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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2009 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#include <osgVolume/FixedFunctionTechnique>
#include <osgVolume/VolumeTile>
#include <osg/Billboard>
#include <osg/Texture3D>
#include <osg/Geometry>
#include <osg/ClipNode>
#include <osg/Material>
#include <osg/TexGenNode>
#include <osg/AlphaFunc>
#include <osg/BlendFunc>
#include <osg/BlendEquation>
#include <osg/TexEnv>
#include <osg/io_utils>
using namespace osgVolume;
FixedFunctionTechnique::FixedFunctionTechnique():
_numSlices(500)
{
}
FixedFunctionTechnique::FixedFunctionTechnique(const FixedFunctionTechnique& fft,const osg::CopyOp& copyop):
VolumeTechnique(fft,copyop),
_numSlices(fft._numSlices)
{
}
FixedFunctionTechnique::~FixedFunctionTechnique()
{
}
void FixedFunctionTechnique::setNumSlices(unsigned int numSlices)
{
if (_numSlices==numSlices) return;
_numSlices = numSlices;
if (_volumeTile) _volumeTile->setDirty(true);
}
osg::Node* createCube(const osg::Vec3& center, float size, unsigned int numSlices)
{
// set up the Geometry.
osg::Geometry* geom = new osg::Geometry;
float halfSize = size*0.5f;
float y = halfSize;
float dy =-size/(float)(numSlices-1);
//y = -halfSize;
//dy *= 0.5;
osg::Vec3Array* coords = new osg::Vec3Array(4*numSlices);
geom->setVertexArray(coords);
for(unsigned int i=0;i<numSlices;++i, y+=dy)
{
(*coords)[i*4+0].set(-halfSize,y,halfSize);
(*coords)[i*4+1].set(-halfSize,y,-halfSize);
(*coords)[i*4+2].set(halfSize,y,-halfSize);
(*coords)[i*4+3].set(halfSize,y,halfSize);
}
osg::Vec3Array* normals = new osg::Vec3Array(1);
(*normals)[0].set(0.0f,-1.0f,0.0f);
geom->setNormalArray(normals, osg::Array::BIND_OVERALL);
osg::Vec4Array* colors = new osg::Vec4Array(1);
(*colors)[0].set(1.0f,1.0f,1.0f,1.0);
geom->setColorArray(colors, osg::Array::BIND_OVERALL);
geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS,0,coords->size()));
osg::Billboard* billboard = new osg::Billboard;
billboard->setMode(osg::Billboard::POINT_ROT_WORLD);
billboard->addDrawable(geom);
billboard->setPosition(0,center);
return billboard;
}
void FixedFunctionTechnique::init()
{
OSG_INFO<<"FixedFunctionTechnique::init()"<<std::endl;
if (!_volumeTile)
{
OSG_NOTICE<<"FixedFunctionTechnique::init(), error no volume tile assigned."<<std::endl;
return;
}
if (_volumeTile->getLayer()==0)
{
OSG_NOTICE<<"FixedFunctionTechnique::init(), error no layer assigned to volume tile."<<std::endl;
return;
}
if (_volumeTile->getLayer()->getImage()==0)
{
OSG_NOTICE<<"FixedFunctionTechnique::init(), error no image assigned to layer."<<std::endl;
return;
}
float alphaFuncValue = 0.1;
osg::Image* image_3d = 0;
osgVolume::Locator* masterLocator = _volumeTile->getLocator();
osg::Texture::InternalFormatMode internalFormatMode = osg::Texture::USE_IMAGE_DATA_FORMAT;
image_3d = _volumeTile->getLayer()->getImage();
CollectPropertiesVisitor cpv;
if (_volumeTile->getLayer()->getProperty())
{
_volumeTile->getLayer()->getProperty()->accept(cpv);
}
if (cpv._isoProperty.valid())
{
alphaFuncValue = cpv._isoProperty->getValue();
}
if (cpv._afProperty.valid())
{
alphaFuncValue = cpv._afProperty->getValue();
}
if (_volumeTile->getLayer() && !masterLocator)
{
masterLocator = _volumeTile->getLayer()->getLocator();
OSG_NOTICE<<"assigning locator = "<<masterLocator<<std::endl;
}
osg::Matrix matrix;
if (masterLocator)
{
matrix = masterLocator->getTransform();
}
OSG_NOTICE<<"Matrix = "<<matrix<<std::endl;
osg::Texture::FilterMode minFilter = osg::Texture::NEAREST;
osg::Texture::FilterMode magFilter = osg::Texture::NEAREST;
osg::Vec3d v000 = osg::Vec3d(0.0,0.0,0.0) * matrix;
osg::Vec3d v100 = osg::Vec3d(1.0,0.0,0.0) * matrix;
osg::Vec3d v010 = osg::Vec3d(0.0,1.0,0.0) * matrix;
osg::Vec3d v110 = osg::Vec3d(1.0,1.0,0.0) * matrix;
osg::Vec3d v001 = osg::Vec3d(0.0,0.0,1.0) * matrix;
osg::Vec3d v101 = osg::Vec3d(1.0,0.0,1.0) * matrix;
osg::Vec3d v011 = osg::Vec3d(0.0,1.0,1.0) * matrix;
osg::Vec3d v111 = osg::Vec3d(1.0,1.0,1.0) * matrix;
double cubeSize = (v111-v000).length();
osg::Vec3d center = (v000+v111)*0.5;
osg::ClipNode* clipnode = new osg::ClipNode;
