 This research proposes a new method for creating a 3D invisibility cloak that uses homogeneous and isotropic materials. It is able to conceal a large-scale spherical object from three different angles simultaneously. This is accomplished through a 3D polyhedral transformation and spatially invariant refractive index discretization, which reduces the coupling of the electromagnetic components of visible light. This makes it possible to create a large-scale invisibility cloak without requiring complex materials. This article was authored by Bin Zhang, Rong Rongzhu, Li Chaojing, and others.