[osg-users] Distance point to geometry
Hi all, Looking in the archives I didn't get any interesting answer so here is the question : Is there any way using OSG to compute the distance between a graph and a point ? (not just with the vertices but also with edges and the triangles) I could implement my own visitor to traverse all element (vertex, ege and face) but I'm looking for something more optimized or more easy to do in a few days if possible... Thanks. Regards, Vincent. -- ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Frame syncing over multiple contexts
Hi Anna, This should work out of the box - the two windows should be rendering and synchronised. How are you setting up your viewer and graphics contexts? A a general note, if you are using a single graphics card for best performance one usually tries to use a single graphics window and have two cameras or more share this context. Is there a reason why you need two separate windows rather than a single window with two views? Robert. On 14 January 2012 21:21, Anna Sokol annaso...@gmail.com wrote: Hi, I am trying to figure out how to keep multiple graphics contexts in frame sync. My operating system is Windows XP SP3. My graphics is NVidia Quadro NVS 290 with the latest driver 276.42. I'm using OpenSceneGraph 3.0.1 compiled with Visual C++ 2005 for win32. I have vsync on in the driver and in Traits, also I am using a CullDrawThreadPerContext as the threading model. I have 2 graphics windows with separate contexts showing the same scene with a left and right view on one display. I have the scene moving across both windows so that I can see if its properly syncing. It sometimes visibly looks to be a number of frames out of sync (i.e. one of the rendered context is dragging behind). What could be causing this? In the threads? Or down in the graphics card? Is there any specific settings I should set to make the rendered contexts stay in frame sync? Regards, Anna Sokol _ Once we accept our limits, we go beyond them. -- Albert Einstein ___ 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] Place axes at corner
Hi Clement, On 16 January 2012 06:14, clement@csiro.au wrote: I have created axes to display on viewer, but I have no idea to place it at the bottom corner of the view. Anyone know how to location the corner of the view? Many thanks. Have a look at the osghud example. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] osgvolume opacity settings
Hi Clement, On 16 January 2012 06:21, clement@csiro.au wrote: My application is using osgvolume to display CT data. There is class called CompositeProperty and there are three property classes (AlphaFuncProperty, SampleDensityProperty and TransparencyProperty) as well. I would like to know more details of those classes and how to apply on osgvolume. I did to follow the example to use those classes, but when I changed the value of SampleDensityProperty from 0.05 to 0.5. Some CT data are disappear, so I would like to know more how to control property values. Many thanks. AlphaFuncProperty is equivalent to glAlphaFunc and sets the alpha value below which fragments will be discarded TransparencyProperty is an alpha value multiplier that you can use to make your volume more transparent. SampleDensityProperty controls the size of the step during the ray tracing through the volume, the lower the value the more samples, the higher the value the less the samples. If you use a value of 0.5 you'll only get 3 samples which clearly won't be enough! Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Help:Is there a way for a single fragment to know its index during per-fragment operation?