clipnode->addChild(createCube(center, cubeSize, _numSlices));
clipnode->addClipPlane(new osg::ClipPlane(0, osg::Plane(v000, v011, v001)));
clipnode->addClipPlane(new osg::ClipPlane(1, osg::Plane(v100, v111, v110)));
clipnode->addClipPlane(new osg::ClipPlane(2, osg::Plane(v000, v101, v100)));
clipnode->addClipPlane(new osg::ClipPlane(3, osg::Plane(v110, v011, v010)));
clipnode->addClipPlane(new osg::ClipPlane(4, osg::Plane(v000, v110, v010)));
clipnode->addClipPlane(new osg::ClipPlane(5, osg::Plane(v001, v111, v101)));
osg::TexGenNode* texgenNode_0 = new osg::TexGenNode;
texgenNode_0->addChild(clipnode);
texgenNode_0->setTextureUnit(0);
texgenNode_0->getTexGen()->setMode(osg::TexGen::EYE_LINEAR);
texgenNode_0->getTexGen()->setPlanesFromMatrix(osg::Matrix::inverse(matrix));
osg::StateSet* stateset = texgenNode_0->getOrCreateStateSet();
stateset->setMode(GL_LIGHTING,osg::StateAttribute::ON);
stateset->setMode(GL_BLEND,osg::StateAttribute::ON);
if (cpv._afProperty.valid())
{
stateset->setAttributeAndModes(cpv._afProperty->getAlphaFunc(), osg::StateAttribute::ON);
}
else
{
stateset->setAttributeAndModes(new osg::AlphaFunc(osg::AlphaFunc::GREATER,alphaFuncValue), osg::StateAttribute::ON);
}
osg::Material* material = new osg::Material;
material->setDiffuse(osg::Material::FRONT_AND_BACK,osg::Vec4(1.0f,1.0f,1.0f,1.0f));
stateset->setAttributeAndModes(material);
if (cpv._mipProperty.valid())
{
stateset->setAttribute(new osg::BlendFunc(osg::BlendFunc::ONE, osg::BlendFunc::ONE));
stateset->setAttribute(new osg::BlendEquation(osg::BlendEquation::RGBA_MAX));
}
// set up the 3d texture itself,
// note, well set the filtering up so that mip mapping is disabled,
// gluBuild3DMipsmaps doesn't do a very good job of handled the
// imbalanced dimensions of the 256x256x4 texture.
osg::Texture3D* texture3D = new osg::Texture3D;
texture3D->setResizeNonPowerOfTwoHint(false);
texture3D->setFilter(osg::Texture3D::MIN_FILTER,minFilter);
texture3D->setFilter(osg::Texture3D::MAG_FILTER, magFilter);
texture3D->setWrap(osg::Texture3D::WRAP_R,osg::Texture3D::CLAMP_TO_EDGE);
texture3D->setWrap(osg::Texture3D::WRAP_S,osg::Texture3D::CLAMP_TO_EDGE);
texture3D->setWrap(osg::Texture3D::WRAP_T,osg::Texture3D::CLAMP_TO_EDGE);
if (image_3d->getPixelFormat()==GL_ALPHA ||
image_3d->getPixelFormat()==GL_LUMINANCE)
{
texture3D->setInternalFormatMode(osg::Texture3D::USE_USER_DEFINED_FORMAT);
texture3D->setInternalFormat(GL_INTENSITY);
}
else
{
texture3D->setInternalFormatMode(internalFormatMode);
}
texture3D->setImage(image_3d);
stateset->setTextureAttributeAndModes(0,texture3D,osg::StateAttribute::ON);
stateset->setTextureMode(0,GL_TEXTURE_GEN_S,osg::StateAttribute::ON);
stateset->setTextureMode(0,GL_TEXTURE_GEN_T,osg::StateAttribute::ON);
stateset->setTextureMode(0,GL_TEXTURE_GEN_R,osg::StateAttribute::ON);
stateset->setTextureAttributeAndModes(0,new osg::TexEnv(),osg::StateAttribute::ON);
_node = texgenNode_0;
}
void FixedFunctionTechnique::update(osgUtil::UpdateVisitor* /*uv*/)
{
// OSG_NOTICE<<"FixedFunctionTechnique:update(osgUtil::UpdateVisitor* nv):"<<std::endl;
}
void FixedFunctionTechnique::cull(osgUtil::CullVisitor* cv)
{
//OSG_NOTICE<<"FixedFunctionTechnique::cull(osgUtil::CullVisitor* nv)"<<std::endl;
if (_node.valid())
{
_node->accept(*cv);
}
}
void FixedFunctionTechnique::cleanSceneGraph()
{
OSG_NOTICE<<"FixedFunctionTechnique::cleanSceneGraph()"<<std::endl;
}
void FixedFunctionTechnique::traverse(osg::NodeVisitor& nv)
{
// OSG_NOTICE<<"FixedFunctionTechnique::traverse(osg::NodeVisitor& nv)"<<std::endl;
if (!_volumeTile) return;
// if app traversal update the frame count.
if (nv.getVisitorType()==osg::NodeVisitor::UPDATE_VISITOR)
{
if (_volumeTile->getDirty()) _volumeTile->init();
osgUtil::UpdateVisitor* uv = nv.asUpdateVisitor();
if (uv)
{
update(uv);
return;
}
}
else if (nv.getVisitorType()==osg::NodeVisitor::CULL_VISITOR)
{
osgUtil::CullVisitor* cv = nv.asCullVisitor();
if (cv)
{
cull(cv);
return;
}
}
if (_volumeTile->getDirty())
{
OSG_INFO<<"******* Doing init ***********"<<std::endl;
_volumeTile->init();
}
}
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