Added initial shell of new osgtransferfunction example that will be tested bed for upcomming transfer function editing UI.

examples/CMakeLists.txt

@@ -119,6 +119,7 @@ IF(DYNAMIC_OPENSCENEGRAPH)
     ADD_SUBDIRECTORY(osgstereomatch)
     ADD_SUBDIRECTORY(osgterrain)
     ADD_SUBDIRECTORY(osgthreadedterrain)
+    ADD_SUBDIRECTORY(osgtransferfunction)
     ADD_SUBDIRECTORY(osgtext)
     ADD_SUBDIRECTORY(osgtext3D)
     ADD_SUBDIRECTORY(osgtexture1D)

examples/osgtransferfunction/CMakeLists.txt

@@ -0,0 +1,6 @@
+SET(TARGET_SRC osgtransferfunction.cpp )
+
+SET(TARGET_ADDED_LIBRARIES osgVolume osgManipulator)
+
+#### end var setup  ###
+SETUP_EXAMPLE(osgtransferfunction)

examples/osgtransferfunction/osgtransferfunction.cpp

@@ -0,0 +1,115 @@
+/* OpenSceneGraph example, osggeometry.
+*
+*  Permission is hereby granted, free of charge, to any person obtaining a copy
+*  of this software and associated documentation files (the "Software"), to deal
+*  in the Software without restriction, including without limitation the rights
+*  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+*  copies of the Software, and to permit persons to whom the Software is
+*  furnished to do so, subject to the following conditions:
+*
+*  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+*  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+*  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+*  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+*  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+*  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+*  THE SOFTWARE.
+*/
+
+#include <osg/Geode>
+#include <osg/Geometry>
+#include <osg/io_utils>
+
+#include <osgDB/ReadFile>
+#include <osgDB/WriteFile>
+#include <osgDB/FileUtils>
+
+#include <osgVolume/VolumeTile>
+
+#include <osgViewer/Viewer>
+
+
+
+osg::TransferFunction1D* readTransferFunctionFile(const std::string& filename, float colorScale=1.0f)
+{
+    std::string foundFile = osgDB::findDataFile(filename);
+    if (foundFile.empty())
+    {
+        std::cout<<"Error: could not find transfer function file : "<<filename<<std::endl;
+        return 0;
+    }
+
+    std::cout<<"Reading transfer function "<<filename<<std::endl;
+
+    osg::TransferFunction1D::ColorMap colorMap;
+    osgDB::ifstream fin(foundFile.c_str());
+    while(fin)
+    {
+        float value, red, green, blue, alpha;
+        fin >> value >> red >> green >> blue >> alpha;
+        if (fin)
+        {
+            std::cout<<"value = "<<value<<" ("<<red<<", "<<green<<", "<<blue<<", "<<alpha<<")"<<std::endl;
+            colorMap[value] = osg::Vec4(red*colorScale,green*colorScale,blue*colorScale,alpha*colorScale);
+        }
+    }
+
+    if (colorMap.empty())
+    {
+        std::cout<<"Error: No values read from transfer function file: "<<filename<<std::endl;
+        return 0;
+    }
+
+    osg::TransferFunction1D* tf = new osg::TransferFunction1D;
+    tf->assign(colorMap);
+
+    return tf;
+}
+
+
+int main(int argc, char ** argv)
+{
+    osg::ArgumentParser arguments(&argc, argv);
+
+    osgViewer::Viewer viewer(arguments);
+
+    osg::ref_ptr<osg::TransferFunction1D> tf;
+    std::string filename;
+    if (arguments.read("--tf",filename))
+    {
+        tf = readTransferFunctionFile(filename);
+    }
+
+    osg::ref_ptr<osgVolume::Layer> layer;
+
+    osg::ref_ptr<osg::Node> model = osgDB::readNodeFiles(arguments);
+
+    osgVolume::VolumeTile* volumeTile = dynamic_cast<osgVolume::VolumeTile*>(model.get());
+    if (!volumeTile)
+    {
+        OSG_NOTICE<<"Please specify volume dataset on command line."<<std::endl;
+        return 1;
+    }
+
+    layer = volumeTile->getLayer();
+
+    if (!layer)
+    {
+        OSG_NOTICE<<"No layer loaded."<<std::endl;
+        return 1;
+    }
+
+    osg::ref_ptr<osgVolume::ImageLayer> imageLayer = dynamic_cast<osgVolume::ImageLayer*>(layer.get());
+
+    osg::ref_ptr<osg::Image> image = imageLayer.valid() ? imageLayer->getImage() : 0;
+
+    if (!image)
+    {
+        OSG_NOTICE<<"No image found."<<std::endl;
+    }
+
+
+    viewer.setSceneData( model.get() );
+
+    return viewer.run();
+}