Added osgmultiplecameras example and support for pre/post multiplaction.

examples/osgmultiplecameras/GNUmakefile

@@ -0,0 +1,18 @@
+TOPDIR = ../..
+include $(TOPDIR)/Make/makedefs 
+
+CXXFILES =\
+	osgmultiplecameras.cpp\
+
+LIBS     += -losgProducer -lProducer -losgText -losgProducer -lProducer -losgGA -losgDB -losgUtil -losg $(GL_LIBS) $(X_LIBS) $(OTHER_LIBS) 
+
+INSTFILES = \
+	$(CXXFILES)\
+	GNUmakefile.inst=GNUmakefile
+
+EXEC = osgmultiplecameras
+
+INC +=  $(X_INC)
+
+include $(TOPDIR)/Make/makerules 
+

examples/osgmultiplecameras/GNUmakefile.inst

@@ -0,0 +1,14 @@
+TOPDIR = ../..
+include $(TOPDIR)/Make/makedefs
+
+CXXFILES =\
+	osgmultiplecameras.cpp\
+
+LIBS     += -losgProducer -lProducer -losgText -losgProducer -lProducer -losgDB -losgText -losgUtil -losg $(GL_LIBS) $(X_LIBS) $(OTHER_LIBS) 
+
+EXEC = osgmultiplecameras
+
+INC += $(PRODUCER_INCLUDE_DIR) $(X_INC)
+LDFLAGS  += $(PRODUCER_LIB_DIR)
+
+include $(TOPDIR)/Make/makerules

examples/osgmultiplecameras/osgmultiplecameras.cpp

@@ -0,0 +1,132 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 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 <osgUtil/Optimizer>
+#include <osgDB/ReadFile>
+#include <osgProducer/Viewer>
+
+#include <osg/Material>
+#include <osg/Geode>
+#include <osg/BlendFunc>
+#include <osg/Depth>
+#include <osg/Projection>
+#include <osg/PolygonOffset>
+#include <osg/MatrixTransform>
+#include <osg/CameraNode>
+
+#include <osgText/Text>
+
+
+osg::Node* createRearView(osg::Node* subgraph)
+{
+
+    osg::CameraNode* camera = new osg::CameraNode;
+
+    // set the projection matrix
+    camera->setProjectionMatrix(osg::Matrix::ortho2D(0,1280,0,1024));
+
+    camera->setViewport(420,800,400,200);
+    
+    camera->getOrCreateStateSet()->setAttribute(camera->getViewport());
+
+
+    // set the view matrix
+    camera->setCullingActive(false);    
+    camera->setReferenceFrame(osg::Transform::RELATIVE_RF);
+    camera->setTransformOrder(osg::CameraNode::POST_MULTIPLE);
+    camera->setProjectionMatrix(osg::Matrixd::identity());
+    camera->setViewMatrix(osg::Matrixd::rotate(osg::inDegrees(180.0f),0.0f,1.0f,0.0f));
+
+    // only clear the depth buffer
+    camera->setClearMask(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
+
+    // draw subgraph after main camera view.
+    camera->setRenderOrder(osg::CameraNode::POST_RENDER);
+
+    camera->addChild(subgraph);
+    
+    return camera;
+}
+
+int main( int argc, char **argv )
+{
+
+    // use an ArgumentParser object to manage the program arguments.
+    osg::ArgumentParser arguments(&argc,argv);
+    
+    // set up the usage document, in case we need to print out how to use this program.
+    arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the example which demonstrates how to do Head Up Displays.");
+    arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] [filename] ...");
+    arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
+    
+
+    // construct the viewer.
+    osgProducer::Viewer viewer(arguments);
+
+    // set up the value with sensible default event handlers.
+    viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
+
+    // get details on keyboard and mouse bindings used by the viewer.
+    viewer.getUsage(*arguments.getApplicationUsage());
+
+    // if user request help write it out to cout.
+    if (arguments.read("-h") || arguments.read("--help"))
+    {
+        arguments.getApplicationUsage()->write(std::cout);
+        return 1;
+    }
+
+    // any option left unread are converted into errors to write out later.
+    arguments.reportRemainingOptionsAsUnrecognized();
+
+    // report any errors if they have occured when parsing the program aguments.
+    if (arguments.errors())
+    {
+        arguments.writeErrorMessages(std::cout);
+        return 1;
+    }
+    
+    // read the scene from the list of file specified commandline args.
+    osg::ref_ptr<osg::Node> scene = osgDB::readNodeFiles(arguments);
+
+    osg::ref_ptr<osg::Group> group  = new osg::Group;
+    
+    // add the HUD subgraph.    
+    if (scene.valid()) group->addChild(scene.get());
+    group->addChild(createRearView(scene.get()));
+
+    // set the scene to render
+    viewer.setSceneData(group.get());
+
+    // create the windows and run the threads.
+    viewer.realize();
+
+    while( !viewer.done() )
+    {
+        // wait for all cull and draw threads to complete.
+        viewer.sync();
+
+        // update the scene by traversing it with the the update visitor which will
+        // call all node update callbacks and animations.
+        viewer.update();
+         
+        // fire off the cull and draw traversals of the scene.
+        viewer.frame();
+        
+    }
+    
+    // wait for all cull and draw threads to complete before exit.
+    viewer.sync();
+    
+    return 0;
+}