Hi Andi, It all depends upon the threading model you use with the Viewer. If you run SingleThreaded then you can modify the scene graph in your PostDrawCallback without worry as there will only be one thread working on the main scene graph. If you use DrawThreadPerContext which is the default, then potentially you have the draw thread still running while the next thread has already begun. If you use CullDrawThreadPerContext then the next frame won't start till all the the cull/draw threads are complete, but potentially you could have multiple threads running if you have multiple graphics contexts.
Using PostDrawCallback or FinalDrawCallback will not make a difference w.r.t thread safety as both are called from the draw thread, just slightly different points in the draw thread. What you do need to make sure is that threads aren't trying to read/write to the scene graph nodes at one time. The easiest way is to just update nodes in the main thread as part of the update phase, or just set the threading model to one that avoids overlap. Cheers, Robert. -- You received this message because you are subscribed to the Google Groups "OpenSceneGraph Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to osg-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/osg-users/CAFN7Y%2BXsWP9%3D6bVPRKOfjgxt89YmcL%2B-GRSzPZCL6%2BZN0Gbq9g%40mail.gmail.com.
