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    QuatTrackBall::QuatTrackBall(const Vec3f& _centre,
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    QuatTrackBall::QuatTrackBall(const Vec3f& _centre,
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			 float _eye_dist,
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			 float _eye_dist,
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			 unsigned _width,
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			 unsigned _width,
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			 unsigned _height):
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			 unsigned _height):
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	centre(_centre), eye_dist(_eye_dist), scale(0.5*_eye_dist),
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	centre(_centre), width(_width), height(_height),
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	width(_width), height(_height)
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	scale(0.5*_eye_dist), eye_dist(_eye_dist)
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	{
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	{
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	// This size should really be based on the distance from the center of
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	// This size should really be based on the distance from the center of
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	// rotation to the point on the object underneath the mouse.  That
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	// rotation to the point on the object underneath the mouse.  That
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	// point would then track the mouse as closely as possible.  This is a
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	// point would then track the mouse as closely as possible.  This is a
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	// simple example, though, so that is left as an exercise.
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	// simple example, though, so that is left as an exercise.