Hi, I would like to write the output/buffer of fragment shader to texture (RTT) as I wish (e.g. all red), however this result is depending of the model's shapes visible in the scene. How can I proceed with this correctly?
Follow below my minimal source code and the results. Thanks in advance! Expected: [Image: http://forum.openscenegraph.org/files/expected_964.jpg ] Current: [Image: http://forum.openscenegraph.org/files/current_875.jpg ] Code: #include <osg/TextureRectangle> #include <osg/Group> #include <osgDB/ReadFile> #include <osgViewer/Viewer> #include <osg/PolygonMode> #include <osg/Texture> #include <osg/Camera> #include <osgText/Text> static const char *mrtVertSource = { "#version 130\n" "out vec3 worldNormal;\n" "void main(void)\n" "{\n" " gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n" " worldNormal = normalize(gl_NormalMatrix * gl_Normal);\n" " gl_TexCoord[0] = gl_MultiTexCoord0;\n" "}\n"}; static const char *mrtFragSource = { "#version 130\n" "in vec3 worldNormal;\n" "void main(void)\n" "{\n" " gl_FragData[0] = vec4(worldNormal, 0.0);\n" "}\n"}; osg::Geode *createScreenQuad(float width, float height, float scale = 1.0f) { osg::Geometry *geom = osg::createTexturedQuadGeometry( osg::Vec3(), osg::Vec3(width, 0.0f, 0.0f), osg::Vec3(0.0f, height, 0.0f), 0.0f, 0.0f, width * scale, height * scale); osg::ref_ptr<osg::Geode> quad = new osg::Geode; quad->addDrawable(geom); int values = osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED; quad->getOrCreateStateSet()->setAttribute( new osg::PolygonMode(osg::PolygonMode::FRONT_AND_BACK, osg::PolygonMode::FILL), values); quad->getOrCreateStateSet()->setMode(GL_LIGHTING, values); return quad.release(); } osg::Camera *createRTTCamera(osg::Camera::BufferComponent buffer, osg::Texture *tex) { osg::ref_ptr<osg::Camera> camera = new osg::Camera; camera->setClearColor(osg::Vec4()); camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT); camera->setRenderOrder(osg::Camera::PRE_RENDER); camera->setViewport(0, 0, tex->getTextureWidth(), tex->getTextureHeight()); camera->attach(buffer, tex); return camera.release(); } osg::Camera *createHUDCamera(double left, double right, double bottom, double top) { osg::ref_ptr<osg::Camera> camera = new osg::Camera; camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF); camera->setClearMask(GL_DEPTH_BUFFER_BIT); camera->setRenderOrder(osg::Camera::POST_RENDER); camera->setAllowEventFocus(false); camera->setProjectionMatrix(osg::Matrix::ortho2D(left, right, bottom, top)); camera->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF); return camera.release(); } osg::TextureRectangle *createFloatTexture(uint w, uint h) { osg::ref_ptr<osg::TextureRectangle> tex2D = new osg::TextureRectangle; tex2D->setTextureSize(w, h); tex2D->setInternalFormat(GL_RGB32F_ARB); tex2D->setSourceFormat(GL_RGBA); tex2D->setSourceType(GL_FLOAT); tex2D->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::LINEAR); tex2D->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::LINEAR); return tex2D.release(); } int main(int argc, char **argv) { osg::ref_ptr<osg::Node> scene = osgDB::readNodeFile("/home/romulo/Tools/OpenSceneGraph-Data/cow.osg"); unsigned int w = 800, h = 800; osg::Texture *normalTex = createFloatTexture(w, h); osg::ref_ptr<osg::Camera> rttCamera = createRTTCamera(osg::Camera::COLOR_BUFFER0, normalTex); rttCamera->addChild(scene.get()); osg::ref_ptr<osg::Program> program = new osg::Program; program->addShader(new osg::Shader(osg::Shader::VERTEX, mrtVertSource)); program->addShader(new osg::Shader(osg::Shader::FRAGMENT, mrtFragSource)); rttCamera->getOrCreateStateSet()->setAttributeAndModes(program.get(), osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE); rttCamera->getOrCreateStateSet()->addUniform(new osg::Uniform("defaultTex", 0)); osg::ref_ptr<osg::Camera> hudCamera = createHUDCamera(0.0, 1.0, 0.0, 1.0); hudCamera->addChild(createScreenQuad(1.f, 1.0f, w)); hudCamera->getOrCreateStateSet()->setTextureAttributeAndModes(0, normalTex); osg::ref_ptr<osg::Group> root = new osg::Group; root->addChild(rttCamera.get()); root->addChild(hudCamera.get()); root->addChild(scene.get()); osgViewer::Viewer viewer; viewer.setUpViewInWindow(0, 0, w, h); viewer.setSceneData(root.get()); return viewer.run(); } Rômulo ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=74467#74467
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