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There are 6 degrees of freedom total... 3 axis of rotation and 3 degrees of
translation. For whatever type of skeletal system you have you can divide
it up by joint type, (e.g. the elbow bends one way but not the other, the
forearm might be a separate joint that twists only).... Or you can make
all joints fundamentally the same in terms of how many degrees of freedom
they support, but with different limits. For my stuff (still FK, I haven't
gotten around to IK) I've chosen the latter. Every bone has 3 degrees of
freedom - two bends plus twist. I opted not to bother with "sliding"
joints. For future flexibility I also decided to give the joint a very
small but non-zero reverse bend limit, so that if I really wanted to, I
could bend the fingers backwards.
Charles
"Rune" <new### [at] runevision com> wrote:
> stm31415 wrote:
> > Rune --- I had not seen that. It looks like a much more efficient
> > method for making a leg than what mine will be. The benefit of mine
> > is that it will do arbitrary limbs (arms, legs, robots, etc.), that
> > have axes in all 3 dimensions; at least it should. I'm about to give
> > him legs; I will post when I have results.
>
> I'm not sure what you mean by "that have axes in all 3 dimensions". The
> methods described on my page was used for the AL the Alien animations at
> http://runevision.com/3d/anims/#40 so it can be used for arbitrary
> two-segment limbs like arms and legs. It's not a general system that can be
> used for any hierarchy of bones though (like the inverse kinematics in
> professional animation systems are).
>
> Rune
> --
> http://runevision.com
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