<div dir="ltr">Hi friends,<div><br></div><div><br></div><div>                  I want to calculate the area of the clipped surface.As shown in image below, I want  to calculate the area of red region / read only read region. How can we do that ?</div><div><br></div><div><img src="cid:ii_157dcb8d7e428ae4" alt="Inline image 1" width="317" height="335"><br></div><div><br></div><div><br></div><div>Code:</div><div><br></div><div><pre style="font-family:consolas;color:black;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial">vtkSmartPointer<vtkSuperquadricSource> superquadricSource =
                vtkSmartPointer<vtkSuperquadricSource>::New();
        superquadricSource->SetPhiRoundness(3.1);
        superquadricSource->SetThetaRoundness(2.2);
 
        <span style="color:green">// Define a clipping plane</span>
        vtkSmartPointer<vtkPlane> clipPlane =
                vtkSmartPointer<vtkPlane>::New();
        clipPlane->SetNormal(1.0, -1.0, -1.0);
        clipPlane->SetOrigin(0.0, 0.0, 0.0);
 
        <span style="color:green">// Clip the source with the plane</span>
        vtkSmartPointer<vtkClipPolyData> clipper =
                vtkSmartPointer<vtkClipPolyData>::New();
        clipper->SetInputConnection(superquadricSource->GetOutputPort());
        clipper->SetClipFunction(clipPlane);
 
 
        <span style="color:green">//Create a mapper and actor</span>
        vtkSmartPointer<vtkPolyDataMapper> superquadricMapper =
                vtkSmartPointer<vtkPolyDataMapper>::New();
        superquadricMapper->SetInputConnection(clipper->GetOutputPort());
 
        
 
 
        vtkSmartPointer<vtkActor> superquadricActor =
                vtkSmartPointer<vtkActor>::New();
        superquadricActor->SetMapper(superquadricMapper);
 
        <span style="color:green">// Create a property to be used for the back faces. Turn off all</span>
        <span style="color:green">// shading by specifying 0 weights for specular and diffuse. Max the</span>
        <span style="color:green">// ambient.</span>
        vtkSmartPointer<vtkProperty> backFaces =
                vtkSmartPointer<vtkProperty>::New();
        backFaces->SetSpecular(0.0);
        backFaces->SetDiffuse(0.0);
        backFaces->SetAmbient(1.0);
        backFaces->SetAmbientColor(1.0000, 0.3882, 0.2784);
        <span style="color:green">//backFaces->SetAmbientColor(1.0000, 0, 0.0);</span>
        <span style="color:green">//backFaces->SetOpacity(0.7);</span>
 
        superquadricActor->SetBackfaceProperty(backFaces);
        
 
        <span style="color:green">// Create a renderer</span>
        vtkSmartPointer<vtkRenderer> renderer =
                vtkSmartPointer<vtkRenderer>::New();
 
        vtkSmartPointer<vtkRenderWindow> renderWindow =
                vtkSmartPointer<vtkRenderWindow>::New();
        renderWindow->SetWindowName(<span style="color:rgb(163,21,21)">"SolidClip"</span>);
 
        renderWindow->AddRenderer(renderer);
 
        vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
                vtkSmartPointer<vtkRenderWindowInteractor>::New();
        renderWindowInteractor->SetRenderWindow(renderWindow);
 
        <span style="color:green">//Add actors to the renderers</span>
        renderer->AddActor(superquadricActor);
        renderWindow->Render();
 
        <span style="color:green">//Interact with the window</span>
        renderWindowInteractor->Start();</pre></div></div>