Hi J-S, Just as another datapoint, I also implemented outlining in a similar way to osgFX::Effect. All times stay the same except draw which triples. In my application, this doesn't affect me too much and I still make 60 fps if an object is selected or not, so I don't mind the jump that much, but I can see it being a problem if you have a very flexible scene/selection strategy...
Cheers, Morne On Wed, Nov 26, 2008 at 2:40 PM, Jean-Sébastien Guay <[EMAIL PROTECTED]> wrote: > Hi Robert, > >> I presume that you won't be selecting too many objects in the scene, >> so it's not like you'll be doubling the cost of the whole scene, and >> if there is only one object in the scene that you select you are >> unlikely to be breaking frame... > > Well, that assumption is one I can't make... Since this is an application > similar to a modeling application, the user could load anything up. And yes, > we support multi-select, so the user could conceivably select the whole > scene. > > Now, of course if the user loads objects which bring their system to a > crawl, I can't do anything to prevent that. However, if they load up objects > and the app just barely make frame, and then selects one of them and it > suddenly breaks frame, it makes our app look bad. It's a contrived example, > but it could really happen. And that's supposing they only select that one > object - they could select them all, and then the total frame time might > triple (I haven't tested this, but my results with multiple objects seem to > indicate that would be the result). > > Anyways, the more general question: why is the frame time so affected by > such a simple effect? As I said, it's a two-pass effect, I would expect the > time for the selected object(s) to double, but not more... And I disable > lighting, blending, texturing for the second pass, so I would think that > pass would be quicker than the first. > > Thanks, > > J-S > -- > ______________________________________________________ > Jean-Sebastien Guay [EMAIL PROTECTED] > http://www.cm-labs.com/ > http://whitestar02.webhop.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