Hi If that makes any difference, by default coordinates contained in gl_FragCoord point to pixel center, so for leftmost-bottom pixel you will get (0.5, 0.5). If you need integer value you'll get correct result with ivec2(floor(gl_FragCoord.xy)) Cheers 14.01.2012, 23:57, Sebastian Messerschmidt sebastian.messerschm...@gmx.de: Hi Shuiying, The fragments coordinates(or index as you call it) can be accessed via gl_FragCoord. This will give unnormalized device coordinates (i.e. [0,xRes] [0,yRes]) which are also called window relative coordinates If you pass your screen resolution as uniform vec2 you can normalize them to device coordinates easily. cheers Sebastian Hello, In fragment shader, I would like to chage the fragment colour according to the fragment's index. Here index means integer number pair(x,y), where 0xxRes, 0yyRes, provided that viewPort has xRes * yRes pixels. Is there a way to achieve that? Thank you in advance! Shuiying ___ 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] Distance point to geometry
Hi Vincent, I'm not clear on what you are after, but I can say that there isn't anything close to resembling what you are talking about in the OSG so you'll need to roll your own visitor. Robert On 16 January 2012 08:36, Vincent Bourdier vincent.bourd...@gmail.com wrote: Hi all, Looking in the archives I didn't get any interesting answer so here is the question : Is there any way using OSG to compute the distance between a graph and a point ? (not just with the vertices but also with edges and the triangles) I could implement my own visitor to traverse all element (vertex, ege and face) but I'm looking for something more optimized or more easy to do in a few days if possible... Thanks. 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] Distance point to geometry
Hi Robert, Sorry if I was not clear : I'm just looking for a way to compute the smallest distance between a point and a geometry, not just a point to vertex distance, but also a point to edge or point to face (orthogonal projection). Due to the few days I have I think this won't be possible and safe... Thanks. Regards, Vincent. Le 16/01/2012 10:26, Robert Osfield a écrit : Hi Vincent, I'm not clear on what you are after, but I can say that there isn't anything close to resembling what you are talking about in the OSG so you'll need to roll your own visitor. Robert On 16 January 2012 08:36, Vincent Bourdiervincent.bourd...@gmail.com wrote: Hi all, Looking in the archives I didn't get any interesting answer so here is the question : Is there any way using OSG to compute the distance between a graph and a point ? (not just with the vertices but also with edges and the triangles) I could implement my own visitor to traverse all element (vertex, ege and face) but I'm looking for something more optimized or more easy to do in a few days if possible... Thanks. 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] Distance point to geometry
Vincent Bourdier vincent.bourd...@gmail.com writes: Hi Robert, Sorry if I was not clear : I'm just looking for a way to compute the smallest distance between a point and a geometry, not just a point to vertex distance, but also a point to edge or point to face (orthogonal projection). That is a common problem in robotics and computational geometry. This should get you started with a choice of algorithms that might suit you: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.46.8005rep=rep1type=pdf Cheers, Philipp Moeller Due to the few days I have I think this won't be possible and safe... Thanks. Regards, Vincent. Le 16/01/2012 10:26, Robert Osfield a écrit : Hi Vincent, I'm not clear on what you are after, but I can say that there isn't anything close to resembling what you are talking about in the OSG so you'll need to roll your own visitor. Robert On 16 January 2012 08:36, Vincent Bourdiervincent.bourd...@gmail.com wrote: Hi all, Looking in the archives I didn't get any interesting answer so here is the question : Is there any way using OSG to compute the distance between a graph and a point ? (not just with the vertices but also with edges and the triangles) I could implement my own visitor to traverse all element (vertex, ege and face) but I'm looking for something more optimized or more easy to do in a few days if possible... Thanks. 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 mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problem with corrupted textures when sharing instances of models loaded from IVE format.
Hi all I'm gonna add my 5 cents on this topic. I was having similar problems in app which recreates viewer in runtime (there are preview window and viewer created when widget shows up), using osg version 3.0(?). In my case problem was not only with textures - i was getting corrupted vertex arrays after viewer re-creation. I tried some voodoo magic with osgDB::Registry and caching settings, tried to clear gl objects with osg::deleteAllGLObjects() osg::flushAllDeletedGLObjects() etc, but without any luck. I've had different graphics context ids after viewer recreation. In my case problem was solved when using vertex buffer objects instead of display lists, i didnt dig any further after that. IIRC problem was showing itself only on windows, but i cant say for sure now. Cheers 14.01.2012, 14:58, Robert Osfield robert.osfi...@gmail.com: Hi Chris, On 14 January 2012 09:30, Chris Denham c.m.den...@gmail.com wrote: Hi Robert, To answer your question about how I manage the graphics contexts. I just create a new one for the window handle provided by each instance of my browser plugin e.g Code: traits-inheritedWindowData = new WindowData(hWnd); gc = osg::GraphicsContext::createGraphicsContext(traits); After gc is assigned check the value of gc-getState()-getContextID() for each of the contexts created. In theory for multiple contexts they should read 0,1,2,etc. Robert. ___ 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] Problem with corrupted textures when sharing instances of models loaded from IVE format.
