I haven't looked at how DescriptionList is used in other parts of OSG,
but my thought was to use it with a key prefix, so the record type and
other metadata would be stored like "OpenFlight_Record=Geometry" or
"OpenFlight_Record=Road" or "OpenFlight_isTerrain=True". To avoid the
problem you describe, the OpenFlight exporter will need to be aware of
the DescriptionList entries produced by the importer.
More generally, is there a particular reason for DescriptionList to be
an array of strings and not an associative array, like pair<string,
string> (or even a map, but that is a slightly heavier data structure)?
As I mentioned I need to store custom attributes alongside scene graph
nodes and presently I am using UserData for this -- which is actually
rather problematic because UserData is not saved to the .ive file.
Right now I merge the custom attributes from a separate XML file, but I
frequently have problems getting the external attributes file and scene
graph to line up (various things like to add container nodes at the top
of the scene graph, so the attributes file will be off by a node or two).
Thanks,
- Peter
Paul Martz wrote:
I just realized... One issue with DescriptionList is that the OpenFlight
plugin uses it for Comment record data. This is really only a problem if you
load a FLT file, store the record type in the DescriptionList, and then
export it back out. Your record type data would then be exported as comment
records, which is probably not what you want.
I don't really see this as a showstopper issue though. Go for it.
Paul Martz
Skew Matrix Software LLC
http://www.skew-matrix.com
+1 303 859 9466
-----Original Message-----
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Peter
Amstutz
Sent: Friday, April 24, 2009 11:38 AM
To: OpenSceneGraph Users
Subject: Re: [osg-users] determine record type from OpenFlight files?
Hmm, I never noticed the "DescriptionList" feature before -- I presume
DescriptionList gets saved to and loaded from .osg and .ive files? That
would simplify some other work I did to add custom attributes to nodes
(which I acomplished using UserData, but it is a bit more complicated).
I will take a look at the OpenFlight importer.
Thanks,
Peter
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