Tetrahedron

julia> t = Tetrahedron(
           PVector(1.0, 0.0, 1.0),
           PVector(1.0, 1.0, 0.0),
           PVector(0.0, 1.0, 1.0),
           PVector(1.0, 1.0, 1.0)
       )Tetrahedron{Float64}(PVector{Float64}(1.0, 0.0, 1.0), PVector{Float64}(1.0, 1.0, 0.0), PVector{Float64}(0.0, 1.0, 1.0), PVector{Float64}(1.0, 1.0, 1.0))
julia> centroid(t)PVector{Float64}(0.75, 0.75, 0.75)
julia> circumcenter(t)PVector{Float64}(0.5, 0.5, 0.5)
julia> insphere(t, PVector(0.5, 0.5, 0.5))Interior()
julia> insphere(t, PVector())OnEdge()
julia> insphere(t, PVector(2.0, 0.0, 0.0))Exterior()
julia> PhysicalMeshes.volume(t)0.16666666666666666
julia> orientation(t)PositivelyOriented()