Han, Yes, you will need to use shaders. Attach your MRT (multiple-render-target) textures, like you are doing:
rtt->attach(osg::Camera::BufferComponent(osg::Camera::COLOR_BUFFER0), colorTex); rtt->attach(osg::Camera::BufferComponent(osg::Camera::COLOR_BUFFER1), normalTex); rtt->attach(osg::Camera::BufferComponent(osg::Camera::COLOR_BUFFER2), depthTex); Then in your fragment shader, make an output corresponding to each buffer attachment: in vec3 normal; in vec4 color; ... layout(location=0) out vec4 gcolor; layout(location=1) out vec4 gnormal; layout(location=2) out vec4 gdepth; ... gcolor = color; gnormal = vec4((normal+1.0)/2.0, 1.0); gdepth = vec4(gl_FragCoord.z, 1.0); Notice that you will need to normalize the "normal" value so it's between [0..1]. Hope this helps! Glenn Waldron / osgEarth On Mon, Nov 11, 2019 at 4:20 AM Han Hu <huhan8...@gmail.com> wrote: > Hi, > > I would like to do offscreen rendering of a mesh. > Currently, I have suceeded to do this for both the color (RGB) and depth > data using the built-in functions as below. > > > Code: > > > osg::ref_ptr<osg::Image> rttImage = new osg::Image; > osg::ref_ptr<osg::Image> depthImage = new osg::Image; > > camera->attach(osg::Camera::COLOR_BUFFER, rttImage.get()); > camera->attach(osg::Camera::DEPTH_BUFFER, depthImage.get()); > > rttImage->allocateImage(ATInfo.width, ATInfo.height, 1, GL_RGB, > GL_UNSIGNED_BYTE); > depthImage->allocateImage(ATInfo.width, ATInfo.height, 1, > GL_DEPTH_COMPONENT, GL_FLOAT); > > > > > But I also need to render the normal vectors to images too. I have googled > this topic using native opengl, it seems that I have to write shaders for > it. But my mesh are defined using the osgb plugin format, so I must > implement in the osg. > > I would like to know, is there an approach to do this in osg? Thanks! > > Thank you! > > Cheers, > Han > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=76892#76892 > > > > > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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