Gradient Constant on each facet. fi Xi Different in different facets ·the signal is Co Xk No definition on vertices. xj If the signal is the positions of the vertices, what does the gradient mean?Gradient • Constant on each facet. • Different in different facets • the signal is 𝐶 0 • No definition on vertices. • If the signal is the positions of the vertices, what does the gradient mean? 𝑓𝑖 𝑓𝑗 𝑓𝑘 𝒙𝑗 𝒙𝑘 𝒙𝑖 𝒙