Above is one of the first images shown, it demonstrates using socks how different mammals have evolved with similar heel joint chains to humans but with vastly different positioning. I was completely unaware that horses for example had a heel placed half way up the hind leg but this brilliantly communicates the concept.
Another early point was the difference in the body shape and flexibility of carnivores and herbivores. A carnivore has a much shorter digestive tract than a herbivore due to meat being much quicker to breakdown and vegetation taking longer. A good example is that of a horse having a digestive tract 4 times the size of a strict meat eater. This difference in size allows a meat eater to be slim and lean giving considerably quicker and flexible movement. On the subject of horses thheir backbone is much like a rigid girder that maintains a stiff form at all times, this allows horses to be ridden and not phased by the weight of the rider. their centre of mass is at riding point also as shown in the diagram/sketch in my notes above.
A schoolboy error of character rigging and skeleton concept is bones being placed to close to the surface of the skin. bones are centred deep within the tissue. if bones are not correctly placed then joint rotation will be wrong. Another bone issue is the understanding of the leg. the foot always remains parallel to the knee due to the parallelogram system mid-leg. this can also be seen in arms and as shown above in bird's wings.
I am just over a third of the way through these notes so expect 2 more blogs on Dr Sumida. hope this is helpful for people interested in the whole rigging thing or simply for animation purposes.
The non copyright presentation materials are available in PDF form on stuart's site http://www.stuartsumida.com/
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