494 lines
16 KiB
C++
494 lines
16 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2009 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#include <osgVolume/RayTracedTechnique>
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#include <osgVolume/VolumeTile>
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#include <osg/Geometry>
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#include <osg/io_utils>
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#include <osg/Program>
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#include <osg/TexGen>
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#include <osg/Texture1D>
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#include <osg/Texture2D>
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#include <osg/Texture3D>
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#include <osg/TransferFunction>
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#include <osgDB/ReadFile>
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using namespace osgVolume;
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RayTracedTechnique::RayTracedTechnique()
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{
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}
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RayTracedTechnique::RayTracedTechnique(const RayTracedTechnique& fft,const osg::CopyOp& copyop):
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VolumeTechnique(fft,copyop)
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{
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}
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RayTracedTechnique::~RayTracedTechnique()
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{
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}
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enum ShadingModel
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{
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Standard,
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Light,
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Isosurface,
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MaximumIntensityProjection
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};
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void RayTracedTechnique::init()
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{
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osg::notify(osg::NOTICE)<<"RayTracedTechnique::init()"<<std::endl;
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if (!_volumeTile) return;
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ShadingModel shadingModel = Isosurface;
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float alphaFuncValue = 0.1;
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_geode = new osg::Geode;
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osg::Image* image_3d = 0;
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osg::TransferFunction1D* tf = 0;
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osgVolume::Locator* masterLocator = _volumeTile->getLocator();
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image_3d = _volumeTile->getLayer()->getImage();
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CollectPropertiesVisitor cpv;
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if (_volumeTile->getLayer()->getProperty())
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{
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_volumeTile->getLayer()->getProperty()->accept(cpv);
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}
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if (cpv._isoProperty.valid())
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{
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shadingModel = Isosurface;
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alphaFuncValue = cpv._isoProperty->getValue();
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}
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else if (cpv._mipProperty.valid())
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{
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shadingModel = MaximumIntensityProjection;
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}
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else if (cpv._lightingProperty.valid())
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{
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shadingModel = Light;
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}
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else
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{
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shadingModel = Standard;
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}
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if (cpv._tfProperty.valid())
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{
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tf = dynamic_cast<osg::TransferFunction1D*>(cpv._tfProperty->getTransferFunction());
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}
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if (cpv._afProperty.valid())
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{
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alphaFuncValue = cpv._afProperty->getValue();
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}
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if (_volumeTile->getLayer() && !masterLocator)
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{
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masterLocator = _volumeTile->getLayer()->getLocator();
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}
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osg::Matrix matrix;
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if (masterLocator)
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{
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matrix = masterLocator->getTransform();
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}
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osg::notify(osg::NOTICE)<<"Matrix = "<<matrix<<std::endl;
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osg::Texture::InternalFormatMode internalFormatMode = osg::Texture::USE_IMAGE_DATA_FORMAT;
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{
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osg::Texture::FilterMode minFilter = osg::Texture::LINEAR;
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osg::Texture::FilterMode magFilter = osg::Texture::LINEAR;
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osg::StateSet* stateset = _geode->getOrCreateStateSet();
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stateset->setMode(GL_ALPHA_TEST,osg::StateAttribute::ON);
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osg::Program* program = new osg::Program;
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stateset->setAttribute(program);
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// get shaders from source
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osg::Shader* vertexShader = osgDB::readShaderFile(osg::Shader::VERTEX, "shaders/volume.vert");
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if (vertexShader)
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{
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program->addShader(vertexShader);
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}
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else
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{
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#include "Shaders/volume_vert.cpp"
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program->addShader(new osg::Shader(osg::Shader::VERTEX, volume_vert));
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}
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{
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// set up the 3d texture itself,
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// note, well set the filtering up so that mip mapping is disabled,
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// gluBuild3DMipsmaps doesn't do a very good job of handled the
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// imbalanced dimensions of the 256x256x4 texture.
