Introducing an advanced optimized ray caster that allows for empty space skipping.

Merged Morteza's changes into one single commit.

modules/vis/advraycaster/VoxelTextureMipMapping.cpp

+// ================================================================================================
+// 
+// This file is part of the CAMPVis Software Framework.
+// 
+// If not explicitly stated otherwise: Copyright (C) 2012-2013, 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".
+// 
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file 
+// except in compliance with the License. You may obtain a copy of the License at
+// 
+// http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software distributed under the 
+// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, 
+// either express or implied. See the License for the specific language governing permissions 
+// and limitations under the License.
+// 
+// ================================================================================================
+
+#include "VoxelTextureMipMapping.h"
+
+#include "tgt/shadermanager.h"
+#include "tgt/textureunit.h"
+#include "tgt/tgt_gl.h"
+
+#include "core/datastructures/geometrydatafactory.h"
+
+#define VOXEL_DEPTH_MIPMAPPING 32
+
+namespace campvis {
+    VoxelTexMipMapGenerator::VoxelTexMipMapGenerator() {   
+        _quad = GeometryDataFactory::createQuad(tgt::vec3(0.f), tgt::vec3(1.f), tgt::vec3(1.f, 1.f, 0.f), tgt::vec3(0.f, 0.f, 0.f));
+        _shader = ShdrMgr.loadWithCustomGlslVersion("core/glsl/passthrough.vert", "", "modules/vis/advraycaster/glsl/MipmapVoxelTexture.frag", "", "330");        
+    }
+
+    void VoxelTexMipMapGenerator::init() {
+    }
+
+    unsigned int VoxelTexMipMapGenerator::computeMaxLevel(unsigned int resolutionX, unsigned int resolutionY) {
+        unsigned int count = 0;
+
+        unsigned int resolution = std::max(resolutionX, resolutionY);
+
+        while(resolution){
+            resolution /= 2;
+            count++;
+        }
+        return count-1;
+    }
+
+    void VoxelTexMipMapGenerator::attachMipmapsTo(tgt::Texture* texture, unsigned int resolutionX, unsigned int resolutionY) {
+        unsigned int maxLevel = computeMaxLevel(resolutionX, resolutionY);
+       
+        LGL_ERROR;
+
+        // attach mipmap levels to this voxel texture
+        glBindTexture(GL_TEXTURE_2D, texture->getId());
+        
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
+        LGL_ERROR;
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+        LGL_ERROR;
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
+        LGL_ERROR;
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, maxLevel);  
+
+        LGL_ERROR;
+
+        int div = 2;
+        for(unsigned int level = 1; level <= maxLevel; level++){
+#if (VOXEL_DEPTH_MIPMAPPING == 8)
+            glTexImage2D(GL_TEXTURE_2D, level, GL_R32UI, resolutionX/div, resolutionY/div, 0, GL_RED_INTEGER_EXT, GL_UNSIGNED_BYTE, 0);
+#else if (VOXEL_DEPTH_MIPMAPPING == 32)
