[osg-users] Osg and threads
Hi all, Currently working on a way to manage the memory efficiently, I would like to know what are the osg threads running ? I mean there are some threads in the databasePager, depending on the rendering threading mode there are threads for the render, the cull, or whatever... Did I miss something important ? What are the osg threads ? I would like to be able to make some king of pause on all treads to be able to allocate the whole available memory for the process without having some crash because a thread would be working (and so allocating memory) during this operation. Thanks for your help. Regards, Vincent. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Improper rotation
Hi Tom, thanks a lot for your answer! Tom Pearce wrote: In the step where you're calculating m, it looks like you're applying the rotation to the original matrix, which includes a translation already. Yes, this is (perhap) what i want. I try to be less ambiguous: my scene is a small room with a table at the center. The table, how you can see in pics has 8 rods, The table is translated by (0, 0, -309) to be placed on the floor My goal is to rotate a rdd using the mouse wheel: when i pick scroll up on a rod it should rotate the related rod by +angle (the variable rotation in code) on Y axis (-rotation if i scroll down). This is why (in my reasoning) i use the original matrix for rotate: i should not know how much rotated is the rod. The rod only need to be rotated on its Y axis, it should not be translated Tom Pearce wrote: I'm not sure why you say that the rotation and translation is formally right - the final translation should be equal to the original translation if you're rotating about a local axis, but it isn't. I said formally right because reading the output it seems that the rod is positioned right, but i'm not sure of this, since visually the rod is bad positioned after the rotation. Sincerely, more time I spend on this issue, more I feel confused :-)) However, to understand better how rods have to work (for rotating) , look some seconds of the following video: http://www.youtube.com/watch?v=p06NT8M5cKU PS: excuse my archaic English! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=35602#35602 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Incomplete TIFF plugin (tiled images)
Hi all, Thanks to the TIFF error ouput (See corresponding submission, a few minutes ago), I found that current TIFF plugin does not read tiled images properly. Has anyone worked on this? I found several functions like TIFFIsTiled(), TIFFReadTile()/TIFFReadRGBATile(), and tileContigRoutine/tileSeparateRoutine typedefs. However, I lack information about tiling to modify the plugin accordingly. Can anyone tell me anything interesting about it? Thanks. Sukender PVLE - Lightweight cross-platform game engine - http://pvle.sourceforge.net/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] libtiff update
Hi all, I tried to update libtiff to 4.0.0beta6 (I thought my tiled images issue it was a matter of version - See corresponding post), but unfortunately the libtiff strangely fails to make a==a be true at some point (SeekOK) on Win32 MSVC9 (test uses a 64 bit integer comparison inside a macro - works well only if you truncate to an int). Did anyone try to update the libtiff for osgPlugin TIFF? Thank you. Sukender PVLE - Lightweight cross-platform game engine - http://pvle.sourceforge.net/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] libtiff update
Hi Sukender I haven't tried it, but if a new libtiff version is available, I'll update the MSVC9 3rdparty package. Cheers, Torben -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=35606#35606 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Display a triad in a viewport corner
I need to clean things here and there but when it is all finished this would be a pleasure. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=35608#35608 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Need Help ! How to get Camera Position inside shaders
Hi Lait, If you want the camera position in world coordinate, you have to pass it yourself. OSG, like OpenGL only work in Eye Coordinate inside the shader. HTH David Callu 2011/1/13 Laith Dhawahir laithbasildot...@gmail.com Heey Guys, I hope you will fine, anyway, i have question about how i can get the camera position inside shader from open scene graph do i must pass it, or open scene graph already do that. Thank you! Cheers, Laith -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=35600#35600 ___ 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
Re: [osg-users] multiple tex gen modes in a single scene
