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    }
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    }
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    void QuatTrackBall::get_view_param(Vec3f& eye, Vec3f& _centre, Vec3f& up) const
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    void QuatTrackBall::get_view_param(Vec3f& eye, Vec3f& _centre, Vec3f& up) const
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    {
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    {
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	up  = qrot.apply_unit(Vec3f(0,1,0));
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	up  = qrot.apply_unit(Vec3f(0,1,0));
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	Vec3f right = qrot.apply(Vec3f(1,0,0));
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	Vec3f right = qrot.apply_unit(Vec3f(1,0,0));
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	_centre = centre - up * trans[1] - right * trans[0];
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	_centre = centre - up * trans[1] - right * trans[0];
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	eye = qrot.apply_unit(Vec3f(0,0,1)*eye_dist) + _centre;
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	eye = qrot.apply_unit(Vec3f(0,0,1)*eye_dist) + _centre;
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    }
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    }
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