Algorithm behind paricle to mesh wrapper

Can you please let me know what algorithm goes behind to find the mesh from particle information? What algorithm goes behind the below code?

warper = MeshWarper()
warper.generateWarp(reference_mesh, median_particle)
mean_mesh = warper.buildMesh(median_particle)

It uses LibIGL’s biharmonic shape deformation:

Thank you so much for your reply.