[vtkusers] updating vtkPolyData

[Amy Squillacote]

Paul,

Did you try calling "Render" after you updated your dataset?

- Amy

Paul Harris wrote:
> Hi all,
>
> This is hopefully a silly question, but how do I "push though" changes 
> made on a vtkPolyData object?
>
> In context, I have a pipeline set up with a vtkPolyData object 
> attached to a mapper which renders to a QVtkWidget.
>
> I want to update the contents of that object like so...
> vtkPolyData * dataSet = the_pipeline_instance;
>
>       dataSet->Reset();
>       dataSet->SetPoints(points.get());
>       dataSet->SetVerts(verts.get());
>       dataSet->GetPointData()->AddArray(sizes.get());
>       dataSet->GetPointData()->AddArray(colours.get());
>
> where points, verts, sizes, colours are all set up prior.
>
> Then I tried to do
> dataSet->Modified();
> and even
> dataSet->Update();
>
> but the rendered image did not change... until i rotated the model.
>
> Do I have to call Update() on the renderer, or the mapper, or the 
> QVtkWidget ?  Doesn't Modified() notify the filters upstream that 
> something has changed ?
>
>
> and a secondary question, I am using Reset() above, but it mentions 
> that it does not free memory...
> Is there another way I should be replacing the contents of my data 
> object ?
>
> thanks,
> Paul
>
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-- 
Amy Squillacote                    Phone: (256) 726-4839
Computer Scientist                 Fax: (256) 726-4806
CFD Research Corporation           Web: http://www.cfdrc.com
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Huntsville, AL  35805