Hi thanks a lot.

This worked well and i could play around with it and using many line sources would serve my task.

I was wondering if a source already exists that combines the line sources and models a rectangular divergent beam.

I was trying to figure out how Slicer RT did it

```
points = vtk.vtkPoints()
points.SetNumberOfPoints(5)
cellArray = vtk.vtkCellArray()
x1 = -100.0
x2 = 100
y1 = -100
y2 = 100
points.SetPoint(0, 0.0, 0.0, -212.0)
points.SetPoint(1, x1, y1, -212.0)
points.SetPoint(2, x1, y2, -212.0)
points.SetPoint(3, x2, y2, -212.0)
points.SetPoint(3, x2, y1, -212.0)
cellArray.InsertNextCell(3)
cellArray.InsertCellPoint(0)
cellArray.InsertCellPoint(1)
cellArray.InsertCellPoint(2)
cellArray.InsertNextCell(3)
cellArray.InsertCellPoint(0)
cellArray.InsertCellPoint(2)
cellArray.InsertCellPoint(3)
cellArray.InsertNextCell(3)
cellArray.InsertCellPoint(0)
cellArray.InsertCellPoint(3)
cellArray.InsertCellPoint(4)
cellArray.InsertNextCell(3)
cellArray.InsertCellPoint(0)
cellArray.InsertCellPoint(4)
cellArray.InsertCellPoint(1)
cellArray.InsertNextCell(4)
cellArray.InsertCellPoint(1)
cellArray.InsertCellPoint(2)
cellArray.InsertCellPoint(3)
cellArray.InsertCellPoint(4)
line = vtk.vtkLineSource()
line.SetPoints(points)
line.SetPolys(cellArray)
lineNode = slicer.modules.models.logic().AddModel(line.GetOutputPort())
```

And I am not quite sure which type of vtkSource was used here.

And what is the reason, that the lines, that I already got with your help, are only visible in 3D part, but not in the other scenes (R, Y, G).

Thanks a lot again and have a nice weekend!