Hi Robert, Yep, I can confirm the return value of gc-getState()-getContextID() is increasing as you describe for each brower plugin instance created. Does that mean I should be ok sharing scengraph between viewers? It certainly seems ok now I've disabled the unref images after apply flag on the textures. Chris Denham. robertosfield wrote: Hi Chris, On 14 January 2012 09:30, Chris Denham wrote: Hi Robert, To answer your question about how I manage the graphics contexts. I just create a new one for the window handle provided by each instance of my browser plugin e.g Code: traits-inheritedWindowData = new WindowData(hWnd); gc = osg::GraphicsContext::createGraphicsContext(traits); After gc is assigned check the value of gc-getState()-getContextID() for each of the contexts created. In theory for multiple contexts they should read 0,1,2,etc. Robert. ___ osg-users mailing list http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- Post generated by Mail2Forum -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=44855#44855 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG website unresponsive
Hi Reobert, openscenegraph is a user I created, there is no osg project on github :-) -- Mathieu On 13 January 2012 20:16, Robert Osfield robert.osfi...@gmail.com wrote: HI Mathieu, On 13 January 2012 17:29, Mathieu MARACHE math...@marache.com wrote: Sure, I'll create the mirror for http://www.openscenegraph.org/svn/VirtualPlanetBuilder, add it to the openscenegraph I created on github, and transfer the ownership of the project when you want to do the transition from svn to git. I'd be inclined to suggest that creating a new project for VirtualPlanetBuilder would be more appropriate than nesting t within osg. I'll lean a bit more about git and github and if I get brave I'll create a VPB project and see if I can import from svn. I don't think that a mirror of existing svn won't be required as I can probably just move wholesale across. Robert. ___ 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] Frame syncing over multiple contexts
Hi Anna, Robbert, I think the bufferswaps on window are by default not synchronized, a call to wglJoinSwapGroupNV(HDC hdc, GLuint group) is needed to make different windows synchronize. the osg lib has the code to make the call, just set traits-swapGroupEnabled = true; before createGraphicsContext(traits); Output should look like: (set OSG_NOTIFY_LEVEL=INFO) GraphicsCostEstimator::calibrate(..) GraphicsWindowWin32::setSyncToVBlank on GraphicsWindowWin32::wglJoinSwapGroupNV (0) returned 1 GraphicsWindowWin32::wglBindSwapBarrierNV (0, 0) returned 0 the wglBindSwapBarrierNV fails if you don't have a gsync card (hardware connection card for multiple graphics cards) Still, as Robbert says, a single graphics window is likely to perform better, and is of course automatically in sync. But I suppose you don't want fullscreen with stereo mode VERTICAL_SPLIT. Laurens. On 1/16/2012 10:17 AM, Robert Osfield wrote: Hi Anna, This should work out of the box - the two windows should be rendering and synchronised. How are you setting up your viewer and graphics contexts? A a general note, if you are using a single graphics card for best performance one usually tries to use a single graphics window and have two cameras or more share this context. Is there a reason why you need two separate windows rather than a single window with two views? Robert. On 14 January 2012 21:21, Anna Sokolannaso...@gmail.com wrote: Hi, I am trying to figure out how to keep multiple graphics contexts in frame sync. My operating system is Windows XP SP3. My graphics is NVidia Quadro NVS 290 with the latest driver 276.42. I'm using OpenSceneGraph 3.0.1 compiled with Visual C++ 2005 for win32. I have vsync on in the driver and in Traits, also I am using a CullDrawThreadPerContext as the threading model. I have 2 graphics windows with separate contexts showing the same scene with a left and right view on one display. I have the scene moving across both windows so that I can see if its properly syncing. It sometimes visibly looks to be a number of frames out of sync (i.e. one of the rendered context is dragging behind). What could be causing this? In the threads? Or down in the graphics card? Is there any specific settings I should set to make the rendered contexts stay in frame sync? Regards, Anna Sokol _ Once we accept our limits, we go beyond them. -- Albert Einstein ___ 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] Problem with corrupted textures when sharing instances of models loaded from IVE format.
