Hi I think its wrong matrix multiplication order: >> mvmatrix = _viewercam->getProjectionMatrix()*vmatrix*wmatrix; should be mvmatrix = wmatrix*vmatrix*_viewercam->getProjectionMatrix();
in osg to transform vertex you use v = v * m, in shaders it's opposite Cheers, Sergey. 12.08.2012, 12:59, "Felix Meißgeier" <[email protected]>: > Hey, > > I can't find a solution. Maybe it helps if I post some code I extracted from > my project. It demonstrates my camera- and shader-setup. In the case I only > pass prjection-matrix to vertex-shader and replace "testmatrix*gl_Vertex" > with "gl_ProjectionMatrix*testmatrix*gl_Vertex" everything works fine. But > when I try to pass the whole modelviewprojection matrix it failed and nothing > of the scene is rendered. > > Thanks for help! > > osg-code: > > Code: > > struct TestCallback : public osg::Uniform::Callback{ > TestCallback(osg::Camera* viewercam, osg::Camera* othercam) > :_viewercam(viewercam),_othercam(othercam){ > } > > virtual void operator () (osg::Uniform* uniform, osg::NodeVisitor* nv){ > osg::Matrixd vmatrix=_viewercam->getViewMatrix(); > //vmatrix=vmatrix.rotate(- M_PI / 2.0, 1, 0, 0); > osg::Matrixd wmatrix=osg::computeLocalToWorld(nv->getNodePath()); > osg::Matrixd mvmatrix = _viewercam->getProjectionMatrix()*vmatrix*wmatrix; > uniform->set(mvmatrix); > } > > osg::Camera* _viewercam; > osg::Camera* _othercam; > > }; > > class MovementPostDrawCallback : public osg::Camera::DrawCallback{ > public: > MovementPostDrawCallback(osg::PositionAttitudeTransform* patnode, double > velocity) > :_patnode(patnode),_velocity(velocity){ > _startpos=_patnode->getPosition(); > } > > virtual void operator()(osg::RenderInfo &renderinfo) const{ > osg::Vec3 crtpos=_patnode->getPosition(); > double > crttimestp=renderinfo.getState()->getFrameStamp()->getSimulationTime(); > double bankangle=0.7; > crtpos[0]=_startpos[0]+sin(crttimestp)*100.0*_velocity; > bankangle=-sin(crttimestp)/2; > _patnode->setPosition(crtpos); > _patnode->setAttitude(osg::Quat(0.0, osg::X_AXIS, bankangle, osg::Y_AXIS, > 0.0, osg::Z_AXIS)); > } > > osg::PositionAttitudeTransform* _patnode; > osg::Vec3 _startpos; > double _velocity; > }; > > bool loadShaderSrcFiles(std::string vssrcfile, osg::Shader* vs, std::string > fssrcfile, osg::Shader* fs){ > bool returnval=true; > if(!vs->loadShaderSourceFromFile(vssrcfile)){ > osg::notify(osg::WARN)<<"Error while loading vertexshader-sourcefile > ("<<vssrcfile<<")..."; > returnval=false; > } > if(!fs->loadShaderSourceFromFile(fssrcfile)) > osg::notify(osg::WARN)<<"Error while loading fragmentshader-sourcefile > ("<<fssrcfile<<")..."; > > return returnval; > } > > int _tmain(int argc, _TCHAR* argv[]) > { > osg::setNotifyLevel( osg::WARN ); > int width=800; > int height=600; > osg::Vec2 displayres(width,height); > > std::cout<<"setup scene...\n"; > //setup scene > SceneBuilder sbuilder; > osg::Node* root = sbuilder.buildSubgraph(); > std::cout<<"scene built...