[osg-users] blend vpb & osgGIS models

[Glenn Waldron]

Thanks Robert, that makes sense. There are still issues when using view
dependent mode though. My initial thought was to grid up the geometry to be
projected and then apply cluster culling to each cell, so that it would only
consider projecting "Visible" geometry. However the cluster-culling doesn't
seem to operate as I expected in this context, i.e., on the geometry to be
rendered to texture. Does an RTT camera consider cluster culling the same
way a normal camera does? Or am I barking upt he wrong tree? Thanks. -gw

On Jan 7, 2008 4:17 AM, Robert Osfield <robert.osfield at gmail.com> wrote:

> On Jan 7, 2008 4:12 AM, Glenn Waldron <gwaldron at gmail.com> wrote:
> > However, it only works for areas of limited geographic size. Overlaying
> a
> > geocentric model onto a geocentric globe using osgSim::OverlayNode
> doesn't
> > work for projecting models that cover larger areas or the entire earth.
> > Robert may be able to shed some light on why this is the case.
>
> The limitation comes down to use of projective texturing - it can't
> wrap around the globe.  The view dependent OverlayNode modes can cope
> better as they clamp the projected region to what is visible on
> screen.
>
> Robert,
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>



-- 
Glenn Waldron : Pelican Mapping : http://pelicanmapping.com : 703-652-4791
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