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前言
本文分享VTK样例SaveSceneToFile，希望对各位小伙伴有所帮助！
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1. SaveSceneToFile
该样例介绍如何保存当前场景到文件中，并将其再次打开。
2. 样例代码
#include <vtkSmartPointer.h>
#include <vtkBYUReader.h>
#include <vtkOBJReader.h>
#include <vtkPLYReader.h>
#include <vtkPolyDataReader.h>
#include <vtkSTLReader.h>
#include <vtkXMLPolyDataReader.h>
#include <vtkSphereSource.h>
#include <vtkActor.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkCamera.h>
#include <vtkNamedColors.h>
#include <vtkTimerLog.h>
#include <vtksys/SystemTools.hxx>
#include <vtksys/RegularExpression.hxx>
#include <vtkActor.h>
#include <vtkCamera.h>
namespace
{
void SaveSceneToFile(std::string fileName,
vtkActor *actor,
vtkCamera *camera);
}
#include <vtkActor.h>
#include <vtkCamera.h>
namespace
{
void RestoreSceneFromFile(std::string fileName,
vtkActor *actor,
vtkCamera *camera);
}
int main (int argc, char *argv[])
{
auto reader = vtkSmartPointer<vtkXMLPolyDataReader>::New();
reader->SetFileName("D:/Data/VTKData/horse.vtp");
reader->Update();
auto polyData = reader->GetOutput();
// Visualize
vtkSmartPointer<vtkNamedColors> colors =
vtkSmartPointer<vtkNamedColors>::New();
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputData(polyData);
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
actor->GetProperty()->SetDiffuseColor(colors->GetColor3d("Crimson").GetData());
actor->GetProperty()->SetSpecular(.6);
actor->GetProperty()->SetSpecularPower(30);
;
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
renderer->AddActor(actor);
renderer->SetBackground(colors->GetColor3d("Silver").GetData());
// Interact to change camera
renderWindow->Render();
renderWindowInteractor->Start();
// After the interaction is done, save the scene
SaveSceneToFile(argv[2], actor, renderer->GetActiveCamera());
renderWindow->Render();
renderWindowInteractor->Start();
// After interaction , restore the scene
RestoreSceneFromFile(argv[2], actor, renderer->GetActiveCamera());
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
namespace
{
#include <fstream>
void SaveSceneToFile(std::string fileName,
vtkActor * /* actor */,
vtkCamera *camera)
{
// Actor
// Position, orientation, origin, scale, usrmatrix, usertransform
//Camera
// FocalPoint, Position, ViewUp, ViewAngle, ClippingRange
std::ofstream saveFile(fileName, std::ofstream::out);
double vector[3];
double scalar;
camera->GetFocalPoint(vector);
saveFile << "Camera:FocalPoint "
<< vector[0] << ", "
<< vector[1] << ", "
<< vector[2] << std::endl;
camera->GetPosition(vector);
saveFile << "Camera:Position "
<< vector[0] << ", "
<< vector[1] << ", "
<< vector[2] << std::endl;
camera->GetViewUp(vector);
saveFile << "Camera:ViewUp "
<< vector[0] << ", "
<< vector[1] << ", "
<< vector[2] << std::endl;
scalar = camera->GetViewAngle();
saveFile << "Camera:ViewAngle "
<< scalar << std::endl;
camera->GetClippingRange(vector);
saveFile << "Camera:ClippingRange "
<< vector[0] << ", "
<< vector[1] << std::endl;
saveFile.close();
}
}
namespace
{
#include <fstream>
void RestoreSceneFromFile(std::string fileName,
vtkActor * /* actor */,
vtkCamera *camera)
{
std::ifstream saveFile(fileName);
std::string line;
vtksys::RegularExpression reCP("^Camera:Position");
vtksys::RegularExpression reCFP("^Camera:FocalPoint");
vtksys::RegularExpression reCVU("^Camera:ViewUp");
vtksys::RegularExpression reCVA("^Camera:ViewAngle");
vtksys::RegularExpression reCCR("^Camera:ClippingRange");
vtksys::RegularExpression floatNumber(
"[^0-9\\.\\-]*([0-9e\\.\\-]*[^,])[^0-9\\.\\-]*([0-9e\\.\\-]*[^,])[^0-9\\.\\-]*([0-9e\\.\\-]*[^,])");
vtksys::RegularExpression floatScalar("[^0-9\\.\\-]*([0-9\\.\\-e]*[^,])");
while (std::getline(saveFile, line) && ! saveFile.eof())
{
if (reCFP.find(line))
{
std::string rest(line, reCFP.end());
if (floatNumber.find(rest))
{
camera->SetFocalPoint(
atof(floatNumber.match(1).c_str()),
atof(floatNumber.match(2).c_str()),
atof(floatNumber.match(3).c_str()));
}
}
else if (reCP.find(line))
{
std::string rest(line, reCP.end());
if (floatNumber.find(rest))
{
camera->SetPosition(
atof(floatNumber.match(1).c_str()),
atof(floatNumber.match(2).c_str()),
atof(floatNumber.match(3).c_str()));
}
}
else if (reCVU.find(line))
{
std::string rest(line, reCVU.end());
if (floatNumber.find(rest))
{
camera->SetViewUp(
atof(floatNumber.match(1).c_str()),
atof(floatNumber.match(2).c_str()),
atof(floatNumber.match(3).c_str()));
}
}
else if (reCVA.find(line))
{
std::string rest(line, reCVA.end());
if (floatScalar.find(rest))
{
camera->SetViewAngle(
atof(floatScalar.match(1).c_str()));
}
}
else if (reCCR.find(line))
{
std::string rest(line, reCCR.end());
if (floatNumber.find(rest))
{
camera->SetClippingRange(
atof(floatNumber.match(1).c_str()),
atof(floatNumber.match(2).c_str()));
}
}
else
{
std::cout << "Unrecognized line: " << line << std::endl;
}
}
saveFile.close();
}
}
结论：
感谢各位小伙伴的点赞+关注，小易会继续努力分享，一起进步！