Hi Paul, Eye linear glTexGen is positional state, i.e. it's value depends on the current modelview matrix, so has to be treated by the OSG like other positional state like glLight and glClipPlane. All positional state has to be positioned by a positional state node, and for glTexGen this is TexGenNode. During the cull traversal the OSG collects the positional state and binds the TexGen/Light/ClipPlane to modelview matrix at that point in traversal, this binding is done via the PositionalStateContainer, and there is one of these per RenderStage. During the draw traversal the positional state is then applied prior to the traversal of the RenderStage, and fixes each positional state in the appropriate place. While this technique doesn't properly fix the state as required, it does limit you to one position, per stage, you can't have two eye line tex gens/lights/clip planes applied on two separate subgraphs. Object linear TexGen isn't positional state so can be applied in the normal way and you have multiple of these per stage without problem. To have multiple Eye linear TexGen/TexGenNode's you'll need to break the scene up into multiple RenderStage and use the clear mask set to 0 on the subsequent stages so that each stage overlays correctly on the previous one. Other approaches are to write a custom TexGen that you push/pop a custom modelview matrix. I'm afraid both approaches are rather hacky. Robert. On Thu, Jan 13, 2011 at 2:28 AM, Paul Martz pma...@skew-matrix.com wrote: Hi all -- Has anyone ever successfully used multiple TexGen modes (say, EYE_LINEAR and OBJECT_LINEAR) on different objects in the same scene? What is the recommended way to do this in OSG? The TexGenNode has a pointer to a TexGen, and the TexGen has the mode. I assume I should create two TexGens, one OBJECT_LINEAR and one EYE_LINEAR, and two TexGenNodes to reference them, and add the two TexGenNodes to the scene graph. Then, I assume I should attach the same two TexGens as StateAttributes to different Node's StateSets as needed. I am running into some issues with this. If it sounds like I'm doing everything right, I'll post a small example that fails, or dig into the OSG code. More than likely, I'm doing something wrong here, so I just wanted to ask what the intended usage is. Thanks, -- -Paul Martz Skew Matrix Software http://www.skew-matrix.com/ ___ 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
Re: [osg-users] Need Help ! How to get Camera Position inside shaders
Hi Laith, In OpenGL the camera position is always at 0,0,0, and the scene is transformed into cameras coordinates by the modelview matrix. So... one has to ask are you wanting to do calculations in the eye/camera coordinates, world coordinates or local object coordinates? You can transform the camera position into world or local object coordinates by multipling by the inverse of the view or modelview matrices respectively. Robert. On Thu, Jan 13, 2011 at 6:34 AM, Laith Dhawahir laithbasildot...@gmail.com wrote: Heey Guys, I hope you will fine, anyway, i have question about how i can get the camera position inside shader from open scene graph do i must pass it, or open scene graph already do that. Thank you! Cheers, Laith -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=35600#35600 ___ 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
Re: [osg-users] Osg and threads
Hi Robert, First of all thanks for your answer, I didn't know about the Viewer::startThreading/stopThreading() and this sounds interesting I know that my request seems to be a very strange way to manage memory by pausing threads ... But I am not (completely) crazy. The datas amount I have to manage is the reason why I need to be sure, before loading a file, that I have enought memory including a fixed amount that I reserve for the rest of the code... so I need to saturate memory for a little while to be sure of the amount I can use, and for that I need to stop other threads to be sure they won't crash because of bad_alloc errors that are not managed. Thanks, I'll have a look at the things you gave to me. Regards, Vincent. Le 13/01/2011 11:32, Robert Osfield a écrit : Hi Vincent, The OSG threads that will run automatically are the DatabasePager when you have paged databases and any viewer threads. There is a viewer method for getting the threads. However, the threads are designed to be arbitrarily paused, you can start and stop the viewer threads via Viewer::startThreading/stopThreading() but this creates and destroys threads so not quite what you are after. However, I'm kinda perplexed how you think you might be managing memory more efficiently by pausing threads and doing stuff and then un pausing. I can't help but feel that you need to take a step back and work out what you mean by managing memory efficiently, there are lots of different ways of doing this, but given no information about what you mean and you actual motivation for this others like myself can't really point you in the right direction, the best I can say is from the sound of it you are currently looking in the wrong place. Robert. On Thu, Jan 13, 2011 at 8:14 AM, Vincent Bourdier vincent.bourd...@gmail.com wrote: Hi all, Currently working on a way to manage the memory efficiently, I would like to know what are the osg threads running ? I mean there are some threads in the databasePager, depending on the rendering threading mode there are threads for the render, the cull, or whatever... Did I miss something important ? What are the osg threads ? I would like to be able to make some king of pause on all treads to be able to allocate the whole available memory for the process without having some crash because a thread would be working (and so allocating memory) during this operation. Thanks for your help. Regards, Vincent. ___ 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] Another texty disappearing...