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osg::Texture3D* texture3D = new osg::Texture3D;
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texture3D->setResizeNonPowerOfTwoHint(false);
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texture3D->setFilter(osg::Texture3D::MIN_FILTER,minFilter);
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texture3D->setFilter(osg::Texture3D::MAG_FILTER, magFilter);
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texture3D->setWrap(osg::Texture3D::WRAP_R,osg::Texture3D::CLAMP_TO_EDGE);
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texture3D->setWrap(osg::Texture3D::WRAP_S,osg::Texture3D::CLAMP_TO_EDGE);
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texture3D->setWrap(osg::Texture3D::WRAP_T,osg::Texture3D::CLAMP_TO_EDGE);
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if (image_3d->getPixelFormat()==GL_ALPHA ||
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image_3d->getPixelFormat()==GL_LUMINANCE)
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{
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texture3D->setInternalFormatMode(osg::Texture3D::USE_USER_DEFINED_FORMAT);
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texture3D->setInternalFormat(GL_INTENSITY);
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}
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else
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{
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texture3D->setInternalFormatMode(internalFormatMode);
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}
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texture3D->setImage(image_3d);
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stateset->setTextureAttributeAndModes(0,texture3D,osg::StateAttribute::ON);
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osg::Uniform* baseTextureSampler = new osg::Uniform("baseTexture",0);
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stateset->addUniform(baseTextureSampler);
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}
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if (shadingModel==MaximumIntensityProjection)
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{
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if (tf)
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{
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osg::Texture1D* texture1D = new osg::Texture1D;
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texture1D->setImage(tf->getImage());
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stateset->setTextureAttributeAndModes(1,texture1D,osg::StateAttribute::ON);
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osg::Shader* fragmentShader = osgDB::readShaderFile(osg::Shader::FRAGMENT, "shaders/volume_tf_mip.frag");
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if (fragmentShader)
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{
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program->addShader(fragmentShader);
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}
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else
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{
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#include "Shaders/volume_tf_mip_frag.cpp"
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program->addShader(new osg::Shader(osg::Shader::FRAGMENT, volume_tf_mip_frag));
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}
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osg::Uniform* tfTextureSampler = new osg::Uniform("tfTexture",1);
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stateset->addUniform(tfTextureSampler);
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}
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else
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{
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osg::Shader* fragmentShader = osgDB::readShaderFile(osg::Shader::FRAGMENT, "shaders/volume_mip.frag");
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if (fragmentShader)
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{
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program->addShader(fragmentShader);
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}
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else
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{
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#include "Shaders/volume_mip_frag.cpp"
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program->addShader(new osg::Shader(osg::Shader::FRAGMENT, volume_mip_frag));
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}
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}
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}
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else if (shadingModel==Isosurface)
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{
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stateset->addUniform(cpv._isoProperty->getUniform());
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if (tf)
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{
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osg::Texture1D* texture1D = new osg::Texture1D;
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texture1D->setImage(tf->getImage());
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texture1D->setResizeNonPowerOfTwoHint(false);
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texture1D->setFilter(osg::Texture::MIN_FILTER, osg::Texture::LINEAR);
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texture1D->setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR);
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texture1D->setWrap(osg::Texture::WRAP_R,osg::Texture::CLAMP_TO_EDGE);
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stateset->setTextureAttributeAndModes(1,texture1D,osg::StateAttribute::ON);
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osg::Uniform* tfTextureSampler = new osg::Uniform("tfTexture",1);
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stateset->addUniform(tfTextureSampler);
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osg::Shader* fragmentShader = osgDB::readShaderFile(osg::Shader::FRAGMENT, "shaders/volume_tf_iso.frag");
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if (fragmentShader)
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{
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program->addShader(fragmentShader);
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}
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else
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{
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#include "Shaders/volume_tf_iso_frag.cpp"
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program->addShader(new osg::Shader(osg::Shader::FRAGMENT, volume_tf_iso_frag));
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}
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}
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else
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{
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osg::Shader* fragmentShader = osgDB::readShaderFile(osg::Shader::FRAGMENT, "shaders/volume_iso.frag");
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if (fragmentShader)
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{
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osg::notify(osg::NOTICE)<<"Shader found"<<std::endl;
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program->addShader(fragmentShader);
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}
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else
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{
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osg::notify(osg::NOTICE)<<"No Shader found"<<std::endl;
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#include "Shaders/volume_iso_frag.cpp"
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program->addShader(new osg::Shader(osg::Shader::FRAGMENT, volume_iso_frag));
