work on fiber visualization for Columbia module: introducing FiberData and StrainFiberTracker

application/gui/properties/buttonpropertywidget.cpp

@@ -49,7 +49,7 @@ namespace campvis {
 
     void ButtonPropertyWidget::onButtonClicked(bool) {
         ButtonProperty* bp = static_cast<ButtonProperty*>(_property);
-        bp->s_clicked();
+        bp->click();
     }
 
 }
\ No newline at end of file

core/properties/buttonproperty.cpp

@@ -41,4 +41,9 @@ namespace campvis {
     ButtonProperty::~ButtonProperty() {
     }
 
+    void ButtonProperty::click() {
+        s_clicked();
+        s_changed(this);
+    }
+
 }

core/properties/buttonproperty.h

@@ -51,6 +51,11 @@ namespace campvis {
          **/
         virtual ~ButtonProperty();
 
+        /**
+         * Simulates a click event.
+         */
+        void click();
+
         /**
          * Signal emitted when button was clicked.
          */

ext/tgt/openglgarbagecollector.cpp

@@ -45,8 +45,12 @@ namespace tgt {
 
     void OpenGLGarbageCollector::deleteGarbage() {
         tbb::spin_mutex::scoped_lock lock(_mutex);
-        size_t backIndex = _currentFrontindex;
-        _currentFrontindex = (_currentFrontindex+1) % 2;
+        size_t backIndex;
+        {
+            backIndex = _currentFrontindex;
+            tbb::spin_mutex::scoped_lock lock(_addMutex);
+            _currentFrontindex = (_currentFrontindex+1) % 2;
+        }
         
         // delete textures
         if (! _texturesToDelete[backIndex].empty()) {

modules/columbia/columbia.cmake

@@ -2,12 +2,14 @@
 
 # Source files:
 FILE(GLOB ThisModSources RELATIVE ${ModulesDir}
+	modules/columbia/datastructures/*.cpp
 	modules/columbia/pipelines/*.cpp
 	modules/columbia/processors/*.cpp
 )
 
 # Header files (including GLSL files so that they'll appear in VS projects)
 FILE(GLOB ThisModHeaders RELATIVE ${ModulesDir}
+    modules/columbia/datastructures/*.h
     modules/columbia/glsl/*.frag
     modules/columbia/glsl/*.vert
 	modules/columbia/pipelines/*.h

