Slappo Svensson wrote: > So basically there's no way of telling whether or not > a scene will get rendered just as you're making > changes to it?
err... ahhhhh... yes and no.... If you are making modifications in a separate thread to the threads driven by Java3D, then yes, there is no guarantees. You have partially answered your own question in the next secion, so I'll move along to that: > How is this usually done? Are behaviors > run by the rendering thread or is there a way to > specify the frame rate you'd prefer and have the code > that makes changes to it wake up at the end of a > frame? Yes and yes. J3D has a behaviour system that is the prefered way of getting changes into the scene graph. Those behaviours can be "activated" in a number of ways. Take a look at the WakeUp*, *Condition and *Criteria classes in the Javadoc. What you are interested in might be something like WakeUpOnElapsedFrame(). This is a behaviour that gets woken every X frames (if you specify zero then it gets called every frame). During the time that this gets called you can safely assume all the changes get made in time for the next frame render cycle. If you are taking too long here, it will slow the render cycle down. If all you are doing is modifying geometry, then ther is another option for you. Have a look at the GeometryUpdater interface. Effectively, this is a callback mechanism. You tell J3D that you want to update something and then it calls you back when everything is fine. This is much smaller than a behaviour, but also requires more work on your part because there is less guarantee that all those callbacks coming from the j3d internals will actually be for the same frame. -- Justin Couch http://www.vlc.com.au/~justin/ Java Architect & Bit Twiddler http://www.yumetech.com/ Author, Java 3D FAQ Maintainer http://www.j3d.org/ ------------------------------------------------------------------- "Humanism is dead. Animals think, feel; so do machines now. Neither man nor woman is the measure of all things. Every organism processes data according to its domain, its environment; you, with all your brains, would be useless in a mouse's universe..." - Greg Bear, Slant ------------------------------------------------------------------- =========================================================================== To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA3D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
