On 2/9/07, Dirk Reiners <[EMAIL PROTECTED]> wrote:
Hi Dan,
Daniel E. Shipton wrote:
> Is there a thorough verbose list somewhere of when commitChanges must be
> called for OpenSG2?
> I know about http://opensg.vrsource.org/trac/wiki/Dev/Changes1To2
> <http://opensg.vrsource.org/trac/wiki/Dev/Changes1To2> but it is not
> very verbose.
> I am looking for something like:
>
> OSG::commitChanges() must be called after/before:
> setX
> getY
> doZ
> ....
> ....
There is no hard and simple list (and it would be a significant pain to
keep
up-to-date if there was).
In most cases you're fine just calling commitChanges() once per frame
before
rendering (which is done automatically). However, to be safe you should
call
commitChanges after a bunch of sets before the next get.
The reason is that some derived values are updated in ::changed()
processing,
which is triggered by commitChanges(). As long as you're not accessing any
of
those you don't have to call commitChanges(). But it's hard to predict
which
ones are affected.
My rule of thumb for apps: call it after you've set up everything you need
to
set up. That way you don't have to worry about calling it before gets. For
libs:
call it when you return to the app after setting things up. An empty
commitChanges is fairly cheap, so I'd rather call it more often than
necessary
than forgot one and hunt magic bugs.
Sprinkling magic commitChanges() isn't really a viable solution when porting
code to 2.0.
It may be a pain to keep a list of when it must be called but it is quite
neccesary. While it is
very nice to see the begin/edits go away, I would like to see more details
of why/how/what changes
are being made to 2.0 and how that could affect code that is being ported.
-Dan
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