Re: [osg-users] (no subject)

Ivan Bolčina Thu, 02 Nov 2006 05:48:05 -0800

Hmmm, there seems to be ClipNode. Can I clip my node with it?

2006/11/2, Ivan Bolčina <[EMAIL PROTECTED]>:

Yes, but I have a set of stars. When I move through them, the effect is like hyperspace. However, I don't want to render stars to far away. If I do LOD node, the whole set of stars (4096) will be either drawn or not, LOD won't decide for each individual star if it is to be rendered or not.

So algoritm that I am looking for is somethnig like this:

before rendereing 4096:

for each point

    if it is too far away then don't include in drawing else include in drawing

render those points that are near

How can I make LOD to process individual points?

Or can I do something per pixel rendering? I wouldnt like to go into shading thing for this, but if it is the only option...

Thank you again for help.

2006/11/2, Robert Osfield <[EMAIL PROTECTED]>:

Hi Ivan,

Far clipping and culling are two seperate things.  Culling is done on
the CPU during the OSG's cull traversal, culling objects about the
view frustum, or against distance metrics.  Far clipping is down by
the GPU and is purely controlled by the projection matrix's far plane
position.

I suspect what you are after is simply the osg::LOD node - this allows
you to control the distance ranges that different subgraphs can be
seen at.

Robert.

On 11/2/06, Ivan Bolčina < [EMAIL PROTECTED]> wrote:
> Thanks Robert,
>
> the problem is getting clearer. However, what I would like to do. For my
> geometry node I would like to enable far clipping mode with distance of
> 10000. Everything else is ok. If it is not possible to enable per-node then,
> I would enable it for all scene. How to do it?
>
>
> 2006/11/1, Robert Osfield < [EMAIL PROTECTED]>:
> > Hi Ivan,
> >
> > The OSG has small feature culling on by default.  You can control the
> > pixel size that things get culled out vis osg::CullSettings, or just
> > switch off small feature culling completely using the same object.
> > You'll find more info on the FAQ.
> >
> > Robert.
> >
> > On 11/1/06, Ivan Bolčina < [EMAIL PROTECTED] > wrote:
> > > Hi.
> > >
> > > I would like to know "how far away" do objects get drawn. I would like
> for
> > > my geomety which contains
> > > primitive set of points
> > > (osg::DrawElementsUShort(GL_POINTS.... ) pixels won't
> get
> > > drawn if they are 10000 units away.
> > >
> > > thanks
> > >
> > >
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Re: [osg-users] (no subject)

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