modules/columbia/datastructures/fiberdata.cpp

+// ================================================================================================
+// 
+// This file is part of the CAMPVis Software Framework.
+// 
+// If not explicitly stated otherwise: Copyright (C) 2012, all rights reserved,
+//      Christian Schulte zu Berge <christian.szb@in.tum.de>
+//      Chair for Computer Aided Medical Procedures
+//      Technische Universitt Mnchen
+//      Boltzmannstr. 3, 85748 Garching b. Mnchen, Germany
+// For a full list of authors and contributors, please refer to the file "AUTHORS.txt".
+// 
+// The licensing of this softare is not yet resolved. Until then, redistribution in source or
+// binary forms outside the CAMP chair is not permitted, unless explicitly stated in legal form.
+// However, the names of the original authors and the above copyright notice must retain in its
+// original state in any case.
+// 
+// Legal disclaimer provided by the BSD license:
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 
+// AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
+// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
+// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+// 
+// ================================================================================================
+
+#include "fiberdata.h"
+
+namespace campvis {
+
+    FiberData::FiberData() 
+        : AbstractData()
+    {
+    }
+
+    FiberData::~FiberData() {
+
+    }
+
+    void FiberData::addFiber(const std::deque<tgt::vec3>& vertices) {
+        _vertices.insert(_vertices.end(), vertices.begin(), vertices.end());
+        _fibers.push_back(Fiber(_vertices.size() - vertices.size(), _vertices.size()));
+    }
+
+    void FiberData::addFiber(const std::vector<tgt::vec3>& vertices) {
+        _vertices.insert(_vertices.end(), vertices.begin(), vertices.end());
+        _fibers.push_back(Fiber(_vertices.size() - vertices.size(), _vertices.size()));
+    }
+
+    void FiberData::clear() {
+        _fibers.clear();
+        _vertices.clear();
+    }
+
+    void FiberData::updateLengths() const {
+        for (size_t i = 0; i < _fibers.size(); ++i) {
+            _fibers[i]._length = 0.0f;
+
+            for (size_t j = _fibers[i]._startIndex + 1; j < _fibers[i]._endIndex; ++j)
+                _fibers[i]._length += distance(_vertices[j-1], _vertices[j]);
+        }
+    }
+
+    size_t FiberData::numFibers() const {
+        return _fibers.size();
+    }
+
+    size_t FiberData::numSegments() const {
+        size_t sum = 0;
+        for (std::vector<Fiber>::const_iterator it = _fibers.begin(); it != _fibers.end(); ++it) 
+            sum += (it->_endIndex - it->_startIndex);
+        return sum;
+    }
+
+
+    bool FiberData::empty() const {
+        return _fibers.empty();
+    }
+
+    FiberData* FiberData::clone() const {
+        FiberData* toReturn = new FiberData(*this);
+        return toReturn;
+    }
+
+    size_t FiberData::getLocalMemoryFootprint() const {
+        size_t sum = _vertices.size() * sizeof(tgt::vec3);
+        sum += _fibers.size() * sizeof(Fiber);
+        sum += sizeof(*this);
+        return sum;
+    }
+
+    size_t FiberData::getVideoMemoryFootprint() const {
+        return 0;
+    }
+
+}
\ No newline at end of file

modules/columbia/datastructures/fiberdata.h

+// ================================================================================================
+// 
+// This file is part of the CAMPVis Software Framework.
+// 
+// If not explicitly stated otherwise: Copyright (C) 2012, all rights reserved,
+//      Christian Schulte zu Berge <christian.szb@in.tum.de>
+//      Chair for Computer Aided Medical Procedures
+//      Technische Universität München
+//      Boltzmannstr. 3, 85748 Garching b. München, Germany
+// For a full list of authors and contributors, please refer to the file "AUTHORS.txt".
+// 
+// The licensing of this softare is not yet resolved. Until then, redistribution in source or
+// binary forms outside the CAMP chair is not permitted, unless explicitly stated in legal form.
+// However, the names of the original authors and the above copyright notice must retain in its
+// original state in any case.
+// 
+// Legal disclaimer provided by the BSD license:
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 
+// AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
+// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
+// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+// 
+// ================================================================================================
+
+#ifndef FIBERDATA_H__
+#define FIBERDATA_H__
+
+#include "tgt/vector.h"
+#include "core/datastructures/abstractdata.h"
+
+#include <deque>
+#include <vector>
+
+namespace campvis {
+
+    /**
+     * Data object storing fiber data.
+     */
+    class FiberData : public AbstractData {
+    public:
+        /**
+         * Struct storing meta information about a single fiber.
+         */
+        struct Fiber {
+            size_t _startIndex;     ///< Start index of the fiber
+            size_t _endIndex;       ///< End index of the fiber (as in STL iterators: points to the element _behind_ the last vertex)
+
+            mutable float _length;  ///< Length of the fiber (cached)
+            int _segmentId;         ///< Label of the fiber
+            bool _visible;          ///< Visibility flag of the fiber
+            bool _selected;         ///< Selected flag of the fiber
+
+            Fiber(size_t startIndex, size_t endIndex) 
+                : _startIndex(startIndex), _endIndex(endIndex), _length(0.f), _segmentId(0), _visible(true), _selected(false) 
+            {};
+        };
+
+
+        /**
+         * Constructor.
+         */
+        FiberData();
+
+        /**
+         * Destructor.
+         */
+        virtual ~FiberData();
+
+
+        /**
+         * Generates a new fiber from the given vertices and adds it to this data structure.
+         * \param   vertices    Coordinates of the fiber points.
+         */
+        void addFiber(const std::deque<tgt::vec3>& vertices);
+
+        /**
+         * Generates a new fiber from the given vertices and adds it to this data structure.
+         * \param   vertices    Coordinates of the fiber points.
+         */
+        void addFiber(const std::vector<tgt::vec3>& vertices);
+
+        /**
+         * Clears this data structure.
+         */
+        void clear();
+
+        /**
+         * Computes the lengths of each fiber in this data structure and stores it in the 
+         * corresponding field.
+         * \note    Since there is currently not automatism to do this, you're responsible to do 
+         *          this yourself when needed.
+         */
+        void updateLengths() const;
+
+        /**
+         * Returns the number of fibers in this data structure.
+         * \return  _fibers.size()
+         */
+        size_t numFibers() const;
+
+        /**
+         * Returns the number of fiber segments in this data structure.
+         * \return  (i.e. the number of vertices - number of fibers)
+         */
+        size_t numSegments() const;
+
+        /**
+         * Returns whether this data structure is empty (i.e. has no fibers).
+         */
+        bool empty() const;
+
+        
+        /// \see AbstractData::clone()
+        virtual FiberData* clone() const;
+
+        /// \see AbstractData::getLocalMemoryFootprint()
+        virtual size_t getLocalMemoryFootprint() const;
+
+        /// \see AbstractData::getVideoMemoryFootprint()
+        virtual size_t getVideoMemoryFootprint() const;
+
+    protected:
+        std::vector<tgt::vec3> _vertices;   ///< The fiber vertex (coordinates) data
+        std::vector<Fiber> _fibers;         ///< The fiber meta data
+
+    };
+
+}
+
+#endif // FIBERDATA_H__