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}
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}
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}
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else if (shadingModel==Light)
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{
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if (tf)
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{
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osg::Texture1D* texture1D = new osg::Texture1D;
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texture1D->setImage(tf->getImage());
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texture1D->setResizeNonPowerOfTwoHint(false);
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texture1D->setFilter(osg::Texture::MIN_FILTER, osg::Texture::LINEAR);
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texture1D->setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR);
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texture1D->setWrap(osg::Texture::WRAP_R,osg::Texture::CLAMP_TO_EDGE);
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stateset->setTextureAttributeAndModes(1,texture1D,osg::StateAttribute::ON);
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osg::Uniform* tfTextureSampler = new osg::Uniform("tfTexture",1);
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stateset->addUniform(tfTextureSampler);
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osg::Shader* fragmentShader = osgDB::readShaderFile(osg::Shader::FRAGMENT, "shaders/volume_lit_tf.frag");
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if (fragmentShader)
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{
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program->addShader(fragmentShader);
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}
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else
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{
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#include "Shaders/volume_lit_tf_frag.cpp"
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program->addShader(new osg::Shader(osg::Shader::FRAGMENT, volume_lit_tf_frag));
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}
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}
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else
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{
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osg::Shader* fragmentShader = osgDB::readShaderFile(osg::Shader::FRAGMENT, "shaders/volume_lit.frag");
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if (fragmentShader)
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{
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program->addShader(fragmentShader);
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}
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else
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{
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#include "Shaders/volume_lit_frag.cpp"
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program->addShader(new osg::Shader(osg::Shader::FRAGMENT, volume_lit_frag));
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}
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}
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}
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else
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{
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if (tf)
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{
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osg::notify(osg::NOTICE)<<"Setting up TF path"<<std::endl;
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osg::Texture1D* texture1D = new osg::Texture1D;
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texture1D->setImage(tf->getImage());
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texture1D->setResizeNonPowerOfTwoHint(false);
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texture1D->setFilter(osg::Texture::MIN_FILTER, osg::Texture::LINEAR);
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texture1D->setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR);
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texture1D->setWrap(osg::Texture::WRAP_R,osg::Texture::CLAMP_TO_EDGE);
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stateset->setTextureAttributeAndModes(1,texture1D,osg::StateAttribute::ON);
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osg::Uniform* tfTextureSampler = new osg::Uniform("tfTexture",1);
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stateset->addUniform(tfTextureSampler);
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osg::Shader* fragmentShader = osgDB::readShaderFile(osg::Shader::FRAGMENT, "shaders/volume_tf.frag");
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if (fragmentShader)
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{
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program->addShader(fragmentShader);
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}
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else
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{
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#include "Shaders/volume_tf_frag.cpp"
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program->addShader(new osg::Shader(osg::Shader::FRAGMENT, volume_tf_frag));
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}
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}
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else
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{
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osg::Shader* fragmentShader = osgDB::readShaderFile(osg::Shader::FRAGMENT, "shaders/volume.frag");
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if (fragmentShader)
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{
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program->addShader(fragmentShader);
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}
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else
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{
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#include "Shaders/volume_frag.cpp"
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program->addShader(new osg::Shader(osg::Shader::FRAGMENT, volume_frag));
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}
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}
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}
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if (cpv._sampleDensityProperty.valid())
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stateset->addUniform(cpv._sampleDensityProperty->getUniform());
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else
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stateset->addUniform(new osg::Uniform("SampleDensityValue",0.0005f));
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if (cpv._transparencyProperty.valid())
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stateset->addUniform(cpv._transparencyProperty->getUniform());
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else
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stateset->addUniform(new osg::Uniform("TransparencyValue",1.0f));
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if (cpv._afProperty.valid())
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stateset->addUniform(cpv._afProperty->getUniform());
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else
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stateset->addUniform(new osg::Uniform("AlphaFuncValue",alphaFuncValue));
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stateset->setMode(GL_CULL_FACE, osg::StateAttribute::ON);
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osg::TexGen* texgen = new osg::TexGen;
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texgen->setMode(osg::TexGen::OBJECT_LINEAR);
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texgen->setPlanesFromMatrix(osg::Matrix::inverse(matrix));
