[osg-users] Shadow frustum culling

[Gedalia Pasternak]

Thanks Terry, yes that’s my exact problem, I have a cascaded shadow map
system for a directional light, where objects just outside the shadow map
frustra don’t alway cast into the shadow map. I’ll take a look at the view
class.
Gedalia

On Mon, Oct 29, 2018 at 5:06 PM Terry Welsh <mogumbo at gmail.com> wrote:

> Gedalia,
> If I understand the original question correctly, you're not seeing
> shadows that are cast by off-screen objects. I had that exact problem
> back around 2006 and Robert solved it with the introduction of the
> View class. Sorry, I don't remember the details beyond that and can't
> find our old discussion archived anywhere.
> - Terry
>
> > Hi Gadalia,
> >
> > The OSG doesn't culling per Camera with each camera's own view frustum
> used
> > for culling, this means the shadow camera should only cull things that
> are
> > in it's frustum.  If it's culling objects that you think should be in the
> > frustum then perhaps it's just set up with the wrong projection matrix
> > settings.
> >
> > Robert
> >
> > On Mon, 29 Oct 2018 at 18:44, Gedalia Pasternak <gpasternak at mak.com>
> wrote:
> >
> > >
> > > Hi List,
> > > I've noticed that when using a camera for shadow casting it can often
> cull
> > > out objects that are just outside of the frustum but cast shadows into
> the
> > > scene. Is there any way to decouple the camera frustum culling
> calculation
> > > from the rendering one, even just increasing the culling frustum size
> by
> > > 10-15% might help.
> > > Thanks
> > > -Gedalia
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