Thanks Glenn. I will look at this. Wojtek
----- Original Message -----
From: Glenn Waldron
To: OpenSceneGraph Users
Sent: Monday, November 23, 2009 5:41 PM
Subject: Re: [osg-users] Refactoring DatabasePagerNeedToRemovestringflagging
technique
On Mon, Nov 23, 2009 at 11:10 AM, Robert Osfield <robert.osfi...@gmail.com>
wrote:
Hi Wojtek,
On Mon, Nov 23, 2009 at 2:34 PM, Wojciech Lewandowski
<lewandow...@ai.com.pl> wrote:
> But I would strongly defend merits of arguments in the post. You say we
did
> wrong, but whats you recommendation on mixing many intersections with
> rendering ? Its very common scenario. How should we tackle it, if
current
> approach is wrong ?
The right approach is a difficult one. Getting a paged scene graph to
work with intersections at highest resolutions and at the same time
manage things for rendering with requires just the appropriate LOD
child for the needs of visuals is awkward. I know often vis-sim apps
don't even try to mix the two, and have a separate process entirely
for dealing intersections as for doing the visuals. Some sims even
run the visuals and intersection testing on entirely different
machines. Other sims use entirely separate databases for intersection
testing and visuals. Then there are others that use a height field
for height above terrain testing...
Wojtek,
The "keep it separate" approach is what we use in osgEarth. The idea is to
fetch terrain tiles directly, based on your target sampling resolution, instead
of traversing the whole LOD hierarchy. Take a took at the ElevationManager
utility. Perhaps it can provide some inspiration:
http://wush.net/trac/osgearth/browser/trunk/src/osgEarthUtil/ElevationManager
Glenn
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