(RI) Marked Bone - what is the difference?

[beveraii]

Hi,

Please could you explain - and hopefully update the documentation - the difference between '(RI) Marked Bone' and the regular one?  I can't find any information about what this is.
It's used here - www.youtube.com/watch?v=Ypg3rMYTvvA 

thanks.

[Yeah YANG]

The (RI) means Reserve Information, it will record the contact information (contact orientation and intensity) automatically in an agent when the contact(collide) happen.
Then when we turn on dynamics with language (enable dynamics with force ??) it can apply a force using the orientation of reserved information and apply the force with any angle.
I didn't update the doc because it is very rare to use.

The more frequently be used feature is this one and the reserve information is automatically too.
www.youtube.com/watch?v=AHSijat98vY&feature=youtu.be

This is useful when we simulate some agents are hit but arrow or stone weapon, it makes the agent (parts) move toward the incoming to simulate the inertia force effect.

Cheers,
Yeah