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| − | == Overview ==
| + | <big>'''Note:''' We are migrating this content to the slicer.org domain - <font color="orange">The newer page is [https://www.slicer.org/wiki/Slicer3:Volume_Rendering here]</font></big> |
| − | ==Archtecture/Design==
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| − | ==Test the module==
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| − | *Copy the following folder from the svn repository http://www.na-mic.org/svn/Slicer3/trunk/Base/GUI/Testing/VolumeRendering to the following path <YourSlicerBuildDir>\lib\Slicer3\Modules\Packages\VolumeRendering.
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| − | *Restart Slicer
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| − | *Load a MRML-Scene (e. g. tutorial.xml from the [http://www.na-mic.org/Wiki/images/f/f8/Tutorial-with-dicom.zip Tutorial Dataset])
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| − | *Go to the module dropdown and select VolumeRendering
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| − | *Select "all" (if you use the tutorial dataset) as the Source Volume and click LoadNode =>The volume rendered Volume should appear.
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| − | *Play with the transfer function etc.
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| − | *Note: After changing a setting please click on the volume one time to load the new settings
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| − | ==Latest results and limitations==
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| − | ===Description===
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| − | *Loading changing of MRML-Nodes is possible during runtime
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| − | *At the moment no removing of MRML-Nodes possible
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| − | *Change properties (Shading, Interpolation, mapping)
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| − | *Calculate transfer functions automatically
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| − | *Performance:
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| − | **Interrupting is possible in render window.
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| − | **Interrupting somewhere else requires platform dependent coding (q.v. problems)
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| − | *Cropping is possible
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| − | ===Screenshots===
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| − | [[Image:VolumeRendering.jpg|thumb|500px|center|volume rendered label map of the tutorial dataset]]
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| − | [[Image:VolumeRenderingWithShading.jpg|thumb|500px|center|volume rendered label map of the tutorial dataset, shading enabled]]
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| − | [[Image:VolumeRenderingBoneDetection.png|thumb|800px|center|shading enabled, linear interpolation, automatich mapping for bones]]
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| − | ==next Tasks==
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| − | ===ideas implemented in prototyp===
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| − | *Develop different algorithms for labelmap and grayscale volumes -----algorithm for grayscale is missing => new task: presets
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| − | *Find Presets, see also at goals
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| − | *Try to reduce artefacts in labelmaps by using several RGB points in the mapping function -----done, artefacts still there?
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| − | *Implement a possibility to change between different volumes during runtime -----done
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| − | *Have a closer look on the final calculation of the renderer-----Problems, when interrupting outside renderWindow
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| − | *Detect if video card can use 3d Texture Mapping or not, if not use MIP, -----done, there are two new Buttons to simulate having openGl support or not. standard preset is now MIP (performance issue)
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| − | *Add possiblity to change opacity (for labelmaps) -----done, slider
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| − | *Include code to make all models invisible(Good for testing) -----done, new button
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| − | ===not yet implemented in prototyp===
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| − | *Have a closer look on the gradient opacity mapper, when using label maps
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| − | *Try clipping
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| − | *Add progress functionality
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| − | ==Problems==
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| − | *Cannot load the following data
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| − | **spgr (grayscale): tutorial data set (freezes)-----fixed: problems with automatic mapping
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| − | **grayscale (greyscale): brain atlas (freezes)-----fixed:problems with automatic mapping
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| − | **seg (LabelMap): abdomen data set (not freezing, seems to render, but unvisible)-----fixed, use char as datatype, but maybe experimenting with tresholds.
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| − | *How can rendering be interrupted outside renderWindow
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| − | **Do something like [http://www.vtk.org/doc/nightly/html/classvtkRenderWindow.html#007038cc2f7b875bb56a4bcd97937077 vtkRenderWindow::GetEventPending]
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| − | **Problem, may require platform depending code----->Could propably be fixed with tcl-wrapping
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| − | **Experiment with vtkOpenGLVolumeTextureMapper3D, check status more often, debug. add more timers.
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| − | | |
| − | == Goals ==
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| − | Volume rendering presets :
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| − | * MIP (Maximum Intensity Projection)
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| − | **[http://en.wikipedia.org/wiki/Maximum_intensity_projection Wikipedia]
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| − | **[http://www.vtk.org/doc/release/5.0/html/a01399.html vtkFixedPointVolumeRayCastMapper Class Reference]
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| − | * CT Bone and vessel
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| − | **Use Hounsfield units
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| − | ***Bone +400->+1000
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| − | ***Soft tissue +40->+80
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| − | ***Water 0
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| − | ***Fat -60->-100
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| − | ***Lung -400->-600
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| − | ***Air -1000
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| − | **Problem with Vessels: Different contrast mediums?!
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| − | * T1 MR Air/skin interface
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| − | * Label map per-label object rendering
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| − | Slicer3 module interface:
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| − | * Select from loaded volumes
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| − | * Specify preset transfer functions or use KWWidgets tools
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| − | Slicer3 internals:
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| − | * Correct coordinates including transforms
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| − | * Level of detail rendering
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| − | * Proper integration with surface rendering
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| − | Different Volume Rendering Algorithms
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| − | *RayCast
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| − | *2D Texture Mapping
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| − | *3D Texture Mapping
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| − | *...
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| − | == Wish List ==
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| − | * 2D Transfer functions - may require specialized opengl code integrated with VTK. Talk with Gordon about latest work from Utah.
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| − | | |
| − | * use glTexSubImage3D so that incremental changes to the volume can be quickly reflected
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