Hi,
I went through all the discussions on north compass.
I have displayed the discussed code and the way I m making use of it for my
osgEarth. But it s not working in my case.I m not sure what is to be done.
osg::Matrixd calculatePositionMatrix( const osg::EllipsoidModel* ellipsoid,
const osg::Vec3d &newPosition, const osg::Vec3d &oldPosition)
{
osg::Matrixd localToWorld, worldToLocal;
ellipsoid->computeLocalToWorldTransformFromXYZ(
newPosition[0],newPosition[1],newPosition[2],localToWorld );
worldToLocal = Matrix::inverse( localToWorld );
osg::Vec3d newPosInNewPosLocalCoordSystem = osg::Vec3d( 0,0,0 ); // ==
newPosition * worldToLocal;
osg::Vec3d oldPosInNewPosLocalCoordSystem = oldPosition * worldToLocal;
osg::Vec3d moveInNewPosLocalCoordSystem = newPosInNewPosLocalCoordSystem -
oldPosInNewPosLocalCoordSystem;
double heading = atan2(
moveInNewPosLocalCoordSystem[1],moveInNewPosLocalCoordSystem[0] );
// usually pitch in local tangent space can be computed
// like this (radians):
//double pitch = atan2( moveInNewPosLocalCoordSystem[2], hypot(
moveInNewPosLocalCoordSystem[0],
//moveInNewPosLocalCoordSystem[1] ));
pitch = 0.0;
double roll = 0.0;
osg::Matrix turnRight90DegreesClockwise = osg::Matrix::rotate(
osg::DegreesToRadians( -90.0 ), osg::Vec3d( 0,0,1 ) );
osg::Matrix rotateToMatchLocalHeading = osg::Matrix::rotate( heading,
osg::Vec3d( 0,0,1 ) );
osg::Matrix rotateToMatchLocalPitch = osg::Matrix::rotate( pitch, osg::Vec3d(
1,0,0 ) );
osg::Matrix rotateToMatchLocalRoll = osg::Matrix::rotate( roll, osg::Vec3d(
0,1,0 ) );
// So the matrix would be like this:
osg::Matrixd matrix = turnRight90DegreesClockwise * rotateToMatchLocalRoll *
rotateToMatchLocalPitch * rotateToMatchLocalHeading * localToWorld;
return matrix;
}
.......
...
...
For every FRAME:
...
..
osg::Vec3d newpos=viewer.getCameraManipulator()->getViewPoint();
osg::Matrixd rot=calculatePositionMatrix(ellip_model, newpos, oldpos);
compassMT->preMult(rot);
oldpos=newpos;
.....
....
Thanks,
A. Akilan
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=32349#32349
_______________________________________________
osg-users mailing list
[email protected]
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
