[Rock-dev] Representation of invalid positions vs. unknown uncertainty

[Sylvain Joyeux]

On 01/19/2012 09:48 AM, Jakob Schwendner wrote:
>> Which is the default value set by RigidBodyState::invalidate() and marks
>> the position as unknown (infinite uncertainty on the position).
> I would also think that the NaNs in the off-diagonal are misplaced if it
> wants to say infinite uncertainty. Should be 0 in my opinion.
That's something I meant to ask ...

What would

  Inf 0   0
  0   Inf 0
  0   0   Inf

actually mean (if it does mean something). What would be the difference 
with:

  Inf Inf Inf
  Inf Inf Inf
  Inf Inf Inf

Sylvain