Re: [osg-users] Extracting modelview matrix from main loop
Hi, thanks for the reply. I have implemented all sorts of particle functionality (tris, lines, quads) already therefore I prefer to port the code (if possible) initially as is and enhence it further after that. Any idea how to get the modelview matrix? Thanks Dimi - Original Message From: Robert Osfield robert.osfi...@gmail.com To: OpenSceneGraph Users osg-users@lists.openscenegraph.org Sent: Tuesday, May 19, 2009 4:52:42 PM Subject: Re: [osg-users] Extracting modelview matrix from main loop Hi Dimi, How about just using rendering the particle system as points and use osg::PointSprite to create screen align quads? This would avoid the for local transforms completely. Robert. On Tue, May 19, 2009 at 1:03 PM, dimi christop dimi_chris...@yahoo.com wrote: Hi, I am trying to port my old OGL Performer, Particle system code. How do I extract the modelview matrix in the main loop for a specific node? Essentially i am interrested in aquiring the modelview matrix at a specific node in the scene graph in order to transform the particle quads to be screen aligned. Thanks Dimi ___ 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] Extracting modelview matrix from main loop
On Wed, May 20, 2009 at 9:07 AM, dimi christop dimi_chris...@yahoo.com wrote: thanks for the reply. I have implemented all sorts of particle functionality (tris, lines, quads) already therefore I prefer to port the code (if possible) initially as is and enhence it further after that. Any idea how to get the modelview matrix? From the CullVisitor you just do cullvistor-getModelViewMatrix() which passes back a pointer to a RefMatrix (which is just a Matrix with reference counting.) You can get the CullVisitor by dynmaically casting the NodeVistor passed in to the Node::traverse() method or the node callback. Have a search through OSG sources to see example of this being done. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Extracting modelview matrix from main loop
Hi, I am trying to port my old OGL Performer, Particle system code. How do I extract the modelview matrix in the main loop for a specific node? Essentially i am interrested in aquiring the modelview matrix at a specific node in the scene graph in order to transform the particle quads to be screen aligned. Thanks Dimi ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Extracting modelview matrix from main loop
You can use AutoTransform for billboard-like effects. Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com +1 303 859 9466 -Original Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of dimi christop Sent: Tuesday, May 19, 2009 6:04 AM To: OpenSceneGraph Users Subject: [osg-users] Extracting modelview matrix from main loop Hi, I am trying to port my old OGL Performer, Particle system code. How do I extract the modelview matrix in the main loop for a specific node? Essentially i am interrested in aquiring the modelview matrix at a specific node in the scene graph in order to transform the particle quads to be screen aligned. Thanks Dimi ___ 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] Extracting modelview matrix from main loop
On Tue, May 19, 2009 at 2:49 PM, Paul Martz pma...@skew-matrix.com wrote: You can use AutoTransform for billboard-like effects. Bit you wouldn't want to use an AutoTransform for each particle... ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Extracting modelview matrix from main loop
Hi Dimi, How about just using rendering the particle system as points and use osg::PointSprite to create screen align quads? This would avoid the for local transforms completely. Robert. On Tue, May 19, 2009 at 1:03 PM, dimi christop dimi_chris...@yahoo.com wrote: Hi, I am trying to port my old OGL Performer, Particle system code. How do I extract the modelview matrix in the main loop for a specific node? Essentially i am interrested in aquiring the modelview matrix at a specific node in the scene graph in order to transform the particle quads to be screen aligned. Thanks Dimi ___ 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
