Fig. 4: The mutations are applied to the genome created from random crossover in Fig. 3.
From: Computational design for 4D printing of topology optimized multi-material active composites
(a) two active material voxels replace a passive material and a void element, (b) two void elements replace an active and a passive material voxel, (c) a sequence shifting is applied and upon encountering a restriction, a different shift point is chosen.
