Thank you for your answer. can I find an example related to this idea ?
On Tue, Jun 7, 2011 at 1:27 PM, J.P. Delport <[email protected]> wrote:
> Hi,
>
> another option instead of drawing geometry would be to put your data into a
> texture (image) and then just visualise that. Using "nearest" sampling would
> give you little squares too.
>
> jp
>
>
> On 07/06/11 12:38, Sebastian Messerschmidt wrote:
>
>> From the first look I'd advise to split up the geometries and put them
>> into multiple nodes.
>> Looking at the code I don't know which limit you're hitting here, but
>> there are limits in the opengl implementations that might dissallow
>> buffers beyond certain sizes.
>>
>> cheers
>> Sebastian
>>
>>> Hi
>>>
>>> I have modified the createHUD function provided in the 'osgpick'
>>> example, for my application as below. Essentially i have to plot a
>>> matrix of values on the screen with each matrix entry represented by a
>>> square and its color represented by its value.
>>> The size of the matrix is 1615 x 1615. when i run the program, it
>>> takes a long time with a blank screen before giving a segmentation
>>> fault message.
>>>
>>> Can I get some help on this - the reason for the error and an
>>> efficient way to do this, because I may have to plot 6500 x 6500 sized
>>> matrices in the future. I have also posted the gdb output below.
>>> Thank you
>>>
>>>
>>> ======================================================================================================================
>>> modified createHUD function used in my application
>>>
>>> ____________________________________________________________________________________________________________________
>>>
>>> osg::Node* createHUD(osgText::Text* updateText, vector<vector<double>
>>> > & simmat, double max)
>>> {
>>>
>>> // create the hud. derived from osgHud.cpp
>>> // adds a set of quads, each in a separate Geode - which can be
>>> picked individually
>>> // eg to be used as a menuing/help system!
>>> // Can pick texts too!
>>>
>>> osg::Camera* hudCamera = new osg::Camera;
>>> hudCamera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
>>> hudCamera->setProjectionMatrixAsOrtho2D(0,3200,0,1600);
>>> hudCamera->setViewMatrix(osg::Matrix::identity());
>>> hudCamera->setRenderOrder(osg::Camera::POST_RENDER);
>>> hudCamera->setClearMask(GL_DEPTH_BUFFER_BIT);
>>>
>>> std::string timesFont("fonts/times.ttf");
>>>
>>> // turn lighting off for the text and disable depth test to ensure
>>> its always ontop.
>>> osg::Vec3 position(100.0f,1550.0f,0.0f);
>>> osg::Vec3 delta(0.0f,-60.0f,0.0f);
>>>
>>> osg::Geode* geode = new osg::Geode();
>>> osg::StateSet* stateset = geode->getOrCreateStateSet();
>>> stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
>>> stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
>>>
>>> for(int i=0; i<simmat.size(); i++)
>>> {
>>> for(int j=0; j<simmat[i].size(); j++)
>>> {
>>>
>>> osg::Geometry *quad=new osg::Geometry;
>>> osg::Vec3Array* vertices = new osg::Vec3Array(4);
>>> // 1 quad
>>> osg::Vec4Array* colors = new osg::Vec4Array;
>>> double colorval=simmat[i][j]/max;
>>>
>>> colors->push_back(osg::Vec4(colorval,colorval,colorval, 1.0));
>>> quad->setColorArray(colors);
>>>
>>> quad->setColorBinding(osg::Geometry::BIND_PER_PRIMITIVE);
>>> osg::Vec3 newpos=position+osg::Vec3(j,i,0);
>>> (*vertices)[0]=newpos;
>>> (*vertices)[1]=newpos+osg::Vec3(0.0f,-1.0f,0.0f);
>>> (*vertices)[2]=newpos+osg::Vec3(1.0f,-1.0f,0.0f);
>>> (*vertices)[3]=newpos+osg::Vec3(1.0f,0.0f,0.0f);
>>> quad->setVertexArray(vertices);
>>> quad->addPrimitiveSet(new
>>> osg::DrawArrays(osg::PrimitiveSet::QUADS,0,4));
>>> geode->addDrawable(quad);
>>> }
>>> }
>>>
>>>
>>>
>>> hudCamera->addChild(geode);
>>> return hudCamera;
>>>
>>> }
>>>
>>> ===================================================================================================
>>>
>>>
>>> ====================================================================================================
>>> GDB output:
>>>
>>> ____________________________________________________________________________________________________________________
>>>
>>> Starting program: /hemanth/Workspace/visualization/a.out
>>>
>>> /hemanth/Workspace/loop_closure/log_pavin25610_56_usurf128_delta4_tfidfm/matches
>>> [Thread debugging using libthread_db enabled]
>>> [New Thread 0xb7b48b70 (LWP 3756)]
>>>
>>> Program received signal SIGSEGV, Segmentation fault.
