[osg-ephemeris] setSkyDomeCenter() confusion

[Don Burns]

http://andesengineering.com/Projects/OsgEphemeris/

Under "osgEpehemris Doxygen Reference Pages"->EphemerisModel

ephemerisModel->setMoveWithEyePoint(true);  // or false

Also, if using the .osg file directives:

osgEphemerisModel::EphemerisModel {
        ...
        MoveWithEyePoint true
       ...
    }


-don



On Tue, Apr 28, 2009 at 8:26 AM, Terry Welsh <mogumbo at gmail.com> wrote:

>
> http://www.mail-archive.com/osg-users@lists.openscenegraph.org/msg26279.html
> Looks like someone else is having trouble with
> EphemerisModel::setSkyDomeCenter().  Can someone shed some light on
> this problem?
> --
> Terry Welsh  /  mogumbo 'at' gmail.com
> www.reallyslick.com  /  www.mogumbo.com
>
>
>
> On Thu, Nov 13, 2008 at 3:38 PM, Terry Welsh <mogumbo at gmail.com> wrote:
> > I'm trying to debug a coworker's app here.  After flying a couple
> > kilometers in his simulation I start to see the sky getting clipped
> > behind me as if the sky dome is not moving.  He is using
> > EphemerisModel::setSkyDomeCenter() every frame as it appears he is
> > supposed to according to the instructions in EphemerisModel.h
> > (although, I don't entirely understand what these instructions mean):
> >
> > "...Note that this should be used even when setMoveWithEyePoint() is
> > set to true because of datbase size initialization regardless of
> > run-time updates."
> >
> > So I dug into the code in the MoveWithEyePointTransform class, which
> > is supposed to move the sky around with your eyepoint.  This line:
> >
> > matrix.preMult(osg::Matrix::translate(osg::Vec3(
> > eyePointLocal.x(),eyePointLocal.y(),0.0f) - _center));
> >
> > should cause the movement of the sky, but as long as you're setting
> > the center with setSkyDomeCenter() the x and y values of eyePointLocal
> > and _center come out to be the same thing.  So the sky doesn't really
> > get moved around at all.
> >
> > I commented out the setSkyDomeCenter() in my coworker's app so that
> > _center would be (0,0,0) and now the sky dome doesn't get clipped.  So
> > are the instructions misleading us?  Or am I still doing something
> > wrong and just getting lucky?
> > --
> > Terry Welsh  /  mogumbo 'at' gmail.com
> > www.reallyslick.com  /  www.mogumbo.com
> >
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