Re: [osg-users] Ideas for glow effects on 3D objects
Or you could just use a billboard glow texture, disable depth sorting and testing and render the glowing billboard last on top of everything else. This is the way we used to do it when we had no shaders and post processing Dimi - Original Message From: Art Tevs arti_t...@yahoo.de To: osg-users@lists.openscenegraph.org Sent: Friday, May 15, 2009 1:05:11 AM Subject: Re: [osg-users] Ideas for glow effects on 3D objects Hi Paul, as other Paul said, take a look into osgPPU. There I have an example showing exactly what you need. The example is simple and very easy to understand. You can take this as a starting point and then change it for your needs. Cheers, Art -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12159#12159 ___ 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] Ideas for glow effects on 3D objects
dimi christop wrote: Or you could just use a billboard glow texture, disable depth sorting and testing and render the glowing billboard last on top of everything else. This is the way we used to do it when we had no shaders and post processing Yep. Works great with blend mode set to add, so it appears luminous. Less plumbing and book-keeping than shaders. Dimi -- Chris 'Xenon' Hanson, omo sanza lettere Xenon AlphaPixel.com PixelSense Landsat processing now available! http://www.alphapixel.com/demos/ There is no Truth. There is only Perception. To Perceive is to Exist. - Xen ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Ideas for glow effects on 3D objects
Hi Paul -- The too many gpu cycles requirement is a little vague. I assume as long as you still hit 60Hz, then any algorithm is fair game. You could use MRT (multiple render targets) in a shader to create both a normal image and a glow map, then do some kind of osgPPU-like post processing to apply a Gaussian blur to the glow map along the lines of what is described in GPU Gems. Then merge the normal image and blurred glow map in a final render pass. A client of mine implemented something like this not too long ago based on some small examples I wrote for them, and the visual effect is quite nice. 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 Paul Griffiths Sent: Thursday, May 14, 2009 2:20 PM To: osg-users@lists.openscenegraph.org Subject: [osg-users] Ideas for glow effects on 3D objects Hi, Im creating a music application, below is a screenshot, im after a glow effect for my enabled buttons. does anyone have any ideas? Anything goes just don't want to use up too many gpu cycles though. [Image: http://img401.imageshack.us/img401/8212/pichbu.jpg ] ... Thank you! Cheers, PaulG -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12150#12150 ___ 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] Ideas for glow effects on 3D objects
Hi Paul, I would suggest that you check the nvidia shader library where there are many glow effects. Usually it is done in screen space with some blur and additive colouring. http://developer.download.nvidia.com/shaderlibrary/webpages/shader_library.html bill From: osg-users-boun...@lists.openscenegraph.org on behalf of Paul Griffiths Sent: Thu 5/14/2009 4:19 PM To: osg-users@lists.openscenegraph.org Subject: [osg-users] Ideas for glow effects on 3D objects Hi, Im creating a music application, below is a screenshot, im after a glow effect for my enabled buttons. does anyone have any ideas? Anything goes just don't want to use up too many gpu cycles though. [Image: http://img401.imageshack.us/img401/8212/pichbu.jpg ] ... Thank you! Cheers, PaulG -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12150#12150 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org winmail.dat___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Ideas for glow effects on 3D objects
Hi Paul, as other Paul said, take a look into osgPPU. There I have an example showing exactly what you need. The example is simple and very easy to understand. You can take this as a starting point and then change it for your needs. Cheers, Art -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12159#12159 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
