Curve boundary condition in LMB

Hello All,
I am working on Curve B.C in lattice and I want to apply a solid -wall of cylinder(2D) with MLS method.
In fact, I am confused about how to calculate delta=(xf-xw)/(xf-xb) for each node.
My question is:
Is it necessary to define delta for each direction(each direction in which wall has intersection with lattice link, for each solid node)? If this is true, it will be very complicated for complex geometry.
Or, we need just one delta for each node? if this method is true, How can I define delta and fluid node? For instance, which node is nearest fluid node?
Are there any sources or codes that explain this method with simple way?