Hi all, I displayed a triad in a scene at the tip of which vectors I binded the axes names as text x, y and z. The text displays all good when I rotate the triad so long as the text is in front of the triad's origin. When the axes labels go behind the origin, the text suddenly disappears. Any idea what could cause this problem? Thanks, Antoine. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=35615#35615 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Need Help ! How to get Camera Position inside shaders
Hi Laith, OSG defines the osg_ViewMatrixInverse uniform. You have to add uniform mat4 osg_ViewMatrixInverse; in your shader to use it and find the camera location in world coordinates. Otherwise, there is the gl_ModelViewMatrixInverse uniform if you want to transform the camera position from eye coordinates (0,0,0) into local object coordinates. Regards, -Fred - Robert Osfield robert.osfi...@gmail.com a écrit : Hi Laith, In OpenGL the camera position is always at 0,0,0, and the scene is transformed into cameras coordinates by the modelview matrix. So... one has to ask are you wanting to do calculations in the eye/camera coordinates, world coordinates or local object coordinates? You can transform the camera position into world or local object coordinates by multipling by the inverse of the view or modelview matrices respectively. Robert. On Thu, Jan 13, 2011 at 6:34 AM, Laith Dhawahir laithbasildot...@gmail.com wrote: Heey Guys, I hope you will fine, anyway, i have question about how i can get the camera position inside shader from open scene graph do i must pass it, or open scene graph already do that. Thank you! Cheers, Laith -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=35600#35600 ___ 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
Re: [osg-users] gelGlShaderInfoLog returning false
Hi, osg by default initialize most of opengl related objects just before actual use, so before first frame your shaders likely to be not compiled\linked yet. afaik you can use osgUtil::GLObjectsVisitor with appropriate options on your scene to prepare all gl stuff before first frame, but be sure to call viewer.realize() first to initialize gl context. Cheers, Sergey -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=35617#35617 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Improper rotation
Hi, Basically what you need to do is translate rod to (0,0,0), apply rotation that u need, and translate back to original position. If your math is right and you still haven't expected results i'd say that your model has static transforms removed and translated to vertices coords, so center of your rod in local coords is not gonna be (0,0,0), and hence you will get wrong results with rotations, since your math assume that center of your rod in local coords is (0,0,0) to do proper rotation. You can try use like model bbox or bounding sphere center in local model coords and transform model to that coords instead of (0,0,0) before rotation or re-export your model without flatten static transforms optimization. Cheers, Sergey -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=35618#35618 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] PERSPECTIVE --FIELD OF VIEW
Hi, aspect is fovx/fovy, so you setup fovy as u need, and aspect as fovx / fovy. Cheers, Sergey -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=35619#35619 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] [build] PR0020 Eerror During Compilation
Hi, During the first Build solution procedure of OpenSceneGraph-2.9.10, using MSVS2008, there is this same error for two plugins: Code: 39Plugins osg serializer osgmanipulator : error PRJ0020 : Tool 'Linker', Property 'Manifest File' contains invalid file name 'osgdb_serializers_osgmanipulator.dir\Debug\osgdb_serializers_osgmanipulatord.dll.intermediate.manifest'. 81Plugins osg deprecated osganimation : error PRJ0020 : Tool 'Linker', Property 'Manifest File' contains invalid file name 'osgdb_deprecated_osganimation.dir\Debug\osgdb_deprecated_osganimationd.dll.intermediate.manifest'. I am guessing the reason might be the long path. But if it was, it should have been a problem for more people!! However, as a result, the dll.intermediate.manifest files are not generated, and hence the dll's themselves; and this naturally causes another error during the build of the INSTALL project, since it can't find the dll's. Any suggested workarounds for this issue are quite appreciated. I am thinking of disabling the manifest generation to be able to create the dlls, osgdb_serializers_osgmanipulatord.dll and osgdb_deprecated_osganimationd.dll, but I don't know if it will be a compromise for the integrity of the library or a potential cause for errors may be when I have to use these plugins.. Thank you! Cheers, Can[/code] -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=35607#35607 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] multiple tex gen modes in a single scene
On 1/13/2011 3:27 AM, Robert Osfield wrote: Object linear TexGen isn't positional state so can be applied in the normal way and you have multiple of these per stage without problem. Ah! Thanks, this was my problem. I mistakenly thought OpenGL transformed the object planes by the modelview matrix, and I was trying to set up an OSG scene graph to do that. My mistake. So I use TexGenNode to transform the eye planes, and for OBJECT_LINEAR I just attach the TexGen to a StateSet like any other StateAttribute. This works great! (Sheesh, I go off an code in shaders for a couple years, and I forget everything I ever knew about the FFP...) Thanks Robert! -Paul ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Question about camera autoComputeHomePosition
Do you know how to set a projection referential camera? off-axis camera? Thank you! Cheers, Dromouse -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=35622#35622 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] [QUESTION]How Projection Referential Cameras Work in OSG?
