Hi Faraz, W.r.t continous (frame driven) vs events driven, the OSG can do both, as its up to your app to call Viewer::frame() (unless you use the high level Viewer::run to run the frame loop). The main problem with going event driven is that animations won't update continously and any database paging would become rather slow - if you don't use either of these it should be fine for an interactive app.
W.r.t coordinate system just place a MatrixTransform above you models to place them in large coord system. The models should have a local origin to keep floats nice a small. Robert. On 10/19/07, Faraz Ravi <[EMAIL PROTECTED]> wrote: > > > > > Hi All > > > > I'm taking a look at OSG and I really like what it offers. I am looking to > possibly use it in a CAD like environment where it is windowed and there is > no continuous rendering loop. Rendering is performed as and when it is > required, for example if the viewpoint is changed. This is important since > the scene may take 0.5s or more to render and is degraded for higher fps > during movement. > > > > I've adapted the fltk example to test this and it seems to work fine. So > what I wanted to know is: > > > > 1. Does OSG have any internal dependencies on a continuous rendering > loop? > > 2. Are there any known uses of OSG like this, or in a similar > environment? > > 3. Is there anything else I need to be aware of if I am doing this? > > > > Note that when there is a continuous rendering loop in the fltk example the > UI performance is hit badly, ie menus slow down and so on – it would also > hit any CPU processes so this is not really a realistic model for my > application. > > > > I noticed osgDirector uses a continuous loop with wxWidgets, seems to work > quite well. I guess its rendering in another thread. > > > > On a different note does anyone know what method OSG uses to manage > coordinate truncation / scaling issues when dealing with the teapot in the > desert like scenario? Does it performance multiple passes or is there a > different coordinate frame for each scale? Lets say I wanted to show a > building in a large landscape without losing coordinate precision in the > building for example. > > > > > > Thanks for any help > > > > Faraz > > > > > > > > > > > > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
