[vtk-developers] possible bug in vtk 7.1 - OpenGL2

[Ken Martin]

Yes, I suspect the class needs to be fixed. If you have a VTK build you can
try editing vtkFollower.cxx to include the following line

  this->Device->SetTexture(this->GetTexture());

around line number 272 (right before the ComputeMatrix call)

if that works I can put in a fix

Ken

On Fri, Aug 12, 2016 at 1:37 PM, Roberto Gori <r.gori at cineca.it> wrote:

> Hi,
>
> thx for your answer [image: Sorriso]
>
> you are right but the result is the same.
>
> it works using a vtkActor instead of a vtkFollower.
>
> *From:* Ken Martin <ken.martin at kitware.com>
> *Sent:* Friday, August 12, 2016 7:02 PM
> *To:* Roberto Gori <r.gori at cineca.it>
> *Cc:* VTK Developers <vtk-developers at vtk.org>
> *Subject:* Re: [vtk-developers] possible bug in vtk 7.1 - OpenGL2
>
> What happens if you remove the TextureMapToPlane? PlaneSource generates
> texture coordinate by default. So connect that directly to the mapper and
> what happens?
>
> On Fri, Aug 12, 2016 at 12:21 PM, Roberto Gori <r.gori at cineca.it> wrote:
>
>> Hi,
>>
>> sorry for cross-posting but no one is answering to my question on the
>> vtkusers list.
>>
>> As you can see running this code the plane is visualized without texture.
>>
>> I think the problem is in rendering a texture on a vtkFollower.
>> Can someone open a bug on Mantis?
>>
>>
>> #include <vtkImageData.h>
>> #include <vtkJPEGReader.h>
>> #include <vtkPolyDataMapper.h>
>> #include <vtkPolyData.h>
>> #include <vtkSmartPointer.h>
>> #include <vtkTextureMapToPlane.h>
>> #include <vtkPlaneSource.h>
>> #include <vtkTexture.h>
>> #include <vtkRenderer.h>
>> #include <vtkRenderWindow.h>
>> #include <vtkRenderWindowInteractor.h>
>> #include <vtkFollower.h>
>> #include <vtkVersion.h>
>>
>> int main ( int argc, char *argv[] )
>> {
>> // Parse command line arguments
>> if ( argc != 2 )
>> {
>> std::cerr << "Usage: " << argv[0] << " Filename" << std::endl;
>> return EXIT_FAILURE;
>> }
>>
>> std::cout << "VTK version:" << vtkVersion::GetVTKVersion() << std::endl;
>>
>> std::string inputFilename = argv[1];
>>
>> // Read the image which will be the texture
>> vtkSmartPointer<vtkJPEGReader> jPEGReader =
>> vtkSmartPointer<vtkJPEGReader>::New();
>> jPEGReader->SetFileName ( inputFilename.c_str() );
>>
>> // Create a plane
>> vtkSmartPointer<vtkPlaneSource> plane =
>> vtkSmartPointer<vtkPlaneSource>::New();
>> plane->SetCenter(0.0, 0.0, 0.0);
>> plane->SetNormal(0.0, 0.0, 1.0);
>>
>> // Apply the texture
>> vtkSmartPointer<vtkTexture> texture =
>> vtkSmartPointer<vtkTexture>::New();
>> texture->SetInputConnection(jPEGReader->GetOutputPort());
>>
>> vtkSmartPointer<vtkTextureMapToPlane> texturePlane =
>> vtkSmartPointer<vtkTextureMapToPlane>::New();
>> texturePlane->SetInputConnection(plane->GetOutputPort());
>>
>> vtkSmartPointer<vtkPolyDataMapper> planeMapper =
>> vtkSmartPointer<vtkPolyDataMapper>::New();
>> planeMapper->SetInputConnection(texturePlane->GetOutputPort());
>>
>> vtkSmartPointer<vtkFollower> texturedPlane =
>> vtkSmartPointer<vtkFollower>::New();
>> texturedPlane->SetMapper(planeMapper);
>> texturedPlane->SetTexture(texture);
>>
>>
>> // Visualize the textured plane
>> vtkSmartPointer<vtkRenderer> renderer =
>> vtkSmartPointer<vtkRenderer>::New();
>> renderer->AddActor(texturedPlane);
>>
>> renderer->SetBackground(.1, .2, .3); // Background color dark blue
>> renderer->ResetCamera();
>>
>> texturedPlane->SetCamera(renderer->GetActiveCamera());
>>
>>
>> vtkSmartPointer<vtkRenderWindow> renderWindow =
>> vtkSmartPointer<vtkRenderWindow>::New();
>> renderWindow->AddRenderer(renderer);
>>
>> vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
>> vtkSmartPointer<vtkRenderWindowInteractor>::New();
>> renderWindowInteractor->SetRenderWindow(renderWindow);
>>
>> renderWindow->Render();
>>
>> renderWindowInteractor->Start();
>>
>> return EXIT_SUCCESS;
>> }
>>
>>
>>
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>
>
> --
> Ken Martin PhD
> Chairman & CFO
> Kitware Inc.
> 28 Corporate Drive
> Clifton Park NY 12065
> 518 371 3971
>
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-- 
Ken Martin PhD
Chairman & CFO
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065
518 371 3971

This communication, including all attachments, contains confidential and
legally privileged information, and it is intended only for the use of the
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action taken in reliance on it is prohibited and may be unlawful. If you
received this communication in error please notify us immediately and
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