-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Poirier, Guillaume wrote: > I've seen a lot of posts lately regarding multi-pass shading. I think > the core osg should probably offer more high level capabilities wrt > shaders. I am attaching some code I've made that works for me to do > what I call "ModelEffects" (multi-pass shaders on models) and "PostEffects" > (multi-pass post-rendering on screen) that work with both Cg and glsl. I am > not > a good programmer but this might maybe help some people. I tried to include > some high-level functionality that I thought would be helpful, for example > render scene depth in a 32-bit float buffer or create "PostEffects" with > multiple > passes of different render target sizes, for example to perform reduction > on the GPU (obtain buffer min/max values in final 1x1 texture). > > The osgFX / osgNV was a good step in the direction of high-level shader > constructs > but it did not support glsl and unfortunately the project is on halt. > > It would also be interesting to see in the future how shaders could be > combined in a scene graph hierarchy. I've not worked with the nvidia scene > graph but I would be curious to see its multiple shader combination > capabilities. Perhaps this is something that we should investigate... > > I would also take a look at Sh that looks very good on the architecture > standpoint and high-level capabilities (http://libsh.org/). People might also want to take a look at what Ogre (http://www.ogre3d.org) has done with material definition scripts, compositor scripts, etc. (http://www.ogre3d.org/docs/manual/) and think about that with respect to OSG.
Tim > > > regards, > > > bill > > > -----Original Message----- > From: [EMAIL PROTECTED] on behalf of Swen Walkowski > Sent: Fri 10/12/2007 2:33 AM > To: [email protected] > Subject: Re: [osg-users] Multipassshading in OSG v1.2 > > Hello all, > > thanks for the answers! I have tried a look to the osgFX and to the > source code (thanks Christian). > > One question I have. See I that right that I can just use Multipass > sading at the time in OSG. I have to write my own solution like what > you have posted Christian, or do the inflexibility way? > I think about it, because I have to use it in my diploma thesis and at > the time we don't know in wisch way we have to use the shading. So > maybe it is good to do an onw solution. > > Christian, from your expiriance how long you meen it takes to get > thinks with an own solution running? > > Thanks a lot, > Swen > > On 10/11/07, Swen Walkowski <[EMAIL PROTECTED]> wrote: >> Hello all, >> >> i try to do Multipassshading in OSG v1.2. >> I have written my own shader class in the class I use the osg::shader >> for shading. At the time my shading code looks like that: >> Shader::Shader(void) { >> //creating program >> program = new osg::Program; >> >> //creating shader >> vertShader = new osg::Shader(osg::Shader::VERTEX); >> fragShader = new osg::Shader(osg::Shader::FRAGMENT); >> } >> >> Shader::~Shader(void) { >> } >> >> void Shader::apply(osg::StateSet& state) { >> state.setAttributeAndModes(program, osg::StateAttribute::ON); >> >> vertShader->loadShaderSourceFromFile("shaders/Fixed_Functionality.vert"); >> fragShader->loadShaderSourceFromFile("shaders/Fixed_Functionality.frag"); >> >> program->addShader(vertShader); >> program->addShader(fragShader); >> >> //parameterize the shader with video texture (0 by default) >> state.addUniform(new osg::Uniform("texture", 0)); >> >> posXUniform = new osg::Uniform("posX", (float)0.0); >> posYUniform = new osg::Uniform("posY", (float)0.0); >> intensityUniform = new osg::Uniform("intensity", (float)1.0); >> radiusUniform = new osg::Uniform("radius", (float)0.2); >> >> state.addUniform(posXUniform); >> state.addUniform(posYUniform); >> state.addUniform(intensityUniform); >> state.addUniform(radiusUniform) >> } >> >> That works well. >> >> Now i try to add an secend shading pass. I have read a lot over >> rendering to texture (RTT) in OSG in the mailinglist. So I tryed to >> find the examples or something in the OSG documentation.But without >> luke. >> >> Hope someone can tell me were I find the documentation for >> Multipassshading in OSG or an example or maybe how it works. >> >> Thangs, >> Swen >> > _______________________________________________ > 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 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFHD+nEeDhWHdXrDRURAoAgAJ97TIkbyYu+gUR2P29ERL6/mleCiwCglk7j 3vJqwHAhnQNFblwxeCISMHU= =82jk -----END PGP SIGNATURE----- _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
