[sldev] Body motion and facial expression tracking, Microsoft did it

[Ron Blechner]

Question:

Why are handshakes so important that they are much more of a topic of
discussion of implementation, against facial expressions?

-Ron / Hiro

On Fri, Jun 5, 2009 at 7:34 AM, Argent
Stonecutter<secret.argent at gmail.com> wrote:
> On 2009-06-04, at 08:55, Jan Ciger wrote:
>> Argent, read my comment to Tigro's mail. It wouldn't work. At least
>> not
>> in a nice way. For reaching and grasping you need much more IK than
>> just
>> the three arm joints and then you are hitting a severely
>> under-constrained and computationally expensive problem.
>
> That's why you don't try and solve it computationally. You don't
> replace normal animation, you use this for minor adjustments to the
> existing animation, and you limit the strength of the adjustment to
> small angles and specific joints.
>
> So it's down to the person selecting the base animation and providing
> the strength and possibly range (either distance or angle).
>
>> E.g. in one case I have seen the solver to keep the hands next to the
>> avatar's waist but stick the waist forward to reach a goal.
>
> Wouldn't happen, unless the person selected the waist as the joint
> that would move, and unless the waist was already close to the goal.
>
>> IK is a nice tool, but extremely hard to use unless you have an
>> animator
>> guiding it.
>
> Which is the point.
>
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-- 
Ron Blechner
Chief Technology Officer
Involve, Inc
www.involve3d.com