Hi Mike,
I've had a problem with computeLocalToWorld when the resulting matrix is
converted to a quaternion. It also happened at angles divisable by 90deg.
The matrix to quat conversion has been fixed in CVS, so you might want
to give it a shot. I'm unsure if such a conversion happens in
NodeTrackerManipulator, but it might be worth a try.
rgds
jp
Mike Illuzzi wrote:
> I've found a strange issue when using the NodeTrackerManipulator and the
> node being tracked rolls inverted. When it hits 90 degrees the camera
> jumps from head-on perspective to tail perspective (or basically 180
> degrees off of whatever it was in). When the node rolls back the
> problem fixes itself.
>
>
>
> To reproduce the problem open up osgsimulation.cpp and replace the
> ModelPositionCallback::updateParameters function with this:
>
>
>
> void updateParameters()
>
> {
>
> _longitude += ((2.0*osg::PI)/360.0)/20.0;
>
> _rotation = _rotation * osg::Quat(.01, osg::Vec3(1.0, 0.0, 0.0)); //
> Add a roll
>
> }
>
>
>
> And make sure to run it with the tracker set to NODE_CENTER_AND_AZIM.
>
>
>
> I don't think the problem here is specific to the NodeTrackerManipulator
> -- I discovered it while working on a home-brewed manipulator. The
> numbers appear to be coming in this way from the matrix when
> computeLocalToWorld transform is called.
>
>
>
> Can anyone provide me any insight as to why this happens?
>
>
>
> Thanks
>
>
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>
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