modules/columbia/pipelines/columbia1.cpp

@@ -48,6 +48,7 @@ namespace campvis {
         , _sr(_effectiveRenderTargetSize)
         , _src(_effectiveRenderTargetSize)
         , _gr(_effectiveRenderTargetSize)
+        , _sft()
         , _trackballEH(0)
     {
         addProperty(&_camera);
@@ -58,10 +59,11 @@ namespace campvis {
         addProcessor(&_imageReader);
         addProcessor(&_vtkReader);
         addProcessor(&_splitter);
-        addProcessor(&_vr);
-        addProcessor(&_src);
+        //addProcessor(&_vr);
+        //addProcessor(&_src);
         addProcessor(&_sr);
         addProcessor(&_gr);
+        addProcessor(&_sft);
     }
 
     Columbia1::~Columbia1() {
@@ -80,10 +82,12 @@ namespace campvis {
         _vr.p_outputImage.setValue("vr");
         _sr.p_targetImageID.setValue("sr");
         _src.p_targetImageID.setValue("src");
-        _renderTargetID.setValue("vr");
+        _renderTargetID.setValue("sr");
 
-        _imageReader.p_url.setValue("D:/Medical Data/Columbia/inputs/FullVolumeLV_3D_25Hz_[IM_0004]_NIF_diffused_crop_00.ltf");
+        _imageReader.p_url.setValue("D:/Medical Data/Columbia/outputs/FullVolumeLV_3D_25Hz_[IM_0004]_NIF_crop_flow_field_00_00.ltf");
         _imageReader.p_size.setValue(tgt::ivec3(224, 176, 208));
+        _imageReader.p_numChannels.setValue(3);
+        _imageReader.p_baseType.selectById("float");
         _imageReader.p_targetImageID.setValue("reader.output");
         _imageReader.p_targetImageID.connect(&_splitter.p_inputID);
 
