dfb21cb81a
osggeodemo
osggeometry
osghud
osgimpostor
osgkeyboard
osglauncher
osglight
osglightpoint
osglogicop
osglogo
osgmovie
osgmultiplecameras
osgmultitexture
osgoccluder
osgparametric
osgparticle
92 lines
2.9 KiB
C++
92 lines
2.9 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 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 <osgViewer/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/Camera>
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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::Camera* camera = new osg::Camera;
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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::Camera::POST_MULTIPLY);
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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::Camera::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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// construct the viewer.
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osgViewer::Viewer viewer;
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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.getCamera()->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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return viewer.run();
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}
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