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stateset->setTextureAttributeAndModes(0, texgen, osg::StateAttribute::ON);
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}
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{
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osg::Geometry* geom = new osg::Geometry;
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osg::Vec3Array* coords = new osg::Vec3Array(8);
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(*coords)[0] = osg::Vec3d(0.0,0.0,0.0) * matrix;
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(*coords)[1] = osg::Vec3d(1.0,0.0,0.0) * matrix;
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(*coords)[2] = osg::Vec3d(1.0,1.0,0.0) * matrix;
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(*coords)[3] = osg::Vec3d(0.0,1.0,0.0) * matrix;
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(*coords)[4] = osg::Vec3d(0.0,0.0,1.0) * matrix;
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(*coords)[5] = osg::Vec3d(1.0,0.0,1.0) * matrix;
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(*coords)[6] = osg::Vec3d(1.0,1.0,1.0) * matrix;
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(*coords)[7] = osg::Vec3d(0.0,1.0,1.0) * matrix;
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geom->setVertexArray(coords);
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osg::Vec4Array* colours = new osg::Vec4Array(1);
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(*colours)[0].set(1.0f,1.0f,1.0,1.0f);
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geom->setColorArray(colours);
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geom->setColorBinding(osg::Geometry::BIND_OVERALL);
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osg::DrawElementsUShort* drawElements = new osg::DrawElementsUShort(GL_QUADS);
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// bottom
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drawElements->push_back(0);
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drawElements->push_back(1);
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drawElements->push_back(2);
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drawElements->push_back(3);
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// bottom
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drawElements->push_back(3);
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drawElements->push_back(2);
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drawElements->push_back(6);
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drawElements->push_back(7);
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// left
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drawElements->push_back(0);
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drawElements->push_back(3);
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drawElements->push_back(7);
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drawElements->push_back(4);
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// right
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drawElements->push_back(5);
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drawElements->push_back(6);
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drawElements->push_back(2);
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drawElements->push_back(1);
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// front
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drawElements->push_back(1);
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drawElements->push_back(0);
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drawElements->push_back(4);
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drawElements->push_back(5);
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// top
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drawElements->push_back(7);
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drawElements->push_back(6);
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drawElements->push_back(5);
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drawElements->push_back(4);
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geom->addPrimitiveSet(drawElements);
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_geode->addDrawable(geom);
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}
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}
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void RayTracedTechnique::update(osgUtil::UpdateVisitor* uv)
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{
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// osg::notify(osg::NOTICE)<<"RayTracedTechnique:update(osgUtil::UpdateVisitor* nv):"<<std::endl;
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}
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void RayTracedTechnique::cull(osgUtil::CullVisitor* cv)
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{
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//osg::notify(osg::NOTICE)<<"RayTracedTechnique::cull(osgUtil::CullVisitor* nv)"<<std::endl;
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if (_geode.valid())
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{
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_geode->accept(*cv);
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}
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}
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void RayTracedTechnique::cleanSceneGraph()
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{
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osg::notify(osg::NOTICE)<<"RayTracedTechnique::cleanSceneGraph()"<<std::endl;
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}
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void RayTracedTechnique::traverse(osg::NodeVisitor& nv)
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{
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// osg::notify(osg::NOTICE)<<"RayTracedTechnique::traverse(osg::NodeVisitor& nv)"<<std::endl;
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if (!_volumeTile) return;
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// if app traversal update the frame count.
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if (nv.getVisitorType()==osg::NodeVisitor::UPDATE_VISITOR)
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{
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if (_volumeTile->getDirty()) _volumeTile->init();
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osgUtil::UpdateVisitor* uv = dynamic_cast<osgUtil::UpdateVisitor*>(&nv);
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if (uv)
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{
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update(uv);
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return;
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}
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}
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else if (nv.getVisitorType()==osg::NodeVisitor::CULL_VISITOR)
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{
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osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(&nv);
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if (cv)
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{
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cull(cv);
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return;
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}
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}
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if (_volumeTile->getDirty())
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{
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osg::notify(osg::INFO)<<"******* Doing init ***********"<<std::endl;
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_volumeTile->init();
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}
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}
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