Thanks Wojciech, what I am after is , I implemented a shader for light lobes and I want to use shadow map technique to avoid lightening behind obstacles. I might have more questions. If you have some hints, then please drop them
Nick http://www.linkedin.com/in/tnick Sent from Ünalan, İstanbul, Turkey On Tue, Jan 12, 2010 at 12:35 AM, Wojciech Lewandowski < [email protected]> wrote: > Hi Nick, > > ShadowComparison = true > causes opengl to use result of TexFilter(depth_at_texel > > depth_map_coord_r) > > ShadowComparison = false > causes opengl to use TexFilter( depth_at_texel ) value. > > To display depth texture on some hud its neccessary to turn > ShadowComparison *off*. Its kinda tricky because it has to be also* on*for > use with shadow mapping. > I used to apply special callback that was used to change the mode to > draw shadow map on the screen. See osgShadow/DebugShadowMap.cpp > *DrawableDrawWithDepthShadowComparisonOffCallback* callback > > Wojtek > > *From:* Trajce Nikolov <[email protected]> > *Sent:* Monday, January 11, 2010 10:31 PM > *To:* OpenSceneGraph Users <[email protected]> > *Subject:* Re: [osg-users] Depth buffer for shadow mapping > > Hi, > > I am trying to do the same. I noticed two methods of Texture2D. > texShadowMap->setShadowComparison(true); > texShadowMap->setShadowTextureMode(Texture2D::LUMINANCE); > > what are these doing? Also, what is to be done to display the depth texture > on screen. > Thanks > Nick > > http://www.linkedin.com/in/tnick > Sent from Ünalan, İstanbul, Turkey > > On Mon, Jan 11, 2010 at 11:27 PM, Mourad Boufarguine < > [email protected]> wrote: > >> Hi Dominic, >> >> AFAIK, the png plugin does not support writing depth image. Try the tiff >> plugin in svn/trunk ; a recent submission made it write depth images, and it >> works for me. >> >> Mourad >> >> On Mon, Jan 11, 2010 at 4:17 PM, Dominic Stalder < >> [email protected]> wrote: >> >>> Hi there >>> >>> I have the following RTT method: >>> >>> ref_ptr<Image> image = new Image; >>> image->allocateImage(osgViewer->width(), osgViewer->height(), 1, >>> GL_RGBA, GL_UNSIGNED_BYTE); >>> >>> // resets the size of the texture >>> texture->setTextureSize(osgViewer->width(), osgViewer->height()); >>> >>> // sets the clear mask the depth buffer >>> camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); >>> >>> // sets the clear color to white >>> camera->setClearColor(Vec4(1.0, 1.0, 1.0, 1.0)); >>> >>> ...matrices and viewport... >>> >>> // sets the reference frame to an absolute coordinate frame >>> camera->setReferenceFrame(Camera::ABSOLUTE_RF_INHERIT_VIEWPOINT); >>> >>> // sets the texture camera to render before rendering to the screen >>> camera->setRenderOrder(Camera::PRE_RENDER); >>> >>> // sets the rendering target of the texture camera to the frame buffer >>> object (FBO) >>> camera->setRenderTargetImplementation(Camera::FRAME_BUFFER_OBJECT); >>> >>> // attaches the texture to the texture camera (important: samples >>> mustn't be greater than zero) >>> // buffer component, texture, level, face, mip map generation, >>> samples, color samples >>> camera->attach(Camera::COLOR_BUFFER, image.get(), 0, 0); >>> >>> // adds the node to the texture camera (this node will be rendered to >>> the texture) >>> camera->addChild(node); >>> >>> // adds the texture camera to the root node >>> root->addChild(camera); >>> >>> If I write this image to file, it works great, I have my "balance" in the >>> middle of the image --> see attachment color_buffer.png. Now I would like to >>> write the depth buffer to the image (just for debugging, afterward I write >>> it to the texture), so I change the following lines: >>> >>> image->allocateImage(osgViewer->width(), osgViewer->height(), 1, GL_RGBA, >>> GL_UNSIGNED_BYTE); --> image->allocateImage(osgViewer->width(), >>> osgViewer->height(), 1, GL_DEPTH_COMPONENT, GL_FLOAT); >>> >>> camera->attach(Camera::COLOR_BUFFER, image.get(), 0, 0); --> >>> camera->attach(Camera::DEPTH_BUFFER, image.get(), 0, 0); >>> >>> After that I get the image depth_buffer.png, but this isn't correct, is >>> it? >>> >>> The texture looks like this, is it correct? >>> >>> // creates the texture for the shadow map >>> texShadowMap = new Texture2D; >>> texShadowMap->setInternalFormat(GL_DEPTH_COMPONENT); >>> texShadowMap->setShadowComparison(true); >>> texShadowMap->setShadowTextureMode(Texture2D::LUMINANCE); >>> texShadowMap->setFilter(Texture2D::MIN_FILTER, Texture2D::LINEAR); >>> texShadowMap->setFilter(Texture2D::MAG_FILTER, Texture2D::LINEAR); >>> texShadowMap->setWrap(Texture2D::WRAP_S, Texture2D::CLAMP_TO_BORDER); >>> texShadowMap->setWrap(Texture2D::WRAP_T, Texture2D::CLAMP_TO_BORDER); >>> texShadowMap->setBorderColor(Vec4(1.0, 1.0, 1.0, 1.0)); >>> >>> What am I doing wrong in this function? >>> >>> Thanks a lot >>> Dominic >>> >>> _______________________________________________ >>> 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 >> >> > ------------------------------ > > _______________________________________________ > 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 > >
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