VtkToPng.cpp 5.32 KB
Newer Older
Chris Cantwell's avatar
Chris Cantwell committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
///////////////////////////////////////////////////////////////////////////////
//
// File VtkToPng.cpp
//
// For more information, please see: http://www.nektar.info
//
// The MIT License
//
// Copyright (c) 2006 Division of Applied Mathematics, Brown University (USA),
// Department of Aeronautics, Imperial College London (UK), and Scientific
// Computing and Imaging Institute, University of Utah (USA).
//
// License for the specific language governing rights and limitations under
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
// Description: Render a VTK Unstructured Grid file as a PNG
//
///////////////////////////////////////////////////////////////////////////////

36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkPolyData.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkWindowToImageFilter.h>
#include <vtkPNGWriter.h>
#include <vtkGraphicsFactory.h>
#include <vtkXMLUnstructuredGridReader.h>
#include <vtkDataSetMapper.h>
#include <vtkLookupTable.h>
#include <vtkPointData.h>
#include <vtkCamera.h>

#include <iostream>
using namespace std;

int main(int argc, char * argv[])
{
Chris Cantwell's avatar
Chris Cantwell committed
56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71
    if (argc != 2 && argc != 4)
    {
        cout << "Usage: VtkToPng vtk-file [lower upper]" << endl;
        exit(-1);
    }

    string vInput = argv[1];
    string vOutput = vInput.substr(0, vInput.find_last_of('.')) + ".png";

    // Setup offscreen rendering
    vtkSmartPointer<vtkGraphicsFactory> graphics_factory =
            vtkSmartPointer<vtkGraphicsFactory>::New();
    graphics_factory->SetOffScreenOnlyMode( 1);
    graphics_factory->SetUseMesaClasses( 1 );

    // Create a poly data reader and retrieve dataset from file
72 73
    vtkSmartPointer<vtkXMLUnstructuredGridReader> reader =
            vtkSmartPointer<vtkXMLUnstructuredGridReader>::New();
Chris Cantwell's avatar
Chris Cantwell committed
74 75 76
    reader->SetFileName(vInput.c_str());
    reader->Update();

77 78
    vtkSmartPointer<vtkDataSet> data = 
            vtkSmartPointer<vtkDataSet>(reader->GetOutputAsDataSet());
Chris Cantwell's avatar
Chris Cantwell committed
79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
    data->GetPointData()->SetActiveScalars("u");

    double scalar_range[2];
    data->GetScalarRange(scalar_range);
    if (argc == 4)
    {
        scalar_range[0] = atof(argv[2]);
        scalar_range[1] = atof(argv[3]);
    }

    // Lookup table
    vtkSmartPointer<vtkLookupTable> lookup = vtkSmartPointer<vtkLookupTable>::New();
    lookup->SetHueRange(0.0,1.0);
    lookup->SetSaturationRange(1,1);
    lookup->SetTableRange(scalar_range);
    lookup->SetValueRange(1,1);
    lookup->Build();

    // Create a mapper and actor
    vtkSmartPointer<vtkDataSetMapper> mapper =
            vtkSmartPointer<vtkDataSetMapper>::New();
100
#if VTK_MAJOR_VERSION <= 5
Chris Cantwell's avatar
Chris Cantwell committed
101
    mapper->SetInput(data);
102 103 104
#else
    mapper->SetInputData(data);
#endif
Chris Cantwell's avatar
Chris Cantwell committed
105 106 107 108 109 110 111 112 113 114 115 116 117
    mapper->ImmediateModeRenderingOn();
    mapper->ScalarVisibilityOn();
    mapper->SetScalarModeToUsePointData();
    mapper->UseLookupTableScalarRangeOn();
    //mapper->SetScalarRange(data->GetScalarRange());
    mapper->SetLookupTable(lookup);


    vtkSmartPointer<vtkActor> actor =
            vtkSmartPointer<vtkActor>::New();
    actor->SetMapper(mapper);

    // Configure camera position and direction
118
    vtkSmartPointer<vtkCamera> camera = vtkSmartPointer<vtkCamera>::New();
Chris Cantwell's avatar
Chris Cantwell committed
119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152
    camera->SetPosition(0.0,-1.0,1.0);
    camera->SetFocalPoint(0,0,0);

    // A renderer and render window
    vtkSmartPointer<vtkRenderer> renderer =
            vtkSmartPointer<vtkRenderer>::New();
    vtkSmartPointer<vtkRenderWindow> renderWindow =
            vtkSmartPointer<vtkRenderWindow>::New();
    renderWindow->SetOffScreenRendering( 1 );
    renderWindow->AddRenderer(renderer);

    // Add the actors to the scene
    renderer->AddActor(actor);
    renderer->SetBackground(0,0,0); // Background color white
    renderer->SetActiveCamera(camera);
    renderer->ResetCamera();

    renderWindow->Render();

    // Create an image of scene
    vtkSmartPointer<vtkWindowToImageFilter> windowToImageFilter =
            vtkSmartPointer<vtkWindowToImageFilter>::New();
    windowToImageFilter->SetInput(renderWindow);
    windowToImageFilter->SetMagnification(4);
    windowToImageFilter->Update();

    // Write image to PNG
    vtkSmartPointer<vtkPNGWriter> writer =
            vtkSmartPointer<vtkPNGWriter>::New();
    writer->SetFileName(vOutput.c_str());
    writer->SetInputConnection(windowToImageFilter->GetOutputPort());
    writer->Write();

    return EXIT_SUCCESS;
153
}