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Added initial shell of new osgtransferfunction example that will be t…

…ested bed for upcomming transfer function editing UI.
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1 parent 12a379d commit 57b98ff948bd1a34265811f73f2c39f99da47c87 Robert OSFIELD committed
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1 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)
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6 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)
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115 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();
+}

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