/** Zoom current view by specified factor (negative value means unzoom) */
public void zoomView(vtkCamera c, vtkRenderer r, double factor) {
lock();
try {
if (c.GetParallelProjection() == 1) c.SetParallelScale(c.GetParallelScale() / factor);
else {
c.Dolly(factor);
r.ResetCameraClippingRange();
}
} finally {
unlock();
}
}
