Hello Ignazio,
I must apply a changing to an osg::ShapeDrawable element,not a osg:Node.Is
possible apply an update call back to a Drawable?
Please see the OSG reference docs.
http://www.openscenegraph.org/documentation/OpenSceneGraphReferenceDocs/a00185.html#08ef7a88aa216afff5b072bf03ae6969
virtual void setUpdateCallback (UpdateCallback *ac)
Set the UpdateCallback which allows users to attach customize the
updating of an object during the update traversal.
I'm trying to apply the method the Allen axplain, but if you are a method to
change color by update call back,please explain your method..Thanks a lot.
It's really a matter of preference. Some people like inserting code into
the update loop like Allen explained, some prefer encapsulating the
behavior in callbacks and then letting the object update itself. I think
the code of the update callback would be shorter and easier to
understand, but I suspect this by experience and might be wrong.
Plus, in some cases you don't have control over the update loop, or
don't want to clutter it with code for all the objects you will have to
change... Making update callbacks makes things more local and more
self-contained.
As for changing the color of a ShapeDrawable, please look at the docs
for osg::ShapeDrawable, the examples, and the mailing list archives as
it's really a basic operation to do. Maybe do a search in the OSG
examples source code, looking for setColor?
Hope this helps,
J-S
--
______________________________________________________
Jean-Sebastien Guay jean-sebastien.g...@cm-labs.com
http://www.cm-labs.com/
http://whitestar02.webhop.org/
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