[Robotics] IK Chain Joints ?

[Roger Wickes]

it has been awhile since I played with the pose matrix, but if it is as you say, then perhaps you can just subtract the parent's matrix from the child's, to get the net pose differential. 

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From: Florian Lier <blender at icram.de>
To: Blender and Robotics <robotics at blender.org>
Sent: Monday, July 13, 2009 4:03:13 PM
Subject: [Robotics] IK Chain Joints ?

Hello
everybody,

I need some help concerning an IK Chain and "hinge" Joints.
I've moddeled a robot arm which has an ik solver at its ik-chain top.
The bones are limited (XYZ) to the appropriate DoF of the joints.
I can get the poseMatrix of each bone, no problem so far...BUT
the poseMatrix of each bone is a summation of its parents and the bone
LOC/ROT/SIZE of itself.
What I need is the angle (Quat/Matrix .. whatever) between one bone of
the chain
and its direct parent (like "real" joints which have one DoF). I
couldn't figure out how to compute
this correlation. Is there any approach?

If you need an impresion of the arm have a look at this: http://vimeo.com/5503690

I've also tried the localMatrix...

THANK YOU...

Florian


      
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