Thanks, we will see what we can do. I looked at osgSim::Impostor and
osgSim::ImpostorSprite code. I think these classes are generally okay for
our purpose. We will try to derive our cloud impostor classes from them but
maybe modify computation Impostor error and valididty checking and use
bounding box instead of bounding sphere to minimize texture size. Our cloud
groups will be generally much wider than tall.
Thanks again,
Wojtek
----- Original Message -----
From: "Robert Osfield" <[EMAIL PROTECTED]>
To: "osg users" <[email protected]>
Sent: Monday, November 13, 2006 12:57 PM
Subject: Re: [osg-users] Quad tree like hierarchy of impostors ? Is
itpossible ?
Hi Wojtek,
osgSim::Impostor supports nesting so it full supports quad tree
layout, or any other layout you can do with the scene graph.
Impostor have lots of problems in general though, and the
osgSim::Impostor adds a few of its own caveates. I wouldn't generally
recommend impostors, but so very specific purposes a custom impostor
implementation might work well. A cloud system might just be one such
example. I wouldn't reuse a the general purpose osgSim::Impostor
though.
Robert.
On 11/13/06, Wojciech Lewandowski <[EMAIL PROTECTED]> wrote:
Hi,
Like everybody at some point of Engine development we are thinking about
implementing cloud system. We thought about 2D array of boxes each one
containing few cloud sprites. Of course displaying all this at onece
would
be too taxing for the rendereres so we would like to use impostors.
We thought that it would be nice if we could group each neighbouring four
cloud boxes under one impostor and each four neighbouring impostor groups
under parent impostor and so on building impostor quad tree hierarchy.
We attempted to modify osgimpostor example to do this but results are
discouraging either no dispaly or very bad framerate. Is it possible ? If
so
how ? Was impostor class developed taking into consideration that its
childrem may be another impostor ? Will they properly depth sorting
during
impostor generation ?
Regards,
Wojtek Lewandowski
_______________________________________________
osg-users mailing list
[email protected]
http://openscenegraph.net/mailman/listinfo/osg-users
http://www.openscenegraph.org/
_______________________________________________
osg-users mailing list
[email protected]
http://openscenegraph.net/mailman/listinfo/osg-users
http://www.openscenegraph.org/
_______________________________________________
osg-users mailing list
[email protected]
http://openscenegraph.net/mailman/listinfo/osg-users
http://www.openscenegraph.org/
