the radius determines the pixel for which the sigma is used. once you are on the edges of the kernel (gauss curve approaches 0), you can stop blurring.
this will be around 2.5 - 3 times sigma. the correct sigma depends on the effect intended, try different sigmas ranging from 2-15 and radius = 2.5 * sigma (maybe you can attach a slider to interactively determine the best value.) René 2011/11/24 Jean-Sébastien Guay <jean-sebastien.g...@cm-labs.com> > Hello René, > > > also notice that the radius should be about 2.5 - 3 times sigma to make >> sure >> the entire kernel is used instead of cutoff by the radius. >> > > The default values in the osgPPU hdr example are sigma = 4.0 and radius = > 7.0, however I have not seen a difference between radius = 7.0, 15.0 and > 200.0... So there I wonder if the values are getting to the shaders > correctly. > > What values would you suggest I use for good results? > > Thanks, > > > J-S > -- > ______________________________**________________________ > Jean-Sebastien Guay > jean-sebastien.guay@cm-labs.**com<jean-sebastien.g...@cm-labs.com> > http://www.cm-labs.com/ > > http://whitestar02.dyndns-web.**com/<http://whitestar02.dyndns-web.com/> > ______________________________**_________________ > osg-users mailing list > osg-users@lists.**openscenegraph.org <osg-users@lists.openscenegraph.org> > http://lists.openscenegraph.**org/listinfo.cgi/osg-users-** > openscenegraph.org<http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org> >
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