SDF, Signed Distance Fields or Signed Distance Functions are a relatively new approach to computer graphics. Described on Wikipedia as: Let Ω be a subset of a metric space X with metric d, and ∂Ω be its boundary. The distance between a point x of X and the subset ∂Ω of X is defined as usual asd(x,∂Ω)=infy∈∂Ωd(x,y), where inf denotes the infimum. The signed distance function from a point x of X to Ω is defined byf(x)={d(x,∂Ω)if x∈Ω−d(x,∂Ω)if x∉Ω. In much simpler terms,