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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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