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Added new osgVolume::VolumeScene and osgVolume::MultipassTechnique class shells that will be filled out to provide multi-pass volume rendering that handles mixing of

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3D meshes with volume rendering and segmentation of volumes via a user defined hull mesh.
This commit is contained in:
Robert Osfield
2013-11-21 18:17:44 +00:00
parent 1b269a7711
commit 5bea13c172
6 changed files with 330 additions and 3 deletions
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63
examples/osgvolume/osgvolume.cpp
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@@ -69,6 +69,8 @@
#include <osgVolume/VolumeTile>
#include <osgVolume/RayTracedTechnique>
#include <osgVolume/FixedFunctionTechnique>
#include <osgVolume/MultipassTechnique>
#include <osgVolume/VolumeScene>
enum ShadingModel
{
@@ -437,6 +439,9 @@ int main( int argc, char **argv )
arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
arguments.getApplicationUsage()->addCommandLineOption("--images [filenames]","Specify a stack of 2d images to build the 3d volume from.");
arguments.getApplicationUsage()->addCommandLineOption("--shader","Use OpenGL Shading Language. (default)");
arguments.getApplicationUsage()->addCommandLineOption("--multi-pass","Use MultipassTechnique to render volumes.");
arguments.getApplicationUsage()->addCommandLineOption("--model","load 3D model and insert into the scene along with the volume.");
arguments.getApplicationUsage()->addCommandLineOption("--hull","load 3D hull that defines the extents of the region to volume render.");
arguments.getApplicationUsage()->addCommandLineOption("--no-shader","Disable use of OpenGL Shading Language.");
arguments.getApplicationUsage()->addCommandLineOption("--gpu-tf","Aply the transfer function on the GPU. (default)");
arguments.getApplicationUsage()->addCommandLineOption("--cpu-tf","Apply the transfer function on the CPU.");
@@ -618,11 +623,36 @@ int main( int argc, char **argv )
bool useManipulator = false;
while(arguments.read("--manipulator") || arguments.read("-m")) { useManipulator = true; }
bool useShader = true;
while(arguments.read("--shader")) { useShader = true; }
while(arguments.read("--no-shader")) { useShader = false; }
bool useMultipass = false;
while(arguments.read("--multi-pass")) useMultipass = true;
std::string filename;
osg::ref_ptr<osg::Group> models;
while(arguments.read("--model",filename))
{
osg::ref_ptr<osg::Node> model = osgDB::readNodeFile(filename);
if (model.valid())
{
if (!models) models = new osg::Group;
models->addChild(model.get());
}
}
osg::ref_ptr<osg::Group> hulls;
while(arguments.read("--hull",filename))
{
osg::ref_ptr<osg::Node> hull = osgDB::readNodeFile(filename);
if (hull.valid())
{
if (!hulls) hulls = new osg::Group;
hulls->addChild(hull.get());
}
}
bool gpuTransferFunction = true;
while(arguments.read("--gpu-tf")) { gpuTransferFunction = true; }
while(arguments.read("--cpu-tf")) { gpuTransferFunction = false; }
@@ -1098,7 +1128,14 @@ int main( int argc, char **argv )
layer->addProperty(sp);
tile->setVolumeTechnique(new osgVolume::RayTracedTechnique);
if (useMultipass)
{
tile->setVolumeTechnique(new osgVolume::MultipassTechnique);
}
else
{
tile->setVolumeTechnique(new osgVolume::RayTracedTechnique);
}
}
else
{
@@ -1165,6 +1202,28 @@ int main( int argc, char **argv )
loadedModel = group;
}
if (hulls.get())
{
tile->addChild(hulls.get());
}
// add add models into the scene alongside the volume
if (models.get())
{
osg::ref_ptr<osg::Group> group = new osg::Group;
group->addChild(models.get());
group->addChild(loadedModel.get());
loadedModel = group.get();
}
// if we want to do multi-pass volume rendering we need decorate the whole scene with a VolumeScene node.
if (useMultipass)
{
osg::ref_ptr<osgVolume::VolumeScene> volumeScene = new osgVolume::VolumeScene;
volumeScene->addChild(loadedModel.get());
loadedModel = volumeScene.get();
}
// set the scene to render
viewer.setSceneData(loadedModel.get());