@@ -94,7 +98,8 @@ namespace campvis {
         _splitter.p_outputID.connect(&_vr.p_inputVolume);
         _splitter.p_outputID.connect(&_src.p_sourceImageID);
         _splitter.p_outputID.connect(&_sr.p_sourceImageID);
-
+        _splitter.p_outputID.connect(&_sft.p_strainId);
+         
         Geometry1DTransferFunction* dvrTF = new Geometry1DTransferFunction(128, tgt::vec2(0.f, 1.f));
         dvrTF->addGeometry(TFGeometry1D::createQuad(tgt::vec2(.1f, .125f), tgt::col4(255, 0, 0, 32), tgt::col4(255, 0, 0, 32)));
         dvrTF->addGeometry(TFGeometry1D::createQuad(tgt::vec2(.4f, .5f), tgt::col4(0, 255, 0, 128), tgt::col4(0, 255, 0, 128)));
@@ -102,6 +107,8 @@ namespace campvis {
 
         _gr.p_renderTargetID.setValue("gr");
 
+        _sft.p_outputID.setValue("fibers");
+
         _trackballEH->setViewportSize(_effectiveRenderTargetSize.getValue());
         _effectiveRenderTargetSize.s_changed.connect<Columbia1>(this, &Columbia1::onRenderTargetSizeChanged);
     }

modules/columbia/pipelines/columbia1.h

@@ -39,6 +39,7 @@
 #include "modules/io/processors/vtkimagereader.h"
 #include "modules/columbia/processors/geometrystrainrenderer.h"
 #include "modules/columbia/processors/imageseriessplitter.h"
+#include "modules/columbia/processors/strainfibertracker.h"
 #include "modules/columbia/processors/strainraycaster.h"
 #include "modules/vis/processors/geometryrenderer.h"
 #include "modules/vis/processors/sliceextractor.h"
@@ -87,6 +88,8 @@ namespace campvis {
         SliceExtractor _sr;
         GeometryRenderer _gr;
 
+        StrainFiberTracker _sft;
+
         TrackballNavigationEventHandler* _trackballEH;
 
     };

