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This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

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The following code does not render the axes when magnification is not 1.

import sys
import vtk
print vtk.vtkVersion().GetVTKVersion()

#.SetSolidTypeToIcosahedron();
cs = vtk.vtkConeSource()
cs.SetResolution(36)
cs.SetRadius(1.0)
m = vtk.vtkPolyDataMapper()
m.SetInputData(cs.GetOutput())
p = vtk.vtkProperty()
p.SetRepresentationToWireframe()
a = vtk.vtkActor()
a.SetMapper(m)
a.SetProperty(p)
p.SetColor(0.8, .1, .9)

ren = vtk.vtkRenderer()
ren.SetBackground(0.7, 0.7, 0.7)
ren.AddViewProp(a)
ren.viewport = (0, 0, 0.5, 1.0)

axes = vtk.vtkCubeAxesActor2D()
axes.SetInputData(cs.GetOutput())
axes.SetCamera(ren.GetActiveCamera())
ren.AddViewProp(axes)

ren.GetActiveCamera().SetPosition(0.0, 2.0, 0.0)
ren.GetActiveCamera().SetFocalPoint(0.0, 0.0, 0.0)
ren.GetActiveCamera().SetParallelProjection(True)

renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren)
iren = vtk.vtkRenderWindowInteractor()
cs.Update()

iren.SetRenderWindow(renWin)

ren.ResetCamera()
iren.Initialize()

w2if = vtk.vtkWindowToImageFilter()
w2if.SetMagnification(int(sys.argv[1]))
w2if.SetInput(renWin)
ex = vtk.vtkPNGWriter()
ex.SetFileName('bar.png')
ex.SetInputConnection(w2if.GetOutputPort())
cs.Update()
renWin.Render()
ex.Update()
ex.Write()

iren.Start()

You can see more detail about the issue at

https://github.com/enthought/mayavi/issues/314

but the gist of the issue is, as far as I could gather, that the tiling disrupts the Ortho transformation, producing an incorrect vtkRenderer::WorldToView transformation.

I might keep digging into the issue, but not being familiar with the internals, I don't know if this is intended behavior that is supposed to be offset somewhere else.