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

[Tateru Nino]

Maybe it isn't really about handshakes, and more about general 
lining-up-of-body-parts between avatars? :)

However, for most people in first-world western cultures, a handshake is 
the frequently sole form of socially allowable physical contact between 
two people who aren't intimates at some level. That makes it strongly 
symbolic.

For handshake you can substitute a few variations: Knuckle-bumps, 
high-fives and such, but they're all basically a handshake with 
different emotional flavoring.

Ron Blechner wrote:
> 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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>>      
>
>
>
>    

-- 
Tateru Nino
http://dwellonit.taterunino.net/

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