modules/columbia/processors/strainfibertracker.cpp

+// ================================================================================================
+// 
+// This file is part of the CAMPVis Software Framework.
+// 
+// If not explicitly stated otherwise: Copyright (C) 2012, all rights reserved,
+//      Christian Schulte zu Berge <christian.szb@in.tum.de>
+//      Chair for Computer Aided Medical Procedures
+//      Technische Universitt Mnchen
+//      Boltzmannstr. 3, 85748 Garching b. Mnchen, Germany
+// For a full list of authors and contributors, please refer to the file "AUTHORS.txt".
+// 
+// The licensing of this softare is not yet resolved. Until then, redistribution in source or
+// binary forms outside the CAMP chair is not permitted, unless explicitly stated in legal form.
+// However, the names of the original authors and the above copyright notice must retain in its
+// original state in any case.
+// 
+// Legal disclaimer provided by the BSD license:
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 
+// AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
+// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
+// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+// 
+// ================================================================================================
+
+#include "strainfibertracker.h"
+
+#include "tbb/tbb.h"
+#include "tbb/spin_mutex.h"
+
+#include "core/datastructures/imagerepresentationlocal.h"
+#include "modules/columbia/datastructures/fiberdata.h"
+#include <deque>
+
+namespace campvis {
+    const std::string StrainFiberTracker::loggerCat_ = "CAMPVis.modules.io.StrainFiberTracker";
+
+    class ApplyFiberTracking {
+    public:
+        ApplyFiberTracking(const ImageRepresentationLocal* input, const std::vector<tgt::vec3>& seeds, FiberData* output, int numSteps, float stepSize, float strainThreshold, float maximumAngle, tbb::spin_mutex& mutex)
+            : _input(input)
+            , _seeds(seeds)
+            , _output(output)
+            , _numSteps(numSteps)
+            , _stepSize(stepSize)
+            , _strainThreshold(strainThreshold * strainThreshold)
+            , _maxAngle(maximumAngle)
+            , _mutex(mutex)
+        {
+            _voxelSize = tgt::length(_input->getParent()->getMappingInformation().getVoxelSize());
+        }
+        
+        /**
+         * Retrieves a vec3 from \a vol using trilinear interpolation.
+         * \param   position        voxel position
+         **/
+        inline tgt::vec3 getVec3FloatLinear(const tgt::vec3& position) const {
+            tgt::vec3 result;
+            result.x = _input->getElementNormalizedLinear(position, 0);
+            result.y = _input->getElementNormalizedLinear(position, 1);
+            result.z = _input->getElementNormalizedLinear(position, 2);
+            return result;
+        }
+        
+        /**
+         * Checks whether the angle between \a a and \a b is lower that the given threshold.
+         *
+         * \param   a   direction of first tangent vector in world coordinates
+         * \param   b   direction of second tangent vector in world coordinates
+         *
+         * \return  true, if angle is below the threshold.
+         **/
+        inline bool testTortuosity(const tgt::vec3& a, const tgt::vec3& b) const {
+            float angle = fabs(acos(tgt::dot(a, b) / (tgt::length(a) * tgt::length(b))));
+            return (angle < _maxAngle);
+        }
+
+        /**
+         * Checks whether \a position is within volume bounds.
+         *
+         * \param   position    position in voxel coordinates
+         *
+         * true, if \a position is within bounds of eigenvalues volume.
+         **/
+        inline bool testBounds(const tgt::vec3& position) const {
+            const tgt::svec3& dim = _input->getParent()->getSize();
+            tgt::svec3 pos(tgt::ceil(position));
+            return (tgt::hand(tgt::greaterThanEqual(pos, tgt::svec3::zero)) && tgt::hand(tgt::lessThanEqual(pos, dim)));
+        }
+        /**
+         * Performs fiber tracking of a single fiber to a single direction starting at \a worldPosition 
+         * and stores path in \a result. \a result will NOT contain the start point \a worldPosition.
+         *
+         * \param   worldPosition   start position in world coordinates
+         * \param   forwards        flag whether to propagate forwards or backwards from \a worldPosition
+         * \param   maxAngle        maximum angle between two fiber points to continue tracking
+         * \param   result          fiber points will be stored in here - forward tracking will append, backward tracking push front
+         **/
+        void performSingleTracking(tgt::vec3 worldPosition, bool forwards, std::deque<tgt::vec3>& result) const {
+            const tgt::mat4& WtV = _input->getParent()->getMappingInformation().getWorldToVoxelMatrix();
+
+            tgt::vec3 voxelPosition = (WtV * tgt::vec4(worldPosition, 1.f)).xyz();
