The process we have described in Section 4 is capable of generating
graded structures, with a spatially varying Young’s
modulus. We exploit this property to generate objects with
controlled elastic properties. The user inputs the spatially
varying Young’s modulus as a scalar field in space, which
we denote E(x), with x a point in space. Our technique
does not put any requirement on how the field is encoded
(e.g. implicit function or interpolated from a grid), but it
is expected that the field varies smoothly compared to the
size of the Voronoi cells. Violating this expectation will not
result in an incorrect structure, but the produced elasticity
gradient will not be a good match to the input field.