[vtk-developers] vtkfollower performance problem

[Ken Martin]

ForceOpaqueOff is an odd call to make in that spot. If you want to force
the actor to be opaque use ForceOpaqueOn() if you want to force it to be
Transparent use ForceTransparentOn() Maybe you want to be using
ForceTransparentOn() ?

On Tue, Dec 5, 2017 at 9:08 PM, eclipse <irocks0922 at gmail.com> wrote:

>
> Sorry for cross posting.
>
> I uploaded same post StackOverflow, vtk user mailing lis, vtk git issues
> but nobody made an answer for this.
>
> please forgive me.
>
>
> I am trying to add vtkfollower to vtkrenderer for indicating the chosen
> point.
>
> textured vtkfollower is represented correctly, but in the renderer, if I
> look closer (camera comes closer to polydata) it's getting really
> slow(frame drop) and the boundary of image turned into black. I did not set
> the edge line or something might be related.
>
> then, if I move camera far from model its rendering performance is going
> back to normal.
>
> here is the code.
>
> why is this situation happening? Did I something in a wrong way?
>
> `m_SourceFromQrc = vtkSmartPointer::New();
>
>         m_SourceFromQrc->SetQImage(&m_qimageFromQrc);        m_SourceFromQrc->Update();        m_spVTKTexture = vtkSmartPointer<vtkTexture>::New();        m_spVTKTexture->SetInputConnection(m_SourceFromQrc->GetOutputPort());        m_spVTKTexture->Update();        m_spVTKPlane = vtkSmartPointer<vtkPlaneSource>::New();        m_spVTKPlane->SetNormal(0.0, 0.0, 1.0);        m_spVTKTextureMappedPlane = vtkSmartPointer<vtkTextureMapToPlane>::New();        m_spVTKTextureMappedPlane->SetInputConnection(m_spVTKPlane->GetOutputPort());        m_planeDataMapper = vtkSmartPointer<vtkOpenGLPolyDataMapper>::New();        m_planeDataMapper->SetInputConnection(m_spVTKTextureMappedPlane->GetOutputPort());        double followerOriginPoint[3] = { 0.0 };        followerOriginPoint[1] = -1 / 2.0;        m_follower = vtkSmartPointer< vtkFollower>::New();        m_follower->SetOrigin(followerOriginPoint);         m_follower->SetPosition(            pos[0] - followerOriginPoint[0],            pos[1] - followerOriginPoint[1],            pos[2] - followerOriginPoint[2]);        m_follower->SetScale(6);        m_follower->SetMapper(m_planeDataMapper);        m_follower->SetTexture(m_spVTKTexture);        m_follower->SetCamera(getRenderer(m_rendererType)->GetActiveCamera());        m_follower->VisibilityOn();        m_follower->ForceOpaqueOff();        getRenderer(m_rendererType)->AddActor(m_follower);`
>
> If I change this code m_follower->SetTexture(m_spVTKTexture);
>
> into m_follower->GetProperty()->SetTexture(m_spVTKTexture);,
>
> Then, follower rendered properly without performance loss. but
> ForceOpaqueOff()does not work.
>
> I am using VTK 7.0.
>
> And the renderer is vtkrenderer.
>
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-- 
Ken Martin PhD
Distinguished Engineer
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065

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