+            tgt::vec3 direction = getVec3FloatLinear(voxelPosition);
+            if (! forwards)
+                direction *= -1.f;
+
+            for (int i = 0; i < _numSteps; ++i) {
+                // apply second order runge-kutta integration (Heun method)
+                tgt::vec3 dir1 = getVec3FloatLinear((WtV * tgt::vec4(worldPosition, 1.f)).xyz()) * _stepSize * _voxelSize;
+                if (tgt::dot(direction, dir1) < 0)
+                    dir1 *= -1.f;
+
+                tgt::vec3 dir2 = getVec3FloatLinear((WtV * tgt::vec4(worldPosition + dir1, 1.f)).xyz()) * _stepSize * _voxelSize;
+                if (tgt::dot(direction, dir2) < 0)
+                    dir2 *= -1.f;
+
+                tgt::vec3 vProp = (dir1 + dir2) * .5f;
+                worldPosition += vProp;
+                voxelPosition = (WtV * tgt::vec4(worldPosition, 1.f)).xyz();
+
+                // check termination criteria
+                if (tgt::lengthSq(vProp) < _strainThreshold || !testBounds(voxelPosition) || !testTortuosity(direction, vProp))
+                    break;
+
+                direction = vProp;
+                if (forwards)
+                    result.push_back(worldPosition);
+                else
+                    result.push_front(worldPosition);
+            }
+        }
+
+        void operator() (const tbb::blocked_range<size_t>& range) const {
+            for (size_t i = range.begin(); i != range.end(); ++i) {
+                const tgt::vec3& position = _seeds[i];
+
+                // perform fiber tracking in both directions
+                std::deque<tgt::vec3> vertices;
+                performSingleTracking(position, false, vertices);
+                vertices.push_back(position);
+                performSingleTracking(position, true, vertices);
+
+                if (vertices.size() > 1) {
+                    tbb::spin_mutex::scoped_lock lock(_mutex);
+                    _output->addFiber(vertices);
+                }
+            }
+        }
+
+    protected:
+        const ImageRepresentationLocal* _input;
+        const std::vector<tgt::vec3>& _seeds;
+        FiberData* _output;
+        int _numSteps;
+        float _stepSize;
+        float _voxelSize;
+        float _strainThreshold;
+        float _maxAngle;
+
+        tbb::spin_mutex& _mutex;
+    };
+
+    StrainFiberTracker::StrainFiberTracker() 
+        : AbstractProcessor()
+        , p_strainId("StrainId", "Input Strain Data", "input", DataNameProperty::READ, AbstractProcessor::VALID)
+        , p_outputID("OutputId", "Output Fiber Data", "output", DataNameProperty::WRITE, AbstractProcessor::VALID)
+        , p_updateButton("UpdateButton", "Perform Tracking")
+        , p_numSteps("NumSteps", "Maximum Number of Steps", 256, 16, 1024, AbstractProcessor::VALID)
+        , p_stepSize("StepSize", "Base Step Size", 1.f, .01f, 10.f, AbstractProcessor::VALID)
+        , p_strainThreshold("StrainThreshold", "Local Strain Threshold", .5f, .1f, 1.f, AbstractProcessor::VALID)
+        , p_maximumAngle("MaximumAngle", "Maxium Angle", 25.f, 0.f, 100.f, AbstractProcessor::VALID)
+    {
+        addProperty(&p_strainId);
+        addProperty(&p_outputID);
+        addProperty(&p_updateButton);
+        addProperty(&p_numSteps);
+        addProperty(&p_stepSize);
+        addProperty(&p_strainThreshold);
+        addProperty(&p_maximumAngle);
+
+    }
+
+    StrainFiberTracker::~StrainFiberTracker() {
+
+    }
+
+    void StrainFiberTracker::process(DataContainer& data) {
+        ImageRepresentationLocal::ScopedRepresentation strainData(data, p_strainId.getValue());
+
+        if (strainData != 0) {
+            if (strainData.getImageData()->getNumChannels() == 3) {
+                LDEBUG("Generating seeds...");
+                std::vector<tgt::vec3> seeds = performUniformSeeding(*strainData);
+
+                LDEBUG("Generating fibers...");
+                FiberData* fibers = new FiberData();
+                tbb::spin_mutex mutex;
+                tbb::parallel_for(
+                    tbb::blocked_range<size_t>(0, seeds.size()), 
+                    ApplyFiberTracking(strainData, seeds, fibers, p_numSteps.getValue(), p_stepSize.getValue(), p_strainThreshold.getValue(), p_maximumAngle.getValue(), mutex));
+
+                LDEBUG("done.");
+
+                data.addData(p_outputID.getValue(), fibers);
+                p_outputID.issueWrite();
+            }
+            else {
+                LERROR("Wrong number of channels.");
+            }
+        }
+        else {
+            LERROR("No input data.");
+        }
+
+        validate(INVALID_RESULT);
+    }
+
+    std::vector<tgt::vec3> StrainFiberTracker::performUniformSeeding(const ImageRepresentationLocal& strainData) const {
+        std::vector<tgt::vec3> seeds;
+        const tgt::mat4& VtW = strainData.getParent()->getMappingInformation().getVoxelToWorldMatrix();
+        float threshold = p_strainThreshold.getValue() * p_strainThreshold.getValue();