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64 lines
1.5 KiB
64 lines
1.5 KiB
2 years ago
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package require vtk
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package require vtkinteraction
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# Create the RenderWindow and Renderer
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vtkRenderer ren1
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vtkRenderWindow renWin
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renWin AddRenderer ren1
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vtkRenderWindowInteractor iren
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iren SetRenderWindow renWin
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# create a default polygonal sphere
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vtkSphereSource sphere
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vtkPolyDataMapper sphmapper
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sphmapper SetInputConnection [sphere GetOutputPort]
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vtkActor sphactor
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sphactor SetMapper sphmapper
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# Add the actors to the renderer, set the background to initial
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# color (which is also transparent), set size.
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ren1 AddActor sphactor
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ren1 SetBackground 0.1 0.2 0.4
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renWin SetSize 256 256
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# render first image
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renWin Render
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# create window to image filter, grabbing RGB and alpha
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vtkWindowToImageFilter w2i
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w2i SetInput renWin
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w2i SetInputBufferTypeToRGBA
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# grab window
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w2i Update
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# set up mappers and actors to display the image
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vtkImageMapper im
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im SetColorWindow 255
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im SetColorLevel 127.5
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im SetInputConnection [w2i GetOutputPort]
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vtkActor2D ia2
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ia2 SetMapper im
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# now, change the image (background is now green)
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sphactor SetScale 2 2 2
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ren1 SetBackground 0 1 0
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# add the image of the sphere (keeping the original sphere too)
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ren1 AddActor ia2
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ren1 SetViewport 0 0 1 1
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# render result (the polygonal sphere appears behind a smaller image
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# of itself). Background of original image is transparent, so you
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# can see through it back to the larger sphere and new background.
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renWin Render
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iren AddObserver UserEvent {wm deiconify .vtkInteract}
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# prevent the tk window from showing up then start the event loop
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wm withdraw .
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