Added test for four dependent comps with gradient opacity

Rendering/Volume/Testing/Cxx/CMakeLists.txt

@@ -56,6 +56,7 @@ set (VolumeOpenGL2CxxTests
   TestGPURayCastCameraInsideSmallSpacing.cxx
   TestGPURayCastCellData.cxx
   TestGPURayCastClipping.cxx
+  TestGPURayCastFourComponentsDependentGradient.cxx
   TestGPURayCastGradientOpacity.cxx
   TestGPURayCastPositionalLights.cxx
   TestGPURayCastReleaseResources.cxx

Rendering/Volume/Testing/Cxx/TestGPURayCastFourComponentsDependentGradient.cxx

+/*=========================================================================
+
+  Program:   Visualization Toolkit
+  Module:    TestGPURayCastFourComponentsDependentGradient.cxx
+
+  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
+  All rights reserved.
+  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even
+  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+  PURPOSE.  See the above copyright notice for more information.
+
+=========================================================================*/
+
+// Description
+// This is a test for volume rendering using the GPU ray cast
+// mapper of a dataset with four components treating them as
+// dependent and applying a gradient opacity function
+
+#include "vtkCamera.h"
+#include "vtkColorTransferFunction.h"
+#include "vtkGPUVolumeRayCastMapper.h"
+#include "vtkNew.h"
+#include "vtkPiecewiseFunction.h"
+#include "vtkRegressionTestImage.h"
+#include "vtkRenderWindow.h"
+#include "vtkRenderWindowInteractor.h"
+#include "vtkRenderer.h"
+#include "vtkTestUtilities.h"
+#include "vtkTesting.h"
+#include "vtkVolumeProperty.h"
+#include "vtkXMLImageDataReader.h"
+
+int TestGPURayCastFourComponentsDependentGradient(int argc, char *argv[])
+{
+  cout << "CTEST_FULL_OUTPUT (Avoid ctest truncation of output)" << endl;
+
+  char *cfname=
+    vtkTestUtilities::ExpandDataFileName(argc, argv, "Data/vase_4comp.vti");
+
+  vtkNew<vtkXMLImageDataReader> reader;
+  reader->SetFileName(cfname);
+  delete [] cfname;
+
+  vtkNew<vtkRenderWindow> renWin;
+  renWin->SetSize(301, 300); // Intentional NPOT size
+  renWin->SetMultiSamples(0);
+
+  vtkNew<vtkRenderer> ren;
+  renWin->AddRenderer(ren.GetPointer());
+
+  vtkNew<vtkRenderWindowInteractor> iren;
+  iren->SetRenderWindow(renWin.GetPointer());
+
+  renWin->Render();
+
+  // Volume render the dataset
+  vtkNew<vtkGPUVolumeRayCastMapper> mapper;
+  mapper->AutoAdjustSampleDistancesOff();
+  mapper->SetSampleDistance(0.5);
+  mapper->SetInputConnection(reader->GetOutputPort());
+
+  // Opacity transfer function
+  vtkNew<vtkPiecewiseFunction> pf;
+  pf->AddPoint(0, 0);
+  pf->AddPoint(255, 1);
+
+  // Gradient opacity transfer function
+  vtkNew<vtkPiecewiseFunction> pf1;
+  pf1->AddPoint(30, 0);
+  pf1->AddPoint(255, 1);
+
+  // Volume property with independent components OFF
+  vtkNew<vtkVolumeProperty> property;
+  property->IndependentComponentsOff();
+  property->SetScalarOpacity(pf.GetPointer());
+  property->SetGradientOpacity(pf1.GetPointer());
+
+  vtkNew<vtkVolume> volume;
+  volume->SetMapper(mapper.GetPointer());
+  volume->SetProperty(property.GetPointer());
+  ren->AddVolume(volume.GetPointer());
+
+  ren->ResetCamera();
+  renWin->Render();
+
+  iren->Initialize();
+
+  int retVal = vtkRegressionTestImage( renWin.GetPointer() );
+  if( retVal == vtkRegressionTester::DO_INTERACTOR)
+    {
+    iren->Start();
+    }
+
+  return !retVal;
+}

Rendering/Volume/Testing/Data/Baseline/TestGPURayCastFourComponentsDependentGradient.png.md5

+4722cd9f7a6956e605532a2ac4183303