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113 lines
2.7 KiB
113 lines
2.7 KiB
2 years ago
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package require vtk
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package require vtkinteraction
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# This script demonstrates the use of mangled Mesa to generate an
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# off-screen copy of the OpenGL render window. A cone is created
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# and added to the OpenGL renderer. When the user press the Print
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# button, a copy of the scene is rendered on the Mesa window
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# (which is set to render in memory) and then the scene is save to
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# a png file using the png writer.
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# Create the pipeline
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# Note that an equivalent Mesa object has to be created for each
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# OpenGL object.
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# The OpenGL render window
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vtkRenderWindow rw
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# The Mesa equivalent
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vtkXMesaRenderWindow mrw
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mrw OffScreenRenderingOn
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# OpenGL
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vtkRenderer ren
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rw AddRenderer ren
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# Mesa
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vtkMesaRenderer mren
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mrw AddRenderer mren
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vtkConeSource cone
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# OpenGL
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vtkPolyDataMapper map
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map SetInputConnection [cone GetOutputPort]
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# Mesa
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vtkMesaPolyDataMapper mmap
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mmap SetInputConnection [cone GetOutputPort]
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# OpenGL
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vtkActor actor
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actor SetMapper map
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# Mesa
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vtkMesaActor mactor
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mactor SetMapper mmap
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# Add the actor to the renderer
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ren AddActor actor
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mren AddActor mactor
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# These are for creating an image from the Mesa render window
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vtkWindowToImageFilter w2if
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w2if SetInput mrw
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vtkPNGWriter writer
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writer SetInputConnection [w2if GetOutputPort]
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writer SetFileName "MesaPrintout.png"
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set mesaCamera [mren GetActiveCamera]
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set openGLCamera [ren GetActiveCamera]
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proc PrintWithMesa {} {
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global mesaCamera openGLCamera
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# This is needed to create a default mesa light
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mrw Render
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set mesaLights [mren GetLights]
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eval $mesaLights InitTraversal
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set mesaLight [$mesaLights GetNextItem]
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set openGLLights [ren GetLights]
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eval $openGLLights InitTraversal
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set openGLLight [$openGLLights GetNextItem]
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eval $mesaCamera SetPosition [$openGLCamera GetPosition]
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eval $mesaCamera SetFocalPoint [$openGLCamera GetFocalPoint]
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eval $mesaCamera SetViewUp [$openGLCamera GetViewUp]
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eval $mesaCamera SetClippingRange [$openGLCamera GetClippingRange]
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eval $mesaLight DeepCopy $openGLLight
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mrw Render
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# This is here to force the window to image filter to
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# update it's image. Required.
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w2if Modified
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writer Write
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}
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# ------------------- Create the UI ---------------------
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wm withdraw .
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# Create the toplevel window
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toplevel .top
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wm title .top {Printing with Mesa Offscreen Demo}
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# Create two frames
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frame .top.f1
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frame .top.f2
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pack .top.f1 .top.f2 -side top -expand 1 -fill both
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vtkTkRenderWidget .top.f1.rw -width 400 -height 400 -rw rw
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::vtk::bind_tk_render_widget .top.f1.rw
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pack .top.f1.rw -expand 1 -fill both
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button .top.f2.b0 -text "Print" -command {PrintWithMesa}
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button .top.f2.b1 -text "Quit" -command ::vtk::cb_exit
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pack .top.f2.b0 -expand 1 -fill x
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pack .top.f2.b1 -expand 1 -fill x
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