Excuse my language but this took me fucking ages to figure out.
Create a Cloth.
run the sim.
cache the sim.
then under nCache menu choose "Transfer cache to input mesh"
that sets the Ncloth input mesh to the deformed ncloth shape.
then all you need to do is nCloth > remove nCloth
and that automaticaly turns your ncloth into a polly mesh.
if you need to check that the input mesh has been updated you can view it prior to removing your nCloth sim by choosing nCloth > display input mesh
phew..
Create a Cloth.
run the sim.
cache the sim.
then under nCache menu choose "Transfer cache to input mesh"
that sets the Ncloth input mesh to the deformed ncloth shape.
then all you need to do is nCloth > remove nCloth
and that automaticaly turns your ncloth into a polly mesh.
if you need to check that the input mesh has been updated you can view it prior to removing your nCloth sim by choosing nCloth > display input mesh
phew..