bool
Horizon::getPlane(osg::Plane& out_plane) const
{
// calculate scaled distance from center to viewer:
if ( _valid == false || _VCmag2 == 0.0 )
return false;
double PCmag;
if ( _VCmag > 0.0 )
{
// eyepoint is above ellipsoid? Calculate scaled distance from center to horizon plane
PCmag = 1.0/_VCmag;
}
else
{
// eyepoint is below the ellipsoid? plane passes through the eyepoint.
PCmag = _VCmag;
}
osg::Vec3d pcWorld = osg::componentMultiply(_eyeUnit*PCmag, _scaleInv);
double dist = pcWorld.length();
// compute a new clip plane:
out_plane.set(_eyeUnit, -dist);
return true;
}
bool
Horizon::getPlane(osg::Plane& out_plane) const
{
// calculate scaled distance from center to viewer:
double magVC = _cv.length();
if ( magVC == 0.0 )
return false;
// calculate scaled distance from center to horizon plane:
double magPC = 1.0/magVC;
osg::Vec3d normal = _cv;
normal.normalize();
osg::Vec3d pcWorld = osg::componentMultiply(normal*magPC, _scaleInv);
double dist = pcWorld.length();
// compute a new clip plane:
out_plane.set(normal, -dist);
return true;
}