i := interface.node.state(n)

Return the interface model state indicator for interface node n.

The various state flags are encoded as bits in the returned state indicator. The integer values corresponding to flags are:
32 = In Contact 128 = Shear Fail Past 256 = Shear Fail Now 512 = Tension Failure 1024 = Shear Bond Failure

Individual bits in the integer can be tested using the intrinsic math.and.

Returns::int`i` - interface node state value
Arguments:n - interface node pointer