[vtk-developers] vtkfollower performance problem

[eclipse]

First of all, Thanks for Reply.

I want to make vtkfollower come to front regardless of any other polydata.

Whether or not I move camera position, vtkollower should be rendered.

  camera  -  vtkfolllower - actor of other polydatas.






2017-12-08 23:50 GMT+09:00 Ken Martin <ken.martin at kitware.com>:

> 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.
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