[osg-users] RenderingHint and CompositeViewer

[Argentieri, John-P63223]

Just looking around for an alternative, it looks like I'd have to set an
UpdateCallback on all of the nodes, that contains a map from the
osgViewer::View's Scene's UpdateVisitor to the states of the nodes in
that Scene. I think this will work because the update traversal occurs
before the cull traversal, and the cull traversal is the one that
generates bins, no? I can check the NodeVisitor, if it is a
UpdateVisitor of one of the scenes, then I apply those states to the
node from the map. If I set a rendering hint to transparent at this
time, then the rendering traversal should respect my setting, right?
 
If this will work, I'll consider using osgViewer::CompositeViewer here.
Can anyone confirm?
 
John Argentieri 
Software Engineer 
GENERAL DYNAMICS 
C4 Systems 
(407) 281-5568 
John.Argentieri at gdc4s.com 

"This email message is for the sole use of the intended recipient(s) and
may contain GDC4S confidential or privileged information. Any
unauthorized review, use, disclosure or distribution is prohibited. If
you are not an intended recipient, please contact the sender by reply
email and destroy all copies of the original message."

 
________________________________

From: osg-users-bounces at lists.openscenegraph.org
[mailto:osg-users-bounces at lists.openscenegraph.org] On Behalf Of
Argentieri, John-P63223
Sent: Wednesday, April 09, 2008 4:14 PM
To: osg-users at openscenegraph.org
Subject: [osg-users] RenderingHint and CompositeViewer



Robert, 

There's one thing that I haven't been able to do with CompositeViewer.
Previously, we had a predraw callback that occurred before the
sceneview's update(), cull(), draw() calls. In that callback, we set
some states on some objects, particularly if they are opaque/transparent
in that view. With CompositeViewer, I've used the Camera's
PreDrawCallback, but at that point it's too late to set the object's
renderinghint to transparent. Is there something else I can do to get
the effect that I want? The CompositeViewer is rendering all the views,
so how do I issue a callback at the time that I need to?

John 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.openscenegraph.org/pipermail/osg-users-openscenegraph.org/attachments/20080409/b8db5c63/attachment.html