void ViewpointNode::getFrame(float frame[3][3])
{
SFRotation *orientation = getOrientationField();
// local x frame
frame[0][0] = 1.0f;
frame[0][1] = 0.0f;
frame[0][2] = 0.0f;
orientation->multi(frame[0]);
// local 0 frame
frame[1][0] = 0.0f;
frame[1][1] = 1.0f;
frame[1][2] = 0.0f;
orientation->multi(frame[1]);
// local 0 frame
frame[2][0] = 0.0f;
frame[2][1] = 0.0f;
frame[2][2] = 1.0f;
orientation->multi(frame[2]);
}
