python VTK example（2） --.vtp文件加载、保存_python读取vtp

Arrays

GetValues.py

def main():
    # setup sphere
    sphereSource = vtk.vtkSphereSource()
    sphereSource.Update()

    polydata = vtk.vtkPolyData()
    #print(sphereSource.GetOutput())
    polydata.ShallowCopy(sphereSource.GetOutput())

    normals = polydata.GetPointData().GetNormals()
    normal0 = normals.GetTuple3(3)

    print("Normal0: {:3.1f} {:3.1f} {:3.1f}".format(normal0[0], normal0[1], normal0[2]))
    print(normal0)
1
2
3
4
5
6
7
8
9
10
11
12
13
14

output

Normal0: 0.8 0.0 0.6
(0.7818315029144287, 0.0, 0.6234897971153259)
1
2

RenameArray.py

保存文件：”Test.vtp”
vtkxmlpolydatawriter（）用来写入VTK XML polydata 格式的文件。
vtkcellarray（）支持的列表结构形式：(n,id1,id2,…,idn, n,id1,id2,…,idn, …)其中n是在结构中点的数目，ID为偏移相关点列表。

读取文件：”Test.vtp”

#include <vtkXMLPolyDataReader.h>
#include <vtkSmartPointer.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>

int main()
{
    std::string filename = "cow.vtp";

    vtkSmartPointer<vtkXMLPolyDataReader> reader =
        vtkSmartPointer<vtkXMLPolyDataReader>::New();
    reader->SetFileName(filename.c_str());
    reader->Update();

    vtkSmartPointer<vtkPolyDataMapper> mapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
    mapper->SetInputConnection(reader->GetOutputPort());

    vtkSmartPointer<vtkActor> actor =
        vtkSmartPointer<vtkActor>::New();
    actor->SetMapper(mapper);

    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(.3, .6, .3); 
    renderWindow->Render();
    renderWindowInteractor->Start();

    return 0;
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40