The solution to the vtk volume rendering code error (the code can run in vtk7, 8, 9), and the VTK dataset website

链接：vtk7.1.1官方文档

链接：官方示例代码

链接：VTK资源网站（Just search for whatever resource you need,The dataset in the official website example、resources are basically）

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Volume rendering code does not run,The solution that keeps giving errors

• 大家应该都看过VTKGraphics and images advanced that book,那本书的VTK版本为5.10.1,The volume rendering part of the code with the book is inVTK7 8 9version does not work,Something needs to be changed a bit（没有《VTKAdvanced graphics》You can chat with me privately for this book and the code accompanying the book,I can send Baidu network disk）
• Also need to pay attention to adding：VTK_MODULE_INIT(vtkRenderingVolumeOpenGL2); 否则会报错

#include<vtkAutoInit.h>
VTK_MODULE_INIT(vtkRenderingOpenGL2)
VTK_MODULE_INIT(vtkInteractionStyle);
VTK_MODULE_INIT(vtkRenderingFreeType);
VTK_MODULE_INIT(vtkRenderingVolumeOpenGL2); 
#include <vtkSmartPointer.h>
#include <vtkImageData.h>
#include <vtkStructuredPoints.h>
#include <vtkStructuredPointsReader.h>
#include <vtkVolumeRayCastCompositeFunction.h>
#include <vtkGPUVolumeRayCastMapper.h>
#include <vtkVolumeRayCastMapper.h>
#include <vtkColorTransferFunction.h>
#include <vtkPiecewiseFunction.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkVolumeProperty.h>
#include <vtkAxesActor.h>
#include <vtkImageShiftScale.h>
#include <vtkImageCast.h>
#include <vtkFixedPointVolumeRayCastMapper.h>

// ../data/mummy.128.vtk
int main(int argc, char *argv[])
{
    
	vtkSmartPointer<vtkStructuredPointsReader> reader =
		vtkSmartPointer<vtkStructuredPointsReader>::New();
	reader->SetFileName(../data/mummy.128.vtk);
	reader->Update();

	//vtkSmartPointer<vtkVolumeRayCastCompositeFunction> rayCastFun = vtkSmartPointer<vtkVolumeRayCastCompositeFunction>::New(); // 舍弃了

	vtkSmartPointer<vtkFixedPointVolumeRayCastMapper> volumeMapper = vtkSmartPointer<vtkFixedPointVolumeRayCastMapper>::New();
	volumeMapper->SetInputDataObject(reader->GetOutput());
	//volumeMapper->SetVolumeRayCastFunction(rayCastFun); // 舍弃了

	vtkSmartPointer<vtkVolumeProperty> volumeProperty =  vtkSmartPointer<vtkVolumeProperty>::New();
	volumeProperty->SetInterpolationTypeToLinear();
	volumeProperty->ShadeOn();  //Turn light shading on or off
	volumeProperty->SetAmbient(0.4);
	volumeProperty->SetDiffuse(0.6);
	volumeProperty->SetSpecular(0.2);

	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

	vtkSmartPointer<vtkPiecewiseFunction> volumeGradientOpacity = vtkSmartPointer<vtkPiecewiseFunction>::New();
	volumeGradientOpacity->AddPoint(10,  0.0);
	volumeGradientOpacity->AddPoint(90,  0.5);
	volumeGradientOpacity->AddPoint(100, 1.0);
	//volumeProperty->SetGradientOpacity(volumeGradientOpacity);//Sets the gradient opacity effect contrast

	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(1, 1, 0);
	ren->AddVolume( volume ); 

	vtkSmartPointer<vtkRenderWindow> renWin = vtkSmartPointer<vtkRenderWindow>::New();
	renWin->AddRenderer(ren);
	renWin->SetSize(640, 480);
	renWin->Render();
	renWin->SetWindowName("VolumeRenderingApp");

	vtkSmartPointer<vtkRenderWindowInteractor> iren = vtkSmartPointer<vtkRenderWindowInteractor>::New();
	iren->SetRenderWindow(renWin);
	ren->ResetCamera();

	renWin->Render();
	iren->Start();

	std::cin.get();

	return EXIT_SUCCESS;
}