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 Sent: Monday, January 11, 2010 10:31 PM To: OpenSceneGraph Users 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 <mourad.boufargu...@gmail.com> 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 <dominic.stal...@bluewin.ch> 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 osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -------------------------------------------------------------------------------- _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
_______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