>>> [Switching to Thread 0xb7b48b70 (LWP 3756)]
>>> 0x01276690 in ?? () from /usr/lib/dri/swrast_dri.so
>>> (gdb) bt
>>> #0 0x01276690 in ?? () from /usr/lib/dri/swrast_dri.so
>>> #1 0x012767d8 in _mesa_NewList () from /usr/lib/dri/swrast_dri.so
>>> #2 0x002c1944 in osg::Drawable::compileGLObjects(osg::RenderInfo&)
>>> const () from /usr/local/lib/libosg.so.65
>>> #3 0x005ac85b in osgUtil::GLObjectsVisitor::apply(osg::Drawable&) ()
>>> from /usr/local/lib/libosgUtil.so.65
>>> #4 0x005ad461 in osgUtil::GLObjectsVisitor::apply(osg::Geode&) ()
>>> from /usr/local/lib/libosgUtil.so.65
>>> #5 0x002d7079 in osg::Geode::accept(osg::NodeVisitor&) () from
>>> /usr/local/lib/libosg.so.65
>>> #6 0x0030e7d4 in osg::Group::traverse(osg::NodeVisitor&) () from
>>> /usr/local/lib/libosg.so.65
>>> #7 0x005ad3db in osgUtil::GLObjectsVisitor::apply(osg::Node&) () from
>>> /usr/local/lib/libosgUtil.so.65
>>> #8 0x0034ff18 in osg::NodeVisitor::apply(osg::Group&) () from
>>> /usr/local/lib/libosg.so.65
>>> #9 0x0034fff8 in osg::NodeVisitor::apply(osg::Transform&) () from
>>> /usr/local/lib/libosg.so.65
>>> #10 0x00350018 in osg::NodeVisitor::apply(osg::Camera&) () from
>>> /usr/local/lib/libosg.so.65
>>> #11 0x002932f9 in osg::Camera::accept(osg::NodeVisitor&) () from
>>> /usr/local/lib/libosg.so.65
>>> #12 0x0030e7d4 in osg::Group::traverse(osg::NodeVisitor&) () from
>>> /usr/local/lib/libosg.so.65
>>> #13 0x005ad3db in osgUtil::GLObjectsVisitor::apply(osg::Node&) () from
>>> /usr/local/lib/libosgUtil.so.65
>>> #14 0x0034ff18 in osg::NodeVisitor::apply(osg::Group&) () from
>>> /usr/local/lib/libosg.so.65
>>> #15 0x003105d9 in osg::Group::accept(osg::NodeVisitor&) () from
>>> /usr/local/lib/libosg.so.65
>>> #16 0x0083b3d4 in osgViewer::Renderer::compile() () from
>>> /usr/local/lib/libosgViewer.so.65
>>> #17 0x00839713 in osgViewer::Renderer::draw() () from
>>> /usr/local/lib/libosgViewer.so.65
>>> #18 0x00835f77 in
>>> osgViewer::Renderer::operator()(osg::GraphicsContext*) () from
>>> /usr/local/lib/libosgViewer.so.65
>>> #19 0x0030a9c8 in osg::GraphicsContext::runOperations() () from
>>> /usr/local/lib/libosg.so.65
>>> #20 0x0030c84d in
>>> osg::RunOperations::operator()(osg::GraphicsContext*) () from
>>> /usr/local/lib/libosg.so.65
>>> #21 0x0030c9c5 in osg::GraphicsOperation::operator()(osg::Object*) ()
>>> from /usr/local/lib/libosg.so.65
>>> #22 0x00359c22 in osg::OperationThread::run() () from
>>> /usr/local/lib/libosg.so.65
>>> #23 0x0030ca49 in osg::GraphicsThread::run() () from
>>> /usr/local/lib/libosg.so.65
>>> #24 0x001ad45b in
>>> OpenThreads::ThreadPrivateActions::StartThread(void*) () from
>>> /usr/local/lib/libOpenThreads.so.11
>>> #25 0x0048f80e in start_thread (arg=0xb7b48b70) at pthread_create.c:300
>>> #26 0x00f5fa0e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130
>>> (gdb) q
>>>
>>> =============================================================================================================
>>>
>>> --
>>> Hemanth Korrapati,
>>> LASMEA,
>>> Universite Blaise Pascal,
>>> France.
>>> Mobile: +33 (0)650348239
>>> http://hemanth-k.co.in
>>>
>>>
>>> _______________________________________________
>>> osg-users mailing list
>>> [email protected]
>>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>>>
>>
>>
>>
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>>
>
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--
Hemanth Korrapati,
Doctoral Student,
LASMEA,
Universite Blaise Pascal,
Campus des Cezeaux
63170 Clermont-Ferrand,
France.
Mobile: +33 (0)650348239
http://hemanth-k.co.in
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