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Ivancevic_Applied-Diff-Geom

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226 <strong>Applied</strong> <strong>Diff</strong>erential <strong>Geom</strong>etry: A Modern IntroductionFig. 3.7 A medium–resolution, whole–body biodynamical manifold, with just a singleSE(3)−joint representing the spinal movability.Fig. 3.8 The high–resolution human spine manifold is a dynamical chain consisting of25 constrained SE(3)−joints.natural controls in the sense of geodesics on SE(3). However, both of itssubgroups, SO(3) and R 3 , are compact with quadratic metric forms definedby standard line element g ij dq i dq j , and therefore admit optimal muscular–like controls in the sense of geodesics (see section 3.10.1.2 below).

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