实例64：体绘制管线（光线投影法体绘制）
#include <vtkAutoInit.h>
VTK_MODULE_INIT(vtkRenderingOpenGL2);
VTK_MODULE_INIT(vtkRenderingVolumeOpenGL2); //错误：no override found for 'vtkRayCastImageDisplayHelper'.
VTK_MODULE_INIT(vtkRenderingFreeType);
VTK_MODULE_INIT(vtkInteractionStyle);
#include <vtkSmartPointer.h>
#include <vtkStructuredPoints.h>
#include <vtkStructuredPointsReader.h>
#include <vtkFixedPointVolumeRayCastMapper.h>
#include <vtkColorTransferFunction.h>
#include <vtkPiecewiseFunction.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkVolumeProperty.h>
#include <vtkAxesActor.h>
#include <vtkOrientationMarkerWidget.h>
int main(int argc, char* argv[])
{
vtkSmartPointer<vtkStructuredPointsReader> reader =
vtkSmartPointer<vtkStructuredPointsReader>::New();
reader->SetFileName("C:\\Users\\Administrator\\Desktop\\VTK2\\hellovtk\\vtk_图像处理学习\\第七章_VTK体绘制\\data\\mummy.128.vtk");
reader->Update();
vtkSmartPointer<vtkFixedPointVolumeRayCastMapper> volumeMapper =
vtkSmartPointer<vtkFixedPointVolumeRayCastMapper>::New();
volumeMapper->SetInputData(reader->GetOutput());
//设置光线采样距离
//volumeMapper->SetSampleDistance(volumeMapper->GetSampleDistance()*4);
//设置图像采样步长
//volumeMapper->SetAutoAdjustSampleDistances(0);
//volumeMapper->SetImageSampleDistance(4);
/*************************************************************************/
vtkSmartPointer<vtkVolumeProperty> volumeProperty =
vtkSmartPointer<vtkVolumeProperty>::New();
volumeProperty->SetInterpolationTypeToLinear();
volumeProperty->ShadeOn(); //打开或者关闭阴影测试
volumeProperty->SetAmbient(0.4);
volumeProperty->SetDiffuse(0.6); //漫反射
volumeProperty->SetSpecular(0.2); //镜面反射
//设置不透明度
vtkSmartPointer<vtkPiecewiseFunction> compositeOpacity =
vtkSmartPointer<vtkPiecewiseFunction>::New();
compositeOpacity->AddPoint(70, 0.00);
compositeOpacity->AddPoint(90, 0.40);
compositeOpacity->AddPoint(180, 0.60);
volumeProperty->SetScalarOpacity(compositeOpacity); //设置不透明度传输函数
//compositeOpacity->AddPoint(120, 0.00);//测试隐藏部分数据,对比不同的设置
//compositeOpacity->AddPoint(180, 0.60);
//volumeProperty->SetScalarOpacity(compositeOpacity);
//设置梯度不透明属性
vtkSmartPointer<vtkPiecewiseFunction> volumeGradientOpacity =
vtkSmartPointer<vtkPiecewiseFunction>::New();
volumeGradientOpacity->AddPoint(10, 0.0);
volumeGradientOpacity->AddPoint(90, 0.5);
volumeGradientOpacity->AddPoint(100, 1.0);
volumeProperty->SetGradientOpacity(volumeGradientOpacity);//设置梯度不透明度效果对比
//设置颜色属性
vtkSmartPointer<vtkColorTransferFunction> color =
vtkSmartPointer<vtkColorTransferFunction>::New();
color->AddRGBPoint(0.000, 0.00, 0.00, 0.00);
color->AddRGBPoint(64.00, 1.00, 0.52, 0.30);
color->AddRGBPoint(190.0, 1.00, 1.00, 1.00);
color->AddRGBPoint(220.0, 0.20, 0.20, 0.20);
volumeProperty->SetColor(color);
/********************************************************************************/
vtkSmartPointer<vtkVolume> volume =
vtkSmartPointer<vtkVolume>::New();
volume->SetMapper(volumeMapper);
volume->SetProperty(volumeProperty);
vtkSmartPointer<vtkRenderer> ren = vtkSmartPointer<vtkRenderer>::New();
ren->SetBackground(0, 1, 0);
ren->AddVolume(volume);
vtkSmartPointer<vtkRenderWindow> rw = vtkSmartPointer<vtkRenderWindow>::New();
rw->AddRenderer(ren);
rw->SetSize(640, 480);
rw->Render();
rw->SetWindowName("VolumeRendering PipeLine");
vtkSmartPointer<vtkRenderWindowInteractor> rwi =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
rwi->SetRenderWindow(rw);
/********************************************************************************/
//vtkSmartPointer<vtkAxesActor> axes = vtkSmartPointer<vtkAxesActor>::New();
//axes->SetScale(10);
//vtkSmartPointer<vtkOrientationMarkerWidget> widget =
// vtkSmartPointer<vtkOrientationMarkerWidget>::New();
//widget->SetOutlineColor(1, 1, 1);
//widget->SetViewport(0, 0, 0.2, 0.2);
//widget->SetOrientationMarker(axes);
//widget->SetInteractor(rwi);
//widget->SetEnabled(1);
//widget->InteractiveOn();
ren->ResetCamera();
rw->Render();
rwi->Start();
return 0;
}
