Lattice structures with identifiable patterns

A method comprising:

• determining, by a processor, a first zone in a digital model of a lattice structure at which a predefined information-conveying pattern is to be formed within a portion of the lattice structure comprising an external surface of an object and is to remain visible at the external surface of the object when completely manufactured;
• determining, by the processor, a second zone in the digital model of the lattice structure corresponding to a location adjacent to the first zone;
• arranging, by the processor, a plurality of seeds at a first density level in the first zone;
• arranging, by the processor, a plurality of seeds at a second density level in the second zone;
• growing, by the processor, the plurality of seeds into cells having edges that contact edges of neighboring cells, wherein the cells in the first zone are arranged at a different density level than the cells in the second zone;
• forming, by the processor, the digital model of the lattice structure to include the predefined information-conveying pattern from the cells;
• controlling fabrication components of a three-dimensional fabrication system to fabricate the object, including the lattice structure with the predefined information-conveying pattern.

A physical object comprising:

• an external surface;
• a lattice structure comprising the external surface of the physical object;
• a first set of zones comprising a first lattice structure of the lattice structure, the first lattice structure formed of cells generated from seeds randomly arranged at a first density level, wherein the first set of zones correspond to information-conveying content that is visible at the external surface;
• and
• a second set of zones comprising a second lattice structure of the lattice structure, the second lattice structure formed of cells generated from seeds randomly arranged at a second density level, wherein the cells forming the first lattice structure are arranged at a different density level than the cells forming the second lattice structure.