[vtkusers] Infinite sea plane - what's the best way?

Tue Apr 10 15:15:45 EDT 2018

Probably add it as a mode in the vtkSkybox class. Implementation in
vtkOpenGLSkybox just have to change a small bit of shader logic there to
compute a texture coordinate for a floor as opposed to a skybox or a
photosphere.

On Tue, Apr 10, 2018 at 2:19 PM, David E DeMarle <dave.demarle at kitware.com>
wrote:

> On Tuesday, April 10, 2018, 2:05:15 PM GMT+12, Jesse Kinross-Smith <
>> Jesse.Kinross-Smith at bentley.com> wrote:
>>
>> So I need to create an infinite textured plane to represent the sea.
>>
>> vtkPlaneSource seems like the right object, but I can’t seem to get any
>> of the examples to display anything.
>>
>> A colleague tried a while back also but said he could only get it to work
>> with OpenGL not OpenGL2.
>>
>>
> That is odd. OpenGL2 has been the default for a while now and it is tested
> nightly on many platforms. Need more information about what is specifically
> going wrong to diagnose what is wrong in your setup.
>
>
>> Anyone able to offer any ideas?
>>
>> I’ve got a rectilinear grid working, but it’s not ideal, really need an
>> infinite textured plane.
>>
>>
>>
> VTK doesn't really have the concept of boundless shapes to my knowledge.
>
> It is very likely you could do this with OpenGL2 and programmable shaders.
> The shader(s) would evaluate the plane equation, determine a depth and u/v
> coordinate for each fragment and then reject or pass and color the fragment
> based on the depth test. vtkOSPRay would have a different implementation.
>
> Using VTK 8.1.0, C++
>>
>>
>>
>> void CModelView::vtkRenderImageToPlane(const CString& inputFilename,
>> float x, float y, float z)
>>
>> {
>>
>>        USES_CONVERSION;
>>
>>        std::string filename = W2A(inputFilename);
>>
>>
>>
>>        // Read the image which will be the texture,
>>
>>        Image_Type imageType = GetImageType(inputFilename);
>>
>>        vtkAlgorithmOutput* ImageOutput = NULL;
>>
>>        vtkSmartPointer<vtkPNGReader> pNGReader = NULL;
>>
>>        vtkSmartPointer<vtkJPEGReader> jPEGReader = NULL;
>>
>>        vtkSmartPointer<vtkBMPReader> bMPReader = NULL;
>>
>>        switch (imageType)
>>
>>        {
>>
>>               case Image_Type::PNG:
>>
>>               {
>>
>>                       pNGReader = vtkSmartPointer<vtkPNGReader>::New();
>>
>>                       pNGReader->SetFileName(filename.c_str());
>>
>>                       pNGReader->Update();
>>
>>                       ImageOutput = pNGReader->GetOutputPort();
>>
>>               }
>>
>>               break;
>>
>>               case Image_Type::JPG:
>>
>>               {
>>
>>                       jPEGReader = vtkSmartPointer<vtkJPEGReader>::New();
>>
>>                       jPEGReader->SetFileName(filename.c_str());
>>
>>                       jPEGReader->Update();
>>
>>                       ImageOutput = jPEGReader->GetOutputPort();
>>
>>               }
>>
>>               break;
>>
>>               case Image_Type::BMP:
>>
>>               {
>>
>>                       bMPReader = vtkSmartPointer<vtkBMPReader>::New();
>>
>>                       bMPReader->SetFileName(filename.c_str());
>>
>>                       bMPReader->Update();
>>
>>                       ImageOutput = bMPReader->GetOutputPort();
>>
>>               }
>>
>>               break;
>>
>>        }
>>
>>        if (ImageOutput == NULL || (pNGReader == NULL && jPEGReader ==
>> NULL && bMPReader == NULL))
>>
>>               return;
>>
>>
>>
>>        // Create a plane
>>
>>        vtkSmartPointer<vtkPlaneSource> plane = vtkSmartPointer<
>> vtkPlaneSource>::New();
>>
>>        plane->SetNormal(0.0, 0.0, 1.0);
>>
>>        plane->SetCenter(0, 0, 0);
>>
>>        //plane->SetResolution(100, 100);
>>
>>        //plane->SetPoint1(100000, -100000, 0);
>>
>>        //plane->SetPoint2(-100000, 100000, 0);
>>
>>
>>
>>        // Apply the texture
>>
>>        vtkSmartPointer<vtkTexture> texture = vtkSmartPointer<vtkTexture
>> >::New();
>>
>>        texture->SetInputConnection(ImageOutput);
>>
>>        texture->InterpolateOn();
>>
>>        texture->RepeatOn();
>>
>>
>>
>>        vtkSmartPointer<vtkTextureMapToPlane> texturePlane =
>> vtkSmartPointer<vtkTextureMapToPlane>::New();
>>
>>        texturePlane->SetInputConnection(plane->GetOutputPort());
>>
>>
>>
>>        vtkSmartPointer<vtkPolyDataMapper> planeMapper = vtkSmartPointer<
>> vtkPolyDataMapper>::New();
>>
>>        planeMapper->SetInputConnection(texturePlane->GetOutputPort());
>>
>>
>>
>>        vtkSmartPointer<vtkActor> texturedPlane = vtkSmartPointer<vtkActor
>> >::New();
>>
>>        texturedPlane->SetMapper(planeMapper);
>>
>>        texturedPlane->SetTexture(texture);
>>
>>        texturedPlane->GetProperty()->SetOpacity(0.7);
>>
>>        texturedPlane->SetPickable(FALSE);
>>
>>
>>
>>        // Visualize the textured plane
>>
>>        m_vtkRenderer->AddActor(texturedPlane);
>>
>>
>>
>> }
>>
>>
>>
>> --
>>
>> Jesse Kinross-Smith
>>
>> Senior Software Engineer - BSW
>>
>> Bentley Systems, Fremantle
>>
>>
>> _______________________________________________
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>> _______________________________________________
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>>
>> Visit other Kitware open-source projects at
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>>
>> Please keep messages on-topic and check the VTK FAQ at:
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>>
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>
> _______________________________________________
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>
> Please keep messages on-topic and check the VTK FAQ at:
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>
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-- 
Ken Martin PhD
Distinguished Engineer
Kitware Inc.
101 East Weaver Street
Carrboro, North Carolina
27510 USA

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