+            glTexImage2D(GL_TEXTURE_2D, level, GL_R32UI, resolutionX/div, resolutionY/div, 0, GL_RED_INTEGER, GL_UNSIGNED_INT, 0);
+#endif
+            div = div << 1;
+            LGL_ERROR;
+        }
+    }
+
+    void VoxelTexMipMapGenerator::renderMipmapsFor(tgt::Texture* texture, unsigned int resolutionX, unsigned int resolutionY, unsigned int voxelSize) {
+        glPushAttrib(GL_ALL_ATTRIB_BITS);
+        LGL_ERROR;
+
+        unsigned int maxLevel = computeMaxLevel(resolutionX, resolutionY);
+        
+        tgt::FramebufferObject frameBuffer;
+
+        LGL_ERROR;
+        /// Activate the shader for geometry Rendering.
+        _shader->activate();
+
+       tgt::TextureUnit bbvUnit;
+       bbvUnit.activate();
+       texture->bind();
+       LGL_ERROR;
+       _shader->setIgnoreUniformLocationError(true);
+           _shader->setUniform("_voxelTexture", bbvUnit.getUnitNumber());
+           LGL_ERROR;
+           _shader->setUniform("_voxelTextureParams._size", tgt::vec2(static_cast<float>(texture->getDimensions().r), static_cast<float>(texture->getDimensions().g)));
+           LGL_ERROR;
+           _shader->setUniform("_voxelTextureParams._sizeRCP", tgt::vec3(1.f) / tgt::vec3(texture->getDimensions()));
+           LGL_ERROR;
+           _shader->setUniform("_voxelTextureParams._numChannels", static_cast<int>(1));
+           LGL_ERROR;
+       _shader->setIgnoreUniformLocationError(false);
+        LGL_ERROR;
+       frameBuffer.activate();
+
+       // Set OpenGL pixel alignment to 1 to avoid problems with NPOT textures
+       glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+       for(unsigned int i = 0; i < maxLevel; i++){  
+           // Set OpenGL pixel alignment to 1 to avoid problems with NPOT textures
+           glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+           tgt::mat4 projection = tgt::mat4::createOrtho(0, 1, 0, 1, -1, 1);
+           _shader->setUniform("_projectionMatrix", projection);
+
+           _shader->setUniform("_level", static_cast<int>(i));
+           float invResXFloat = static_cast<float>( 1.0/(resolutionX/pow(2.0,double(i))) );
+           float invResYFloat = static_cast<float>( 1.0/(resolutionY/pow(2.0,double(i))) );
+           _shader->setUniform("_inverseTexSizeX", static_cast<float>(invResXFloat));
+           _shader->setUniform("_inverseTexSizeY", static_cast<float>(invResYFloat));
+           LGL_ERROR;
+
+           glViewport(0, 0, static_cast<GLsizei>(resolutionX/pow(2.0,double(i+1))), static_cast<GLsizei>(resolutionY/pow(2.0,double(i+1))));
+
+           frameBuffer.attachTexture(texture, GL_COLOR_ATTACHMENT0, i+1, 0);
+           frameBuffer.isComplete();
+
+           LGL_ERROR;
+           _quad->render(GL_POLYGON);
+           LGL_ERROR;
+        }
+
+        _shader->deactivate();    
+        frameBuffer.deactivate();
+
+        glPopAttrib();
+        LGL_ERROR;
+    }
+
+    VoxelTexMipMapGenerator::~VoxelTexMipMapGenerator() {
+        ShdrMgr.dispose(_shader);
+        delete _quad;
+    }
+}
\ No newline at end of file