Hi, everyone: I am trying to setup a VR system using OSG. Current, I want to learn how projection referential cameras work in OSG. One of the key features of the visualization component is the ability to use off-axis cameras (a.k.a Asymmetric frustum) The main idea of the projection referential cameras is to easily represent the displays of the VR installation inside the composition. As we know that the usual camera's viewing frustum is defined by: it position, orientation, field of view, aspect ratio and N/F clip plane... Projection Referential Cameras sets of a 3D plane in the composition as the projection referential of the camera. This 3D Plane is symbolized according to the actual dimensions and positions of a real screen. The viewing frustum of a projection referential camera is defined by: it position, it clipping plane(n/f) and 3D plane projection referential. [Image: http://i53.tinypic.com/33v29ab.jpg ] 3D sprite can be considered as projection ref~ Now the frustum can be asymmetric, as opposed to the usual cameras frustums. Anybody knows how to setup this kind of projection referential camera using python or OpenGL in OSG? ... Thank you! Cheers, Dromouse[/img] -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=35623#35623 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] different rendering states for different passes?
Hello all, I have a bit of a knotty problem and was hoping for some advice. I am using OSG 2.8.3. I am using osgShadow::LightSpacePerspectiveShadowMapVB, which renders the scene in two passes; the prerender stage renders the shadow map, the main state renders the scene. My understanding is that the behavior of the two passes is controlled by setting different shader programs at the scene root, which sets the default shader program for the whole scene. However, I am also using shader programs at some of my leaf nodes. I would like it to accept shadows, so it needs to read the shadowTexture uniform. However, this uniform is only available on the main drawing pass, not the prerender pass (since the purpose of the prerender pass is to generate the shadow texture). The problem I am encountering is the fact that my shader program does not have a way to distinguish between executing the prerender pass and the main pass, and attempts to read the (non-existent) shadowTexture uniform in the prerender pass, which causes a GL error and results in the node not showing up at all. I know the solution is to use different shaders for different passes, but I haven't figured out the right way to set up OSG to do this at the leaf. Can anyone point me in the right direction? -- Peter Amstutz Senior Software Engineer Technology Solutions Experts Natick, MA 02131 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Osg and threads
Hi, I'm still having issues with that... I use a composite viewer with only one view. I tried to call startThreading/stopThreading() but it does nothing... I also tried getAllThreads(...) to get for each thread its thread ID, and it returns me only one thread with ID to 0... even if I know that there is 2 threads running for the rendering... I know I'm not supposed to disturb the rendering threads, but if I cannot get them there is no risk at all... Did I miss something ? Thanks. Regards, Vincent. Le 13/01/2011 11:49, Vincent Bourdier a écrit : Hi Robert, First of all thanks for your answer, I didn't know about the Viewer::startThreading/stopThreading() and this sounds interesting I know that my request seems to be a very strange way to manage memory by pausing threads ... But I am not (completely) crazy. The datas amount I have to manage is the reason why I need to be sure, before loading a file, that I have enought memory including a fixed amount that I reserve for the rest of the code... so I need to saturate memory for a little while to be sure of the amount I can use, and for that I need to stop other threads to be sure they won't crash because of bad_alloc errors that are not managed. Thanks, I'll have a look at the things you gave to me. Regards, Vincent. Le 13/01/2011 11:32, Robert Osfield a écrit : Hi Vincent, The OSG threads that will run automatically are the DatabasePager when you have paged databases and any viewer threads. There is a viewer method for getting the threads. However, the threads are designed to be arbitrarily paused, you can start and stop the viewer threads via Viewer::startThreading/stopThreading() but this creates and destroys threads so not quite what you are after. However, I'm kinda perplexed how you think you might be managing memory more efficiently by pausing threads and doing stuff and then un pausing. I can't help but feel that you need to take a step back and work out what you mean by managing memory efficiently, there are lots of different ways of doing this, but given no information about what you mean and you actual motivation for this others like myself can't really point you in the right direction, the best I can say is from the sound of it you are currently looking in the wrong place. Robert. On Thu, Jan 13, 2011 at 8:14 AM, Vincent Bourdier vincent.bourd...@gmail.com wrote: Hi all, Currently working on a way to manage the memory efficiently, I would like to know what are the osg threads running ? I mean there are some threads in the databasePager, depending on the rendering threading mode there are threads for the render, the cull, or whatever... Did I miss something important ? What are the osg threads ? I would like to be able to make some king of pause on all treads to be able to allocate the whole available memory for the process without having some crash because a thread would be working (and so allocating memory) during this operation. Thanks for your help. Regards, Vincent. ___ 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
Re: [osg-users] PERSPECTIVE --FIELD OF VIEW
I'll clarify this a little more... fovX = fovY * Aspect Normally you want the Aspect (or aspect ratio) field of view to equal the aspect ratio of the viewport. Hope that helps Cheers, Steven -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=35629#35629 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [QUESTION]How Projection Referential Cameras Work in OSG?
