultiBlockDataSet and SetInputConnection


Ok now I can see the idea :)

So if I have understand, you have: multiblockDataSet-> ExtractBlock -> CompositeDataGeometryFilter -> Mapper for the N blocs we have extracted -> Actors for the N Mappers -> Renderer

Thank you.



________________________________
De : Favre  Jean <jfavre at cscs.ch>
À : R M <mlokida at yahoo.fr>; "vtkusers at vtk.org" <vtkusers at vtk.org>
Envoyé le : Jeudi 6 Octobre 2011 9h29
Objet : RE: Re : [vtkusers] vtkMultiBlockDataSet and SetInputConnection

I use a vtkExtractBlock upstream, to do selection on a per-block basis. The output of vtkExtractBlock is itself a multi-block dataset and the rest of the pipeline is unchanged.

J
________________________________
From: R M [mlokida at yahoo.fr]
Sent: Thursday, October 06, 2011 9:24 AM
To: Favre Jean; vtkusers at vtk.org
Subject: Re : [vtkusers] vtkMultiBlockDataSet and SetInputConnection

Hi,

I had seen the vtkCompositeDataGeometryFilter but, the problem in my case, is that the ouput is one polydata (so one polydatamapper and one actor). And, I want the option to make
 visible or not one of the block on my geometry. That 's why I
 haven't use vtkCompositeDataGeometryFilter.

Thank you.

________________________________
De : Favre Jean <jfavre at cscs.ch>
À : "vtkusers at vtk.org" <vtkusers at vtk.org>
Envoyé le : Jeudi 6 Octobre 2011 9h06
Objet : Re: [vtkusers] vtkMultiBlockDataSet and SetInputConnection

Here is what I have been using for several years.

eb1 is my multi-block dataset.

VTK_CREATE(vtkCompositeDataGeometryFilter, geom1);
geom1->SetInputConnection(0, eb1->GetOutputPort(0));
geom1->Update();

VTK_CREATE(vtkPolyDataMapper,
 mapper1);
mapper1->SetInputConnection(geom1->GetOutputPort(0));

VTK_CREATE(vtkActor,
 actor1);
actor1->SetMapper(mapper1);

-----------------
Jean M. Favre
Swiss National Supercomputing Center


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