[vtkusers] Problem with vtkPolyDataMapper

[Bill Lorensen]

It should work as you expect. Something else is going on. Can you post a
small, compilable example that illustrates the problem?

Bill

On Mon, Apr 11, 2011 at 11:18 AM, Pascal Augustin <pascal at rogue-research.com
> wrote:

> Hi,
>
> Let's assume I have two actors with exactly the same shape. To avoid
> creating the vtkPolyData and vtkPolyDataMapper twice, I decided to let both
> actors share the same vtkPolyDataMapper.
>
> vtkSmartPointer<vtkPolyDataMapper> sphereMapper = ...
>
>
> // Sphere
> vtkSmartPointer<vtkActor> sphereActor1 = ...
> sphereActor1->SetMapper(sphereMapper);
>
> // Sphere
> vtkSmartPointer<vtkActor> sphereActor2 = ...
> sphereActor2->SetMapper(sphereMapper);
>
>
> // Cube
> vtkSmartPointer<vtkPolyDataMapper> cubeMapper = ...
> vtkSmartPointer<vtkActor> cubeActor = ...
> cubeActor->SetMapper(cubeMapper);
>
> I was expecting sphereActor1 and sphereActor2 to be displayed as spheres
> while cubeActor would be a cube. Here is what I sometimes get:
>
> sphereActor1 ---> sphere
> sphereActor2 --> sphere
> cubeActor ---> *** sphere***
>
> The cubeActor seems to be using the shereMapper. It has the correct
> position, color, scale, etc. Only the shape is wrong.
>
> I can avoid this problem by doing this:
> sphereMapper->ImmediateModeRenderingOn();
>
> Doing a shallowCopy also seems to prevent that bug from happening:
> vtkSmartPointer<vtkPolyDataMapper> sphereMapper1
> = vtkSmartPointer<vtkPolyDataMapper>::New();
> sphereMapper1->ShallowCopy(sphereMapper);
> sphereActor1->SetMapper(sphereMapper1);
>
> Am I missing something? Can multiple actors safely share the same mapper?
>
> Thanks!
>
> I am using VTK 5.7 on Mac OS X 10.6.7.
>
> ______________________
> Pascal Augustin
> Rogue Research Inc.
> Montreal (Quebec), Canada
> www.rogue-research.com
>
>
>
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