Hi, You can setup this type of projection as long as u can set projection matrix for camera, there are nothing special in them. You can get matrix for assymetric frustum projection with osg::Matrix::frustum(). There are support for stereoscopic stuff in osg, so osg can manage stereo cameras for you, all you need is provide parameters like eye separation, screen distance, screen plane distance in scene coords (called fusion distance in osg) etc... Check osgviewer --help-env Cheers, Sergey -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=35631#35631 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] different rendering states for different passes?
Hi Peter, For situation like yours I would recommend overwriting osgShadow::LightSpacePerspectiveShadowMapVB and its internal ViewData class. Internal ViewData contains all the resources you need including shadowCamera. You may then add your own uniform or change any states used for shadow map prerender or final render. See StandardShadowMap::ViewData::init method to learn what states are set by these ShadowTechniques. Btw, if you look there you, will notice that shadow prerender pass overrides any program with fixed pipeline NULL program. So unless you set you shaders with PROTECTED attribute you may not need the uniform. I think we already wrote about overriding ViewDependentShadowTechniques in the past. If you look carefully you would find posts with neccessary example code. Cheers, Wojtek -Oryginalna wiadomość- From: Peter Amstutz Sent: Thursday, January 13, 2011 4:48 PM To: OpenSceneGraph Users Subject: [osg-users] different rendering states for different passes? Hello all, I have a bit of a knotty problem and was hoping for some advice. I am using OSG 2.8.3. I am using osgShadow::LightSpacePerspectiveShadowMapVB, which renders the scene in two passes; the prerender stage renders the shadow map, the main state renders the scene. My understanding is that the behavior of the two passes is controlled by setting different shader programs at the scene root, which sets the default shader program for the whole scene. However, I am also using shader programs at some of my leaf nodes. I would like it to accept shadows, so it needs to read the shadowTexture uniform. However, this uniform is only available on the main drawing pass, not the prerender pass (since the purpose of the prerender pass is to generate the shadow texture). The problem I am encountering is the fact that my shader program does not have a way to distinguish between executing the prerender pass and the main pass, and attempts to read the (non-existent) shadowTexture uniform in the prerender pass, which causes a GL error and results in the node not showing up at all. I know the solution is to use different shaders for different passes, but I haven't figured out the right way to set up OSG to do this at the leaf. Can anyone point me in the right direction? -- Peter Amstutz Senior Software Engineer Technology Solutions Experts Natick, MA 02131 ___ 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] NVidiaTextureTools integration moved from VPB to OSG
Hi All, Back in September last year Fabien Lavignotte submitted support for using NVidiaTexureTools SDK within VPB for compressing and generating of mipmaps, this support neatly removes the need for a graphics contexts to be required by VPB. At the time I mentioned my desire to see this type of functionality migrated into the core OSG as plugin. Today I made it so :-) To integrate NVTT with the I have introduced a new osgDB::ImageProcessor interface class, that is equivalent to existing osgDB::ReaderWriter class, but for plugins to implement image processing for us instead of loading. You can access any available ImageProcessor implementation via osgDB::Registry via : osgDB::ImageProcessor* imageProcessor = osgDB::Registry::instance()-getImageProcessor(); With the method the Registry will return the first available ImageProcessor that has been registered with it, and if it doesn't have available yet it'll try to load the nvtt plugin, and if this succeeds it'll return ImageProcessor that it implements. This design allows applications to remain decoupled from NVTT, and allow other implementations to be added down the line. The NVTT plugin is only compiled if your have NVTT SDK installed on your system, so there isn't any new dependency added to the OSG in it's default build. Now the NVTT support is integrated into OSG, VPB now longer needs to explicitly link to NVTT, so I've replaced the previously hardwired code to now use the new ImageProcessor interface provided by osgDB. I've been testing VPB builds using the new mechanism and so far all looks to be working as before. The nice thing is that VPB is no longer coupled to NVTT so there isn't any optional compile paths required, VPB can determine at runtime whether it has access to an ImageProcessor implementation and can fallback to using the old GL context based compression code when none is available. All these changes are now checked into svn/trunk of OSG and VPB (you'll need to update both). Wider testing would be appreciated ;-) Cheers, Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [ANN] New book published - OpenSceneGraph 3.0 Beginner's Guide
Hello dear OSG-community, Later i will buy it ~Thanks Rui Best regards, Dromouse -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=35620#35620 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] NVidiaTextureTools integration moved from VPB to OSG
Hi Robert, does it work with Nvidia texture tools 2 (newest release) ? Thank you! Cheers, Torben -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=35634#35634 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