modules/vis/advraycaster/VoxelTextureMipMapping.h

+// ================================================================================================
+// 
+// This file is part of the CAMPVis Software Framework.
+// 
+// If not explicitly stated otherwise: Copyright (C) 2012-2013, 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".
+// 
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file 
+// except in compliance with the License. You may obtain a copy of the License at
+// 
+// http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software distributed under the 
+// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, 
+// either express or implied. See the License for the specific language governing permissions 
+// and limitations under the License.
+// 
+// ================================================================================================
+
+#ifndef VOXELTEXTUREMIPMAPPER_H__
+#define VOXELTEXTUREMIPMAPPER_H__
+
+#include <string>
+
+#include "ext/glew/include/GL/glew.h"
+#include "tgt/framebufferobject.h"
+#include "tgt/shadermanager.h"
+#include "tgt/texture.h"
+#include "core/datastructures/facegeometry.h"
+
+namespace campvis {
+    /**
+     * class for generating the mip maps of the voxel texture
+     *
+     */
+    class VoxelTexMipMapGenerator {
+    public:
+        /**
+         * Creates a VoxelTexMipMapGenerator and prepare the framebuffer and shader for next function calls of the object.
+         */
+        VoxelTexMipMapGenerator();
+
+        void init();
+
+        /**
+         * Computes the maximum level of mipmapping.
+         * \param   resolution                  largest dimension of the voxelized volume.
+         */
+        unsigned int computeMaxLevel(unsigned int resolutionX, unsigned int resolutionY);
+        
+        /**
+         * Attaches the mipmaps to the texture with the passed textureID and resolution.
+         * \param   voxelTextureID              ID of the texture which the mip maps are going to be attached to.
+         * \param   resolution                  largest dimension of the voxelized volume.
+         */
+        void attachMipmapsTo(tgt::Texture* texture, unsigned int resolutionX, unsigned int resolutionY);
+        
+        /**
+         * renders the mipmaps of the texture with the passed texture object and resolution.
+         * \param   voxelTextureID              texture object.
+         * \param   resolution                  largest dimension of the voxelized volume.
+         */
+        void renderMipmapsFor(tgt::Texture* texture, unsigned int resolution, unsigned int resolutionY, unsigned int voxelSize);
+
+        ~VoxelTexMipMapGenerator();
+    private:
+        tgt::Shader* _shader;           ///< Pointer to the shader object
+        FaceGeometry* _quad;
+    };
+
+}
+
+#endif // VOXELTEXTUREMIPMAPPER_H__