Hi Hybr, Corrupted vertex arrays? Do you mean the OpenSceneGraph geometry data, or a problem with the OGL compiled display list? I've not seen that, and I hope I don't. ;-) I'll keep an eye out for trouble though. Cheers, Chris. hybr wrote: Hi all I'm gonna add my 5 cents on this topic. I was having similar problems in app which recreates viewer in runtime (there are preview window and viewer created when widget shows up), using osg version 3.0(?). In my case problem was not only with textures - i was getting corrupted vertex arrays after viewer re-creation. I tried some voodoo magic with osgDB::Registry and caching settings, tried to clear gl objects with osg::deleteAllGLObjects() osg::flushAllDeletedGLObjects() etc, but without any luck. I've had different graphics context ids after viewer recreation. In my case problem was solved when using vertex buffer objects instead of display lists, i didnt dig any further after that. IIRC problem was showing itself only on windows, but i cant say for sure now. Cheers -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=44857#44857 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problem with corrupted textures when sharing instances of models loaded from IVE format.
I've destroyed complete scene with viewer and graphics context, and recreated it all with reading new models from files with disabled cache etc. On first run all was ok, and on next runs mesh would look all distorted (some vertices of mesh randomly displaced etc). Dont know if it problem with display lists or geometry data arrays in osg, but display lists should be brand new each time, because i've deleted all opengl objects before shutting down graphics context, and new context have different id, also object cache disabled, cleared and model reloaded each time from file, so there shouldn't be problem with osg data arrays. I have no idea what goes wrong. Cheers 16.01.2012, 14:52, Chris Denham c.m.den...@gmail.com: Hi Hybr, Corrupted vertex arrays? Do you mean the OpenSceneGraph geometry data, or a problem with the OGL compiled display list? I've not seen that, and I hope I don't. ;-) I'll keep an eye out for trouble though. Cheers, Chris. hybr wrote: Hi all I'm gonna add my 5 cents on this topic. I was having similar problems in app which recreates viewer in runtime (there are preview window and viewer created when widget shows up), using osg version 3.0(?). In my case problem was not only with textures - i was getting corrupted vertex arrays after viewer re-creation. I tried some voodoo magic with osgDB::Registry and caching settings, tried to clear gl objects with osg::deleteAllGLObjects() osg::flushAllDeletedGLObjects() etc, but without any luck. I've had different graphics context ids after viewer recreation. In my case problem was solved when using vertex buffer objects instead of display lists, i didnt dig any further after that. IIRC problem was showing itself only on windows, but i cant say for sure now. Cheers -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=44857#44857 ___ 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] Problem with corrupted textures when sharing instances of models loaded from IVE format.
Hi Chris, On 16 January 2012 10:39, Chris Denham c.m.den...@gmail.com wrote: Yep, I can confirm the return value of gc-getState()-getContextID() is increasing as you describe for each brower plugin instance created. Does that mean I should be ok sharing scengraph between viewers? It should be OK. osgViewer hasn't been designed for using of multiple viewers running in a parallel, but is designed for scene graphs to be shared between multiple contexts, so as long as the ContextID's a mapped correctly, as it sounds like they are. It certainly seems ok now I've disabled the unref images after apply flag on the textures. If this is the case then the max number of contexts that the unref scheme is using is obviously not high enough. osgViewer will look at the number of contexts that are active and then using this as a limit. Is it that you are creating one viewer and context then drawing frames, then later creating a new context and draw more frames. In the later case I can certainly see that if the first frames draw will release the osg::Image resources assigned to osg::Texture if they are set up to unref the images, so disabling the unref of images makes sense. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problem with corrupted textures when sharing instances of models loaded from IVE format.
Hi Sergey, 2012/1/16 Sergey Polischuk pol...@yandex.ru: I've destroyed complete scene with viewer and graphics context, and recreated it all with reading new models from files with disabled cache etc. On first run all was ok, and on next runs mesh would look all distorted (some vertices of mesh randomly displaced etc). Dont know if it problem with display lists or geometry data arrays in osg, but display lists should be brand new each time, because i've deleted all opengl objects before shutting down graphics context, and new context have different id, also object cache disabled, cleared and model reloaded each time from file, so there shouldn't be problem with osg data arrays. I have no idea what goes wrong. If you are bypassing much of osgViewer's context management then it's possible to get the GL obejct caches that the OSG uses out of sync with what you are doing. osgViewer does a range of operations to clean up contexts and make sure the the GL object caches that the OSG uses are flushed. If you are manually managing your own contexts then you'll need to call releaseGLObjects() on your scene graph and call osg::flushAllDeletedGLObjects(contextID) prior to closing the context, if it this is outwith your control then calling discardAllGLObjects(contextID) enables the discarding of all the GL object caches. In the OSG the GL object caches are used to avoid problems with deleting OpenGL objects in other threads than the graphics contexts ones - as scene graphs can be deleted in any thread you need to cache, the cache is also used to enable reuse of OpenGL objects like texture objects and vbo's where possible, this is something that is very useful for paging performance. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Export a vertex animation
Hi, I'm Angel, How I can export a vertex animation from 3d studio to load in osg? ... I usally exported in a ive file format ... maybe I should use a different file format. Thanks. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problem with corrupted textures when sharing instances of models loaded from IVE format.
