VTK-椭圆内的2D点云

Question

Using VTK, I want to create a cloud of points (random amount) located inside an ellipse.

So far I've got this:

vtkSmartPointer<vtkPointSource> pointSource = vtkSmartPointer<vtkPointSource>::New();
pointSource->SetCenter(0.0, 0.0, 0.0);
pointSource->SetNumberOfPoints(nPoints);
pointSource->SetRadius(radius);
pointSource->Update();

However I wonder how to describe it as an elliptical shaped cloud .

Answer 1

You could use a vtkTransform to convert the point source sphere to an ellipse. Here's an example that scales a plane: http://www.vtk.org/gitweb?p=VTK.git;a=blob;f=Examples/Modelling/Python/expCos.py