modules/vis/advraycaster/advoptimizedraycaster.cpp

+// ================================================================================================
+// 
+// This file is part of the CAMPVis Software Framework.
+// 
+// If not explicitly stated otherwise: Copyright (C) 2012-2013, 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".
+// 
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file 
+// except in compliance with the License. You may obtain a copy of the License at
+// 
+// http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software distributed under the 
+// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, 
+// either express or implied. See the License for the specific language governing permissions 
+// and limitations under the License.
+// 
+// ================================================================================================
+
+#include "AdvOptimizedRaycaster.h"
+
+#include "core/tools/quadrenderer.h"
+#include "core/datastructures/renderdata.h"
+#include "core/pipeline/processordecoratorshading.h"
+#include "core/datastructures/imagedata.h"
+#include "core/datastructures/geometrydatafactory.h"
+
+#include "modules/vis/advraycaster/voxeltexturemipmapping.h"
+
+#include <tbb/tbb.h>
+
+namespace campvis {
+    const std::string AdvOptimizedRaycaster::loggerCat_ = "CAMPVis.modules.vis.AdvOptimizedRaycaster";
+
+    AdvOptimizedRaycaster::AdvOptimizedRaycaster(IVec2Property* viewportSizeProp)
+        : RaycastingProcessor(viewportSizeProp, "modules/vis/advraycaster/glsl/AdvOptimizedRaycaster.frag", true, "400")
+        , p_targetImageID("targetImageID", "Output Image", "", DataNameProperty::WRITE)
+        , p_enableShadowing("EnableShadowing", "Enable Hard Shadows (Expensive!)", false, AbstractProcessor::INVALID_RESULT | AbstractProcessor::INVALID_SHADER | AbstractProcessor::INVALID_PROPERTIES)
+        , p_shadowIntensity("ShadowIntensity", "Shadow Intensity", .5f, .0f, 1.f)
+        , p_enableIntersectionRefinement("EnableIntersectionRefinement", "Enable Intersection Refinement", false, AbstractProcessor::INVALID_RESULT | AbstractProcessor::INVALID_SHADER)
+        , p_useEmptySpaceSkipping("EnableEmptySpaceSkipping", "Enable Empty Space Skipping", true, AbstractProcessor::INVALID_RESULT | INVALID_BBV)
+        , _vv(0)
+        , _quad(0)
+        , _voxelGeneratorShdr(0)
+        , _vvTex(0)
+        , _mipMapGen(0)
+    {
+        addDecorator(new ProcessorDecoratorShading());
+
+        addProperty(&p_targetImageID);
+        addProperty(&p_enableIntersectionRefinement);
+        addProperty(&p_useEmptySpaceSkipping);
+
+        addProperty(&p_enableShadowing);
+        addProperty(&p_shadowIntensity);
+        p_shadowIntensity.setVisible(false);
+
+        p_transferFunction.setInvalidationLevel(p_transferFunction.getInvalidationLevel() | INVALID_BBV);
+         p_sourceImageID.setInvalidationLevel(p_sourceImageID.getInvalidationLevel() | INVALID_BBV);
+
+        decoratePropertyCollection(this);
+    }
+
+    AdvOptimizedRaycaster::~AdvOptimizedRaycaster() {
+    }
+
+    void AdvOptimizedRaycaster::init() {
+        RaycastingProcessor::init();
+
+        _quad = GeometryDataFactory::createQuad(tgt::vec3(0.f), tgt::vec3(1.f), tgt::vec3(1.f, 1.f, 0.f), tgt::vec3(0.f, 0.f, 0.f));
+        _voxelGeneratorShdr = ShdrMgr.loadWithCustomGlslVersion("core/glsl/passthrough.vert", "", "modules/vis/advraycaster/glsl/rendervolumevoxelizing.frag", "", "400");
+
+        invalidate(INVALID_BBV);
+    }
+
+    void AdvOptimizedRaycaster::deinit() {
+        delete _vv;
+        delete _vvTex;
+        RaycastingProcessor::deinit();
+    }
+
+    void AdvOptimizedRaycaster::processImpl(DataContainer& data, ImageRepresentationGL::ScopedRepresentation& image) {
+        tgt::TextureUnit bbvUnit;
+
+        if (getInvalidationLevel() & INVALID_BBV){
+
+            renderVv(data);
+
+            validate(INVALID_BBV);
+            _shader->activate();
+        }
+        
+        if (_vvTex != 0 && p_useEmptySpaceSkipping.getValue()){
+            // bind
+            bbvUnit.activate();
+            _vvTex->bind();
+            _shader->setIgnoreUniformLocationError(true);
+            _shader->setUniform("_vvTexture", bbvUnit.getUnitNumber());
+            _shader->setUniform("_vvTextureParams._size", tgt::vec3(_vvTex->getDimensions()));
+            _shader->setUniform("_vvTextureParams._sizeRCP", tgt::vec3(1.f) / tgt::vec3(_vvTex->getDimensions()));
+            _shader->setUniform("_vvTextureParams._numChannels", static_cast<int>(1));
+
+            _shader->setUniform("_vvVoxelSize", static_cast<int>(_vv->getBrickSize()));
+            _shader->setUniform("_vvVoxelDepth", static_cast<int>(_vv->getBrickDepth()));