Hi, Robert If it'll help to understand where problem might be - there are some details: I dont use any opengl functions directly, so i think osg management of opengl objects should be ok. Here some code i used to setup viewer on creation: On viewer init : graphicsWindow = new osgViewer::GraphicsWindowEmbedded(0,0,width(),height()); viewer-getCamera()-setViewport(new osg::Viewport(0,0,width(),height())); viewer-getCamera()-setGraphicsContext(graphicsWindow); viewer-setThreadingModel(osgViewer::Viewer::SingleThreaded); prior to destructing viewer i used next piece of code (which wasn't there initially, i added this when was trying to fight issue with model corruption, and it actually didnt make any difference): unsigned id = m_Ui.viewer-getCamera()-getGraphicsContext()-getState()-getContextID(); m_Ui.viewer-m_GraphicsWindow-makeCurrent(); osg::deleteAllGLObjects(id); osg::flushAllDeletedGLObjects(id); osg::discardAllGLObjects(id); osgDB::Registry::instance()-clearObjectCache(); osgDB::Registry::instance()-clearArchiveCache(); Scene recreated (without reusing old objects) each time new viewer created. 16.01.2012, 15:35, Robert Osfield robert.osfi...@gmail.com: Hi Sergey, 2012/1/16 Sergey Polischuk pol...@yandex.ru: I've destroyed complete scene with viewer and graphics context, and recreated it all with reading new models from files with disabled cache etc. On first run all was ok, and on next runs mesh would look all distorted (some vertices of mesh randomly displaced etc). Dont know if it problem with display lists or geometry data arrays in osg, but display lists should be brand new each time, because i've deleted all opengl objects before shutting down graphics context, and new context have different id, also object cache disabled, cleared and model reloaded each time from file, so there shouldn't be problem with osg data arrays. I have no idea what goes wrong. If you are bypassing much of osgViewer's context management then it's possible to get the GL obejct caches that the OSG uses out of sync with what you are doing. osgViewer does a range of operations to clean up contexts and make sure the the GL object caches that the OSG uses are flushed. If you are manually managing your own contexts then you'll need to call releaseGLObjects() on your scene graph and call osg::flushAllDeletedGLObjects(contextID) prior to closing the context, if it this is outwith your control then calling discardAllGLObjects(contextID) enables the discarding of all the GL object caches. In the OSG the GL object caches are used to avoid problems with deleting OpenGL objects in other threads than the graphics contexts ones - as scene graphs can be deleted in any thread you need to cache, the cache is also used to enable reuse of OpenGL objects like texture objects and vbo's where possible, this is something that is very useful for paging performance. Robert. ___ 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] Distance point to geometry
Hi Robert, Le 16/01/2012 10:53, Robert Osfield a écrit : You'd implement a NearestGeometryIntersector that holds a point that you test your osg::Geometry against, using a osg::TriangleFunctor like the LineSegmentIntersector would allow you to simply the work down to just a test of the point against a triangle. To make things efficient you'll need to build in testing against the bounding volumes against the point to decide whether it's contains any points that could be closer than the current closest distance detected. Thanks for the idea I'll will start with that. How could I implement the test against bounding volumes ? Because it is a visitor, the intersect method will be called on each drawable if I understand it well. Ho can I use the Intersector base to make a previous sort to keep only the nearest geometries or drawable base, before having the triangle functor traversing the datas ? Thanks. Regards, Vincent. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] osgUtil::Optimizer and transparent objects
Hello, I've encountered a problem when using the OpenFlight plugin with preserveFace/preserveObject option not used. If the perserveFace options is not used, the importer uses the Optimizer with the following options: osgUtil::Optimizer::SHARE_DUPLICATE_STATE | osgUtil::Optimizer::MERGE_GEOMETRY | osgUtil::Optimizer::MERGE_GEODES | osgUtil::Optimizer::TESSELLATE_GEOMETRY | osgUtil::Optimizer::STATIC_OBJECT_DETECTION; This unfortunately breaks the sorting of transparent objects, as in my example all forests (represented by simple quads/polygons) are put into one geode. After digging into the optimizer, I realized, that it will not check if the statesets contain any transparency. Would you consider this rather a bug in the Optimizer or more a mis-usage in the OpenFlight importer? As the osgviewer doesn't disable depth writes for transparent objects, the problem is only visible if you use the transparent-bin with depth writes off, which leads me to another question: Would it be wise to turn off depth writes for the transparent bin by default ( or a least make it configurable for the osgviewer)? cheers Sebastian ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Help: LineSegmentIntersector operates in GPU or CPU?
