Computing distance function

• Find Tp(xi) whose Oi is closest to p

z = p – ((p – Oi) * ni) * ni

if d(z,X) < (? + ?) then

f(p) = (p – Oi) * Ni

else

f(p) = undefined

- creates a Zero Set Z(f), piecewise linear, but

contains discontinuities

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