Hi Cary
That makes sense. And I understand it for switches and transforms.
Would I need to do deep_copy_nodes if it only contained geometry under
LODs?
I think the nodes make sense, since it is everything forming the
structure (i.e. without the geodes containing the drawables)
As for the arrays, we ran some tests and determined it better to
flatten transforms out and do that for positioning some objects and
then just put them under a single transform to move them around as a
group. It was on the order of 1000+ objects. I am going to modify that
code to allow me to switch methods so we can retest it.
*From:*[email protected]
[mailto:[email protected]] *On Behalf Of
*Sebastian Messerschmidt
*Sent:* Wednesday, April 16, 2014 9:43 AM
*To:* OpenSceneGraph Users
*Subject:* Re: [osg-users] Understanding Node Clone Options
Hi Cary,
I usually use
the combination DEEP_COPY_NODES | DEEP_COPY_CALLBACKS.
It works in my use case, where I need to instance dynamic objects
(such as cars) which need to keep their individual DoF, Switches and
Animations.
I intentionally left out the flatten-static transform optimizations,
but It might work if you visit your models transforms before
optimizing and tag them as Dynamic. As far as I remember, nodes tagged
DYNAMIC wont be touched by the Optimizer.
Regarding the vertices: With the options above the arrays will be
shared I guess, which is exactly what I want, since I only want to
duplicate the "structure" but not the geometry. If you clone the
arrays each instance will have its own geometry, which might have a
big impact on performance.
cheers
Sebastian
As our simulation runs we can add and remove models and many times
the same model repeatedly. We only load the physical model once
and then clone it for each instance we need. Each model can
contain matrix transforms, switches, LODs, and update callbacks
that all need to be unique. I am trying to limit how much we are
actually cloning now since we don't necessarily have all of these
things in every model. For example if we have a light pole that is
use 100 times, we don't even need to clone, we can just add the
child directly to the scene under different matrix transforms. The
problem is in understanding when I actually need to clone and what
type of options I need.
I know I need to use the DEEP_COPY_ARRAYS when I need the actual
vertices to be different, which does happen sometimes when I add a
matrix that gets flattened on to the model. However, for switches,
dynamic matrixTransforms, LODS, and callbacks, when do I use the
different options? So far I have only gotten everything to work
for those when I do a DEEP_COPY_NODES. Do I really need this, or
would some subset of other options work?
I guess my main question is when are each of the various
DEEP_COPY_ options needed?
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