Clay, Bruce wrote:
Some of these attributes can be defined programmatically and others
will require human assessment.
I have been able to find the number of vertices using OSG but I have
not found out how to count the polygons. Which number would be a
truer or better number to store in the database to reflect the load
the model will have on the simulation.
I'm not sure which would be better, but you might want to consider
number of triangles as well, as that's what will eventually be drawn
(polygons is somewhat nonspecific).
You should be able to get these numbers by iterating over the primitive
sets in each drawable. You'll have to count differently depending on
primitive type and primitive set type, but it's not that difficult
(there may already be a visitor in OSG that does this, I'm not sure).
I can get a list of the parts that make up a model which would be
useful for animations but that is so variable that I don’t see a good
way to store that information in a database other than as a
potentially very long string.
Yeah, that's a tough one to characterize. It really depends more on the
target application than what's in the model itself.
Are there any other things we can use OSG to extract from the
individual models that should be included (scale, smoothness etc)?
Overall size would be a good one. You could combine this with the
model's scale so you present overall size in meters and then list the
units and/or scale factor to indicate what units the model uses. This
is kind of how COLLADA's asset tag does it.
Also, the coordinate system would be useful to know. COLLADA restricts
it to telling you which axis is up, which is enough in most cases, but a
complete description would probably be appropriate here (Z up, X right,
Y forward; Y up, X right, Z backward; etc).
If there is an interest in such a database the list can be posted on
the OSG site for the community to use and update after the initial
creation.
Sounds like a good idea to me. Just curious, have you looked around to
see if anyone else has created something like this?
--"J"
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