\n"; > > //setup texture > osg::ref_ptr<osg::Texture2D> texture = new osg::Texture2D(); > texture->setTextureSize(width,height); > texture->setInternalFormat(GL_RGBA); > texture->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::LINEAR); > texture->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::LINEAR); > > //rtt cam > osg::ref_ptr<osg::Camera> rttcam = new osg::Camera(); > rttcam->setViewport(0,0,width, height); > rttcam->setClearMask(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); > rttcam->setClearColor(osg::Vec4(105/255.0,125/255.0,202/255.0,1.0)); > rttcam->setRenderOrder(osg::Camera::PRE_RENDER,1); > rttcam->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT); > rttcam->setReferenceFrame(osg::Transform::RELATIVE_RF); > rttcam->setProjectionMatrix(osg::Matrixd::identity()); > rttcam->attach(osg::Camera::COLOR_BUFFER, texture.get()); > rttcam->addChild(root); > rttcam->setPostDrawCallback(new > MovementPostDrawCallback(sbuilder.getCessnaPAT(),0.8)); > rttcam->setName("RTTCam"); > std::cout<<"rttcam created...\n"; > > //setup postrender-geode > osg::ref_ptr<osg::Geometry> prquad = > osg::createTexturedQuadGeometry(osg::Vec3(),osg::Vec3(width,0.0,0.0),osg::Vec3(0.0,height,0.0)); > osg::ref_ptr<osg::Geode> prgeode = new osg::Geode(); > prgeode->addDrawable(prquad.get()); > prgeode->setName("PostRenderDisplayGeode"); > prquad->getOrCreateStateSet()->setTextureAttributeAndModes(0,texture.get(),osg::StateAttribute::ON); > prquad->setName("PostRenderDisplayQuad"); > > //visualisation > osg::ref_ptr<osg::Camera> scenecam = new osg::Camera(); > scenecam->setViewport(0,0,width, height); > scenecam->setClearMask(GL_DEPTH_BUFFER_BIT|GL_COLOR_BUFFER_BIT); > scenecam->setClearColor(osg::Vec4(1.0,1.0,1.0,1.0)); > scenecam->setRenderOrder(osg::Camera::NESTED_RENDER); > scenecam->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT); > scenecam->setReferenceFrame(osg::Camera::ABSOLUTE_RF); > scenecam->setProjectionMatrix(osg::Matrix::ortho2D(0,width,0,height)); > scenecam->addChild(prgeode.get()); > scenecam->setName("SceneCam"); > std::cout<<"scenecam created...\n"; > > osg::ref_ptr<osg::Group> rootgroup = new osg::Group(); > rootgroup->setName("RootGroup"); > rootgroup->addChild(rttcam.get()); > rootgroup->addChild(scenecam.get()); > osgViewer::Viewer viewer; > viewer.setUpViewInWindow(250,50,width,height); > viewer.setSceneData(rootgroup.get()); > > osg::ref_ptr<osg::Shader> testverts = new osg::Shader(osg::Shader::VERTEX); > osg::ref_ptr<osg::Shader> testfrags = new > osg::Shader(osg::Shader::FRAGMENT); > osg::ref_ptr<osg::Program> testprog = new osg::Program(); > loadShaderSrcFiles("vertexshader120.vert",testverts.get(),"fragmentshader120.frag",testfrags.get()); > testprog->addShader(testverts.get()); > testprog->addShader(testfrags.get()); > osg::ref_ptr<osg::Uniform> testmatrixuniform = new > osg::Uniform(osg::Uniform::FLOAT_MAT4,"testmatrix"); > root->getOrCreateStateSet()->addUniform(testmatrixuniform.get()); > testmatrixuniform->setUpdateCallback(new > TestCallback(viewer.getCamera(),rttcam.get())); > root->getOrCreateStateSet()->setAttributeAndModes(testprog.get(),osg::StateAttribute::ON); > > // add the state manipulator > viewer.addEventHandler(new osgViewer::StatsHandler); > > viewer.getCamera()->setName("ViewerCam"); > > return viewer.run(); > } > > vert-shader > > Code: > > #version 120 > > uniform mat4 testmatrix; > > void main(){ > gl_Position = testmatrix*gl_Vertex; > } > > frag-shader > > Code: > > #version 120 > > void main(){ > gl_FragColor= vec4(1.0,1.0,1.0,1.0); > } > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=49239#49239 > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