Hello, I am really sorry to trouble you again with my naive questions. :-) (1)Where does LineSegmentIntersector carry out its intersection? In GPU or CPU? (2) How can I know which processes happen in GPU, which ones in CPU? (perhaps only draw traversal happens in GPU?) (3)How can I check the rendering rates of my osg programm? Is it invariant during run time or does it remain constant? Thank you very much in advance! Shuiying ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problem with corrupted textures when sharing instances of models loaded from IVE format.
Hi Robert, robertosfield wrote: Is it that you are creating one viewer and context then drawing frames, then later creating a new context and draw more frames. In the later case I can certainly see that if the first frames draw will release the osg::Image resources assigned to osg::Texture if they are set up to unref the images, so disabling the unref of images makes sense. Yes, that's correct, other instances of the viewer may be created after an instance of the viewer has rendered a model, and those later instances may in turn need to render the same cached models. So, mystery solved I think. :-) Thanks. Chris Denham. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=44866#44866 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Help: LineSegmentIntersector operates in GPU or CPU?
wang shuiying shuiying.w...@fu-berlin.de writes: Hello, I am really sorry to trouble you again with my naive questions. :-) (1)Where does LineSegmentIntersector carry out its intersection? In GPU or CPU? Looking at the implementation of operator() in LineSegmentIntersection.cpp shows that it performs everything on the CPU. I could only find a CUDA implementation for the 2D case. (2) How can I know which processes happen in GPU, which ones in CPU? (perhaps only draw traversal happens in GPU?) (3)How can I check the rendering rates of my osg programm? Is it invariant during run time or does it remain constant? osg::Viewer has a osg::Stats property and also comes with osgViewer::StatsHandler which can print timings as a HUD display. Thank you very much in advance! Shuiying ___ 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] geometry indexes?
Hi Is there any easy way to find vertices's index for the shapes like Cone, Cube etc., in osg::shape? Otherwise, should it be done thru graph note book only? Thanks -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=44869#44869 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Distance point to geometry
Hi Robert, Thanks for you help. I think I can do something not so bad with that. Regards, Vincent. Le 16/01/2012 20:04, Robert Osfield a écrit : Hi Vincent, On 16 January 2012 14:55, Vincent Bourdiervincent.bourd...@gmail.com wrote: Thanks for the idea I'll will start with that. How could I implement the test against bounding volumes ? Have a look how src/osgUtil/InteresectionVisitor.cpp interacts with the osgUtil::Intersector that is assigned to it, and at the same time see how LineSegmentIntersectio/PolytopeIntersection etc implements the various functions that InversectionVisitor.cpp calls. Because it is a visitor, the intersect method will be called on each drawable if I understand it well. It does a bit more than that. The Intersection traversal has does intersections tests against bounding spheres, does reprojection of the intersector into the local coordinate frame beneath transforms. Ho can I use the Intersector base to make a previous sort to keep only the nearest geometries or drawable base, before having the triangle functor traversing the datas ? It's up to you how you want to manage this. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
