I wanted to explore vtkPlaneSource’s interfaces SetPoint1 and SetPoint2 with visible 3D Axes.
It’s awkward to find that it’s difficult to control plane’s shape by interfaces SetPoint1 and SetPoint2 directly. So I used vtkAxesActor to show three axes in the world coordinate system.

#include <iostream>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkActor.h>
#include <vtkConeSource.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkLight.h>
#include <vtkCamera.h>
#include <vtkActor2D.h>
#include <vtkPlaneSource.h>
#include <vtkAxesActor.h>
#include <vtkTransform.h>
#include <vtkTransformFilter.h>

using namespace std;

int main()
{
    vtkSmartPointer<vtkPlaneSource> source =
            vtkSmartPointer<vtkPlaneSource>::New();
    source->SetCenter( 0, 0, 0 );
    source->SetPoint1( 0.5, -0.5, 0 );
    source->SetPoint2( -0.5, 0.5, 0 );
    source->Update();

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

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

    double *center = source->GetCenter();
    double *pt1 = source->GetPoint1();
    double *pt2 = source->GetPoint2();
    printf( "center: (%lf, %lf, %lf)\n", center[0], center[1], center[2] );
    printf( "pt1: (%lf, %lf, %lf)\n", pt1[0], pt1[1], pt1[2] );
    printf( "pt2: (%lf, %lf, %lf)\n", pt2[0], pt2[1], pt2[2] );

    vtkSmartPointer<vtkAxesActor> axesActor =
            vtkSmartPointer<vtkAxesActor>::New();

    vtkSmartPointer<vtkRenderer> renderer =
            vtkSmartPointer<vtkRenderer>::New();
    renderer->AddActor( actor );
    renderer->AddActor( axesActor );
    renderer->SetBackground( 0, 0, 0 );

    vtkSmartPointer<vtkRenderWindow> renderWindow =
            vtkSmartPointer<vtkRenderWindow>::New();
    renderWindow->AddRenderer( renderer );

    vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
            vtkSmartPointer<vtkRenderWindowInteractor>::New();
    renderWindowInteractor->SetRenderWindow( renderWindow );

    renderer->ResetCamera();
    renderWindow->Render();
    renderWindowInteractor->Start();
    return 0;
}

output:

center: (0.000000, 0.000000, 0.000000)
pt1: (0.500000, -0.500000, 0.000000)
pt2: (-0.500000, 0.500000, 0.000000)




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