682b867e4f
From Robert Osfield, made the background colour of the intersted camera a scaled down verson of the main background colour to make it more obvious.
141 lines
4.7 KiB
C++
141 lines
4.7 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#include <osgUtil/Optimizer>
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#include <osgDB/ReadFile>
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#include <osgProducer/Viewer>
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#include <osg/Material>
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#include <osg/Geode>
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#include <osg/BlendFunc>
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#include <osg/Depth>
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#include <osg/Projection>
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#include <osg/PolygonOffset>
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#include <osg/MatrixTransform>
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#include <osg/CameraNode>
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#include <osg/FrontFace>
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#include <osgText/Text>
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osg::Node* createRearView(osg::Node* subgraph, const osg::Vec4& clearColour)
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{
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osg::CameraNode* camera = new osg::CameraNode;
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// set the viewport
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camera->setViewport(10,10,400,200);
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// set the view matrix
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camera->setCullingActive(false);
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camera->setReferenceFrame(osg::Transform::RELATIVE_RF);
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camera->setTransformOrder(osg::CameraNode::POST_MULTIPLE);
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camera->setProjectionMatrix(osg::Matrixd::scale(-1.0f,1.0f,1.0f));
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camera->setViewMatrix(osg::Matrixd::rotate(osg::inDegrees(180.0f),0.0f,1.0f,0.0f));
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// set clear the color and depth buffer
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camera->setClearColor(clearColour);
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camera->setClearMask(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
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// draw subgraph after main camera view.
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camera->setRenderOrder(osg::CameraNode::POST_RENDER);
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// add the subgraph to draw.
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camera->addChild(subgraph);
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// switch of back face culling as we've swapped over the projection matrix making back faces become front faces.
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camera->getOrCreateStateSet()->setAttribute(new osg::FrontFace(osg::FrontFace::CLOCKWISE));
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return camera;
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}
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int main( int argc, char **argv )
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{
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// use an ArgumentParser object to manage the program arguments.
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osg::ArgumentParser arguments(&argc,argv);
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// set up the usage document, in case we need to print out how to use this program.
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arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the example which demonstrates how to do Head Up Displays.");
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arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] [filename] ...");
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arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
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// construct the viewer.
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osgProducer::Viewer viewer(arguments);
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// set up the value with sensible default event handlers.
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viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
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// get details on keyboard and mouse bindings used by the viewer.
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viewer.getUsage(*arguments.getApplicationUsage());
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// if user request help write it out to cout.
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if (arguments.read("-h") || arguments.read("--help"))
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{
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arguments.getApplicationUsage()->write(std::cout);
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return 1;
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}
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// any option left unread are converted into errors to write out later.
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arguments.reportRemainingOptionsAsUnrecognized();
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// report any errors if they have occured when parsing the program aguments.
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if (arguments.errors())
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{
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arguments.writeErrorMessages(std::cout);
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return 1;
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}
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// read the scene from the list of file specified commandline args.
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osg::ref_ptr<osg::Node> scene = osgDB::readNodeFiles(arguments);
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osg::ref_ptr<osg::Group> group = new osg::Group;
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// add the HUD subgraph.
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if (scene.valid()) group->addChild(scene.get());
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osg::Vec4 colour = viewer.getClearColor();
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colour.r() *= 0.5f;
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colour.g() *= 0.5f;
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colour.b() *= 0.5f;
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// note tone down the normal back ground colour to make it obvious that there is a seperate camera inserted.
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group->addChild(createRearView(scene.get(), colour));
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// set the scene to render
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viewer.setSceneData(group.get());
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// create the windows and run the threads.
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viewer.realize();
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while( !viewer.done() )
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{
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// wait for all cull and draw threads to complete.
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viewer.sync();
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// update the scene by traversing it with the the update visitor which will
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// call all node update callbacks and animations.
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viewer.update();
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// fire off the cull and draw traversals of the scene.
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viewer.frame();
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}
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// wait for all cull and draw threads to complete before exit.
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viewer.sync();
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return 0;
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}
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