In an article that I'm reading there is a mention to this "thing" and I absolutely don't know anything about it, for me it could be anything.
I noticed that this thing is somehow related to the math behind 3D computer generated simulations ( cloths ? fluids ? ) and to a specific way of distributing a set of points onto a surface, ( maybe there are relations to the Poisson distribution ? ) .
Apparently this thing is generally useful non only for realtime graphics but for 3D imaging in general, anyone knows what this thing is a what is actually good for ?
Thanks.
See http://www.hindawi.com/journals/ijmms/2009/179481/. "AINV" means Approximate Inverse. To solve equations like $Ax=b$ where $A$ is a matrix of size $n$, a method is to find a matrix $M$ such that $MA$ is almost the identity (i.e. only a few coefficients differ from those of $I_n$), and so that computing $Mb$ is fast.