How to make a projection from 3D data?
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Hi all.. Please could any one tell me how to get a 2D projection from a 3D Image Data.. As I would like to represent projections in each x-y plane, y-zplane and x-z plane.. at least i need a class name.. thanks in advance
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Re: How to make a projection from 3D data?
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Hello LM,
If you mean Maximum Intensity Projection I have some code that might help you. It is derived from some example TCL-scripts and it gives you a renderwindow in which you can interact with the data and so choose the direction of the MIP. Finding code for capturing the 2D output of the window should be easy. I used the code below on some CT-images (raw-imagedata), you should set all the dimensions yourself. gr. Hugo ------mip.tcl-------- package require vtk package require vtkinteraction # Create the renderer, the render window, and the interactor. The # renderer draws into the render window, the interactor enables # keyboard-based interaction with the scene. vtkRenderer aRenderer vtkRenderWindow renWin renWin AddRenderer aRenderer vtkRenderWindowInteractor iren vtkInteractorStyleTrackballCamera aTrackBallCamera iren SetInteractorStyle aTrackBallCamera iren SetRenderWindow renWin vtkImageReader reader reader SetDataByteOrderToLittleEndian reader SetDataScalarTypeToUnsignedShort reader SetDataExtent 0 511 0 511 0 373 reader SetDataSpacing 0.29 0.29 0.5 reader SetFileDimensionality 3 reader SetFileName "C:/temp/patient.raw" # Adding the volume renderer (ray caster) vtkPiecewiseFunction opacityTransferFunction opacityTransferFunction AddPoint 1100 0 opacityTransferFunction AddPoint 1500 1.0 vtkColorTransferFunction colorTransferFunction colorTransferFunction AddRGBPoint 0.0 0.0 0.0 0.0 colorTransferFunction AddRGBPoint 255.0 1.0 1.0 1.0 vtkVolumeProperty volumeProperty volumeProperty SetColor colorTransferFunction volumeProperty SetScalarOpacity opacityTransferFunction vtkVolumeRayCastMIPFunction MIP vtkVolumeRayCastMapper volumeMapper volumeMapper SetVolumeRayCastFunction MIP volumeMapper SetInputConnection [reader GetOutputPort] vtkVolume volume volume SetMapper volumeMapper volume SetProperty volumeProperty volume VisibilityOn volume Update # Bounding box. vtkOutlineFilter outlineData outlineData SetInputConnection [reader GetOutputPort] vtkPolyDataMapper mapOutline mapOutline SetInputConnection [outlineData GetOutputPort] vtkActor outline outline SetMapper mapOutline [outline GetProperty] SetColor 0 1 0 # Actors are added to the renderer. aRenderer AddActor outline aRenderer AddVolume volume vtkCamera aCamera aRenderer SetActiveCamera aCamera # Setting the color and size of the renderwindow, #initializing the camera position aCamera SetViewUp 0 0 -1 aCamera SetPosition -2 -2 -2 aCamera SetFocalPoint 0 0 0 aCamera ComputeViewPlaneNormal aRenderer ResetCamera aRenderer ResetCameraClippingRange aRenderer SetBackground 0.2 0.2 0.2 renWin SetSize 640 480 # Set up a callback (using command/observer) to bring up the Tcl # command GUI when the keypress-u (UserEvent) key is pressed. iren AddObserver UserEvent {wm deiconify .vtkInteract} # Here we go! iren Initialize #renWin Render #iren Start wm withdraw . ---- end mip.tcl----- LM wrote: > Hi all.. > Please could any one tell me how to get a *2D projection* from a 3D > Image Data.. > As I would like to represent projections in each x-y plane, y-zplane and > x-z plane.. > at least i need a class name.. > thanks in advance > > ------------------------------------------------------------------------ > Yahoo! Photos > Got holiday prints? See all the ways > <http://us.rd.yahoo.com/mail_us/taglines/holidayprints/*http://pa.yahoo.com/*http://us.rd.yahoo.com/mail_us/taglines/photos/evt=38089/*http://pg.photos.yahoo.com/ph//print_splash> > to get quality prints in your hands ASAP. > > > ------------------------------------------------------------------------ > > _______________________________________________ > This is the private VTK discussion list. > Please keep messages on-topic. Check the FAQ at: http://www.vtk.org/Wiki/VTK_FAQ > Follow this link to subscribe/unsubscribe: > http://www.vtk.org/mailman/listinfo/vtkusers -- Hugo Gratama van Andel _______________________________________________ This is the private VTK discussion list. Please keep messages on-topic. Check the FAQ at: http://www.vtk.org/Wiki/VTK_FAQ Follow this link to subscribe/unsubscribe: http://www.vtk.org/mailman/listinfo/vtkusers |
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thanks a lot for ur reply..gr. Hugo This code will be useful so much for me in another level.. But actually for now i need to represent only a projection not max intensity.. mean that i want to get the front, side and top views.. for example.. I am representing a 3D image for a human head.. so i want to view his face and profile in 2D planes.. so do u know a suitable solution regards Hello LM,
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