POV-Ray : Newsgroups : povray.binaries.animations : Your legs: IK or FK?? (409kbbu) : Re: Your legs: IK or FK?? (409kbbu) Server Time
5 Nov 2024 03:17:40 EST (-0500)
  Re: Your legs: IK or FK?? (409kbbu)  
From: Lewis
Date: 20 Apr 2000 17:42:44
Message: <38FF8770.C764EAF@netvision.net.il>
I meant, how did you do the FK?

"Greg M. Johnson" wrote:
> 
> Thanks
> 
> 0. body:                      one big blob with arms & legs as rotating
> cylinders & spheres.
> 1. hip/knee/foot rotations:   linear splines set up to enable keyframing
> 2. foot staying in one place: vtransform of foot position
> 3. vertical position:         2500 trace calls from -y to positions on grid
>                                     between min_ & max_extent x & z
> 
> Yes, it's not the most beautiful thing, but it actually works like a real leg.
> We use "IK" because it's a neat math trick, but the body really works as FK,
> does'nt it?
> 
> Lewis wrote:
> 
> > Very impressive. I can see a lot of hard work went into this one - how
> > did you do it?
> > > OR ARE YOU LEGS FK?
> > > That is, is your hip structurally supported off the ground, while one
> > > foot basically stays put on the ground due to friction, while muscles
> > > rotate your thigh and shin bones about their joints, and the position of
> > > your hip is at the mercy of a complicated function of all these
> > > variables?  Is the position of your knee backsolved by the postion of
> > > foot and hip or  is it solved by the rotation of your hip alone?
> > >
> > > My legs, at least, are FK!  ;-)
> > >


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