On a similar note, does anyone know what the performance costs of adding/removing nodes from the scene graph at runtime are compared to, say, using a Switch or manipulating NodeMasks to hide objects? That is, is the performance hit from adding/removing nodes greater or less than any loss in performance due to "ignoring" existing (but temporarily unwanted) nodes? For the sake of this discussion, assume that a good number of nodes are involved - not just a few here or there.
I was planning on running some tests myself on this subject, but since this question came up, I thought I'd see if anyone else has already looked into this. Matthew W. Fuesz Software Engineer Asc. Lockheed Martin STS 1210 Massillon Road Akron, OH 44315 [EMAIL PROTECTED] ________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Thrall, Bryan Sent: Thursday, June 19, 2008 1:27 PM To: [EMAIL PROTECTED]; OpenSceneGraph Users Subject: Re: [osg-users] Adding a child to a node at runtime. James Reid wrote on Thursday, June 19, 2008 12:13 PM: > Howdy! > > When I try to add a child to a node at runtime I get an exception. > Unfortunately, the exception dies quietly so I'm not sure what the actual > exception is. I know I've done this before (a long time ago) and things have > changed since then, so I'm not sure what I'm doing wrong. Here's the setup > of our app. > > We're rendering on a managed window using managed c++ > We have a button that enables/disable certain graphics to be drawn. > To do the hiding of a graphic, I remove the geode from it's parent node. > To do the showing of a graphic, I add the geode to the parent. <- this causes > the exception > > We're building a simulation and our users can toggle certain graphics on/off. > For example, they can view graphic, physics, center of mass, constraints, > etc... They can view any number of these at any time. > > My current set up is I have a Geode for each representation. I then > add/remove that geode depending on the display settings. > > Is this the wrong setup? I've searched for similar solutions and haven't > really found anything. Maybe I'm looking in the wrong places? It isn't safe to modify the scenegraph during the cull and draw passes; it's best to use a UpdateCallback, or to replace your call to frame() with your own that modifies the scenegraph before doing the cull and draw. There are other ways to show/hide geometry, such as the node mask or a CullCallback; not that what you're doing is wrong, but perhaps they might do what you want better. -- Bryan Thrall FlightSafety International [EMAIL PROTECTED] _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or g
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