Well, I can't say anything about detach and remove, but I can say something about compile and live.
Live means that the renderer is running. If you don't want your scenegraph to be live while you change it (so that you don't have to set innumerable capability bits and still get errors), just have two branchgroups at the very top of your scenegraph: one at the root, and one directly under the root. Attach everything else to the bottom one.
Then the only operation you do while the scengraph is live is remove the bottom one from the top one, and then the bottom one is no longer live (and your canvas will go black), so you can add, remove and change anything you want without problems. When everything is done, reattach the bottom bg to the top, and your scene will reappear in the new format.
If you don't do this, then you can only change things in your scenegraph if you set all the necessary capability bits before the scenegraph becomes live. This is because the renderer has to be notified that something it's drawing might change, I guess. You also won't be able to add or remove anything (such as shapes, transformgroups, etc) while it is live unless everything you add or remove has a branchgroup directly above it in the scenegraph, and you add or remove those branchgroups only. Otherwise you'll get "Only a branchgroup can be removed/added" errors.
Compile means that you've asked Java3d to streamline your scenegraph into something that's faster to render. For instance, a chain of transformgroups will be combined into one transformgroup that does everything at once. But once a scenegraph has been compiled, the scenegraph as you originally coded it no longer exists, so you can't change it. If you're intending to change something, you have to set the capability bits for it before you call compile, so that the compiler leaves that part available for changes. If you're intending to make lots of different changes over the lifetime of your scenegraph, compiling may not be a good idea at all.
A scenegraph (or a subtree of a scenegraph which is also a scenegraph) may be live or compiled or both or neither. Once it's compiled it can't be uncompiled.
Hope that helps.
Monica
tony Lincoln wrote:
Dear friends, What is the difference between detach and remove? The relationship between compile() and live? thanks a lot tony.
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