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/*=========================================================================
Program: Visualization Toolkit
Module: TestOpacity.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.
=========================================================================*/
// This test covers rendering translucent materials with depth peeling
// technique.
//
// The command line arguments are:
// -I => run in interactive mode; unless this is used, the program will
// not allow interaction and exit
#include "vtkTestUtilities.h"
#include "vtkRegressionTestImage.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderWindow.h"
#include "vtkRenderer.h"
#include "vtkActor.h"
#include "vtkGlyph3D.h"
#include "vtkSphereSource.h"
#include "vtkImageGridSource.h"
#include "vtkPolyDataMapper.h"
#include "vtkImageData.h"
#include "vtkPointData.h"
#include "vtkPlaneSource.h"
#include "vtkLookupTable.h"
#include "vtkProperty.h"
#include "vtkCubeSource.h"
// if not defined, we use spherical glyphs (slower) instead of cubic
// glyphs (faster)
// #define VTK_TEST_OPACITY_CUBE
int TestOpacity(int argc, char* argv[])
{
// Standard rendering classes
vtkRenderer *renderer = vtkRenderer::New();
vtkRenderWindow *renWin = vtkRenderWindow::New();
renWin->SetMultiSamples(0);
renWin->SetAlphaBitPlanes(1);
renWin->AddRenderer(renderer);
renderer->Delete();
vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
iren->SetRenderWindow(renWin);
renWin->Delete();
// We create a bunch of translucent spheres with an opaque plane in
// the middle
// we create a uniform grid and glyph it with a spherical shape.
// Create the glyph source
vtkSphereSource *sphere=vtkSphereSource::New();
sphere->SetRadius(1);
sphere->SetCenter(0.0,0.0,0.0);
sphere->SetThetaResolution(10);
sphere->SetPhiResolution(10);
sphere->SetLatLongTessellation(0);
vtkCubeSource *cube=vtkCubeSource::New();
cube->SetXLength(1.0);
cube->SetYLength(1.0);
cube->SetZLength(1.0);
cube->SetCenter(0.0,0.0,0.0);
vtkImageGridSource *grid=vtkImageGridSource::New();
grid->SetGridSpacing(1,1,1);
grid->SetGridOrigin(0,0,0);
grid->SetLineValue(1.0); // white
grid->SetFillValue(0.5); // gray
grid->SetDataScalarTypeToUnsignedChar();
grid->SetDataExtent(0,10,0,10,0,10);
grid->SetDataSpacing(0.1,0.1,0.1);
grid->SetDataOrigin(0.0,0.0,0.0);
grid->Update(); // to get the range
double range[2];
grid->GetOutput()->GetPointData()->GetScalars()->GetRange(range);
vtkGlyph3D *glyph=vtkGlyph3D::New();
glyph->SetInputConnection(0,grid->GetOutputPort(0));
grid->Delete();
#ifdef VTK_TEST_OPACITY_CUBE
glyph->SetSourceConnection(cube->GetOutputPort(0));
#else
glyph->SetSourceConnection(sphere->GetOutputPort(0));
#endif
sphere->Delete();
cube->Delete();
glyph->SetScaling(1); // on
glyph->SetScaleModeToScaleByScalar();
glyph->SetColorModeToColorByScale();
glyph->SetScaleFactor(0.05);
glyph->SetRange(range);
glyph->SetOrient(0);
glyph->SetClamping(0);
glyph->SetVectorModeToUseVector();
glyph->SetIndexModeToOff();
glyph->SetGeneratePointIds(0);
vtkPolyDataMapper *mapper=vtkPolyDataMapper::New();
mapper->SetInputConnection(glyph->GetOutputPort(0));
glyph->Delete();
// This creates a blue to red lut.
vtkLookupTable *lut = vtkLookupTable::New();
lut->SetHueRange (0.667, 0.0);
mapper->SetLookupTable(lut);
lut->Delete();
mapper->SetScalarRange(range);
vtkActor *actor=vtkActor::New();
actor->SetMapper(mapper);
mapper->Delete();
renderer->AddActor(actor);
actor->Delete();
vtkProperty *property=vtkProperty::New();
property->SetOpacity(0.2);
property->SetColor(0.0,1.0,0.0);
actor->SetProperty(property);
property->Delete();
vtkPlaneSource *plane=vtkPlaneSource::New();
plane->SetCenter(0.5,0.5,0.5);
vtkPolyDataMapper *planeMapper=vtkPolyDataMapper::New();
planeMapper->SetInputConnection(0,plane->GetOutputPort(0));
plane->Delete();
vtkActor *planeActor=vtkActor::New();
planeActor->SetMapper(planeMapper);
planeMapper->Delete();
renderer->AddActor(planeActor);
vtkProperty *planeProperty=vtkProperty::New();
planeProperty->SetOpacity(1.0);
planeProperty->SetColor(1.0,0.0,0.0);
planeActor->SetProperty(planeProperty);
planeProperty->Delete();
planeProperty->SetBackfaceCulling(0);
planeProperty->SetFrontfaceCulling(0);
planeActor->Delete();
renderer->SetUseDepthPeeling(1);
// reasonable depth peeling settings
// no more than 50 layers of transluceny
renderer->SetMaximumNumberOfPeels(50);
// stop when less than 2 in 1000 pixels changes
renderer->SetOcclusionRatio(0.002);
property->SetBackfaceCulling(1);
property->SetFrontfaceCulling(0);
// Standard testing code.
renderer->SetBackground(0.0,0.5,0.0);
renWin->SetSize(300,300);
renWin->Render();
if(renderer->GetLastRenderingUsedDepthPeeling())
{
cout<<"depth peeling was used"<<endl;
}
else
{
cout<<"depth peeling was not used (alpha blending instead)"<<endl;
}
int retVal = vtkRegressionTestImage( renWin );
if ( retVal == vtkRegressionTester::DO_INTERACTOR)
{
iren->Start();
}
// Cleanup
iren->Delete();
return !retVal;
}
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