+            _shader->setUniform("_hasVv", true);
+
+            _shader->setUniform("_vvMaxMipMapLevel", _maxMipMapLevel);
+
+            _shader->setIgnoreUniformLocationError(false);
+        } else {
+            _shader->setUniform("_hasVv", false);
+        }
+
+        FramebufferActivationGuard fag(this);
+        createAndAttachTexture(GL_RGBA8);
+        createAndAttachTexture(GL_RGBA32F);
+        createAndAttachTexture(GL_RGBA32F);
+        createAndAttachDepthTexture();
+
+        static const GLenum buffers[] = { GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1 , GL_COLOR_ATTACHMENT2 };
+        glDrawBuffers(3, buffers);
+
+        if (p_enableShadowing.getValue())
+            _shader->setUniform("_shadowIntensity", p_shadowIntensity.getValue());
+
+        glEnable(GL_DEPTH_TEST);
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+        QuadRdr.renderQuad();
+
+        glDisable(GL_DEPTH_TEST);
+        LGL_ERROR;
+
+        glDrawBuffers(1, buffers);
+
+        data.addData(p_targetImageID.getValue(), new RenderData(_fbo)); 
+    }
+
+    std::string AdvOptimizedRaycaster::generateHeader() const {
+        std::string toReturn = RaycastingProcessor::generateHeader();
+        if (p_enableShadowing.getValue())
+            toReturn += "#define ENABLE_SHADOWING\n";
+        if (p_enableIntersectionRefinement.getValue())
+            toReturn += "#define INTERSECTION_REFINEMENT\n";
+        return toReturn;
+    }
+
+    void AdvOptimizedRaycaster::updateProperties() {
+        p_shadowIntensity.setVisible(p_enableShadowing.getValue());
+        validate(AbstractProcessor::INVALID_PROPERTIES);
+    }
+
+    void AdvOptimizedRaycaster::renderVv(DataContainer& data) {
+        delete _vv;
+        _vv = 0;
+        delete _vvTex;
+        _vvTex = 0;
+        delete _mipMapGen;
+        _mipMapGen = 0;
+
+        ImageRepresentationGL::ScopedRepresentation img(data, p_sourceImageID.getValue());
+
+        if (img != 0){
+            _vv = new VoxelizedRenderVolume(img->getParent(), 4);
+            _vvTex = _vv->createEmptyImageData();
+            _mipMapGen = new VoxelTexMipMapGenerator();
+            
+            LDEBUG("Start computing voxel visibilities...");
+                
+            glPushAttrib(GL_ALL_ATTRIB_BITS);
+
+            tgt::FramebufferObject frameBuffer;
+
+            LGL_ERROR;
+            /// Activate the shader to generate the voxelized volume.
+            _voxelGeneratorShdr->activate();
+
+            tgt::TextureUnit volumeUnit, tfUnit;
+            volumeUnit.activate();
+            tfUnit.activate();
+
+            LGL_ERROR;
+            _voxelGeneratorShdr->setIgnoreUniformLocationError(true);
+                img->bind(_voxelGeneratorShdr, volumeUnit, "_volume", "_volumeTextureParams");
+                p_transferFunction.getTF()->bind(_voxelGeneratorShdr, tfUnit, "_transferFunction", "_transferFunctionParams");
+                _voxelGeneratorShdr->setUniform("_voxelDepth", static_cast<unsigned int>(_vv->getBrickDepth()));
+                _voxelGeneratorShdr->setUniform("_voxelSize", static_cast<unsigned int>(_vv->getBrickSize()));
+            _voxelGeneratorShdr->setIgnoreUniformLocationError(false);
+            LGL_ERROR;
+            frameBuffer.activate();
+
+            // Set OpenGL pixel alignment to 1 to avoid problems with NPOT textures
+            glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+            tgt::mat4 projection = tgt::mat4::createOrtho(0, 1, 0, 1, -1, 1);
+            _voxelGeneratorShdr->setUniform("_projectionMatrix", projection);
+
+            LGL_ERROR;
+                    
+            //write to:
+            glViewport(0, 0, static_cast<GLsizei>(_vvTex->getWidth()), static_cast<GLsizei>(_vvTex->getHeight()));
+
+            frameBuffer.attachTexture(_vvTex, GL_COLOR_ATTACHMENT0, 0, 0);
+            frameBuffer.isComplete();
+
+            LGL_ERROR;
+            _quad->render(GL_POLYGON);
+            LGL_ERROR;
+
+            _shader->deactivate();    
+            frameBuffer.deactivate();
+
+            glPopAttrib();
+
+            LDEBUG("...finished computing voxel visibilities.");
+                    
+            LGL_ERROR;
+            LDEBUG("Start computing the levels of the voxel object.");
+                    
+            _mipMapGen->attachMipmapsTo(_vvTex, _vv->getWidth(), _vv->getHeight());
+            _mipMapGen->renderMipmapsFor(_vvTex, _vv->getWidth(), _vv->getHeight(), _vv->getBrickSize());
+            _maxMipMapLevel = _mipMapGen->computeMaxLevel(_vv->getWidth(), _vv->getHeight());
+                   
+
+            LDEBUG("...finished computing voxel visibilities mip maps.");
+
+        }
+    }
+}

modules/vis/advraycaster/advoptimizedraycaster.h

+// ================================================================================================
+// 
+// This file is part of the CAMPVis Software Framework.
+// 
+// If not explicitly stated otherwise: Copyright (C) 2012-2013, 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".
+// 
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file 
+// except in compliance with the License. You may obtain a copy of the License at
+// 
+// http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software distributed under the 
+// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, 
+// either express or implied. See the License for the specific language governing permissions 
+// and limitations under the License.
+// 
+// ================================================================================================
+
+#ifndef AdvOptimizedRaycaster_H__
+#define AdvOptimizedRaycaster_H__
+
+#include "core/pipeline/raycastingprocessor.h"
+#include "core/properties/floatingpointproperty.h"
+#include "core/properties/genericproperty.h"
+#include "core/properties/transferfunctionproperty.h"
+#include "modules/vis/advraycaster/rendervolumeVoxelizing.h"
+#include "modules/vis/advraycaster/VoxelTextureMipMapping.h"
+
+#include <string>
+
+namespace tgt {
+    class Shader;
+}
+
+namespace campvis {
+    /**
+     * Performs ray casting using acceleration data structure. Also, the number of control instructions which is used is reduced to increase the execution performance on the gpu.
+     * The method is similar to [THGM11] paper. First, the data to be rendered is voxelized and stored in a 2D texture (each element of the texture is a 32-bit int. So, each element of the texture 
+     * can store 32 ). Then, a hierarchy is generated to increase the ray-rendering
+     * [THGM11] Sinje Thiedemann, Niklas Henrich, Thorsten Grosch, and Stefan Müller. 2011. Voxel-based global illumination. In Symposium on Interactive 3D Graphics and Games (I3D '11). ACM, New York, NY, USA, 103-110. DOI=10.1145/1944745.1944763 http://doi.acm.org/10.1145/1944745.1944763
+     */
+    class AdvOptimizedRaycaster : public RaycastingProcessor {
+    public:
+        enum AdditionalInvalidationLevels {
+            INVALID_BBV = AbstractProcessor::FIRST_FREE_TO_USE_INVALIDATION_LEVEL
+        };
+
+        /**
+         * Constructs a new AdvOptimizedRaycaster Processor
+         **/
+        AdvOptimizedRaycaster(IVec2Property* viewportSizeProp);
+
+        /**
+         * Destructor
+         **/
+        virtual ~AdvOptimizedRaycaster();
+
+        /// \see AbstractProcessor::getName()
+        virtual const std::string getName() const { return "AdvOptimizedRaycaster"; };
+        /// \see AbstractProcessor::getDescription()
+        virtual const std::string getDescription() const { return "Performs advanced ray casting to render sparse and big volumes faster."; };
+        /// \see AbstractProcessor::getAuthor()
+        virtual const std::string getAuthor() const { return "Morteza Mostajab <mostajab@in.tum.de>"; };
+        /// \see AbstractProcessor::getProcessorState()
+        virtual ProcessorState getProcessorState() const { return AbstractProcessor::EXPERIMENTAL; };
+
+        /// \see AbstractProcessor::init
+        virtual void init();
+        /// \see AbstractProcessor::deinit
+        virtual void deinit();
+
+        DataNameProperty p_targetImageID;    ///< image ID for output image
+        BoolProperty p_enableShadowing;
+        FloatProperty p_shadowIntensity;
+        BoolProperty p_enableIntersectionRefinement;
+
+        BoolProperty p_useEmptySpaceSkipping;
+    
+    protected:
+        /// \see HasProperyCollection::updateProperties()
+        virtual void updateProperties();
+
+        /// \see RaycastingProcessor::processImpl()
+        virtual void processImpl(DataContainer& data, ImageRepresentationGL::ScopedRepresentation& image);
+
+        /// \see RaycastingProcessor::generateHeader()
+        virtual std::string generateHeader() const;
+
+        /// Renders the voxelized volume
+        void renderVv(DataContainer& dh); 
+
+        VoxelTexMipMapGenerator* _mipMapGen;    //!< Voxel Texture Mip Map Generator
+        int _maxMipMapLevel;
+        VoxelizedRenderVolume* _vv;             //!< Voxelized Render volume
+        tgt::Texture* _vvTex;                   //!< Generated 2D Texture 
+
+
+        FaceGeometry* _quad;
+        tgt::Shader* _voxelGeneratorShdr;
+
+        static const std::string loggerCat_;
+    };
+
+}
+
+#endif // AdvOptimizedRaycaster_H__

modules/vis/advraycaster/glsl/MipmapVoxelTexture.frag

+// ================================================================================================
+// 
+// This file is part of the CAMPVis Software Framework.
+// 
+// If not explicitly stated otherwise: Copyright (C) 2012-2013, 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".
+// 
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file 
+// except in compliance with the License. You may obtain a copy of the License at