Periodic Spaces

One of my favorite SDF techniques is domain repetition: (def eye-center [35 82 62]) (def eyes (ball 39 | move eye-center | mirror x :r 10)) (def eye-angle [0 0 0]) (defn pupils [target] (def left-pupil (ball 15 | shade black | move [39 0 0] | align x target | move eye-center )) (def right-pupil (ball 15 | shade black | move [39 0 0] | align x target | move [-1 1 1 * eye-center] )) (union left-pupil right-pupil)) (defn get-target [seed i] (hash3 seed i | remap- + [0 0 2] | normalize)) (defn eye-target [seed] (def base (t + hash 30 seed * hash 20 seed)) (def frame (floor base + 100)) (mix (get-target seed frame) (get-target seed (frame + 1)) (ss (fract base) 0.49 0.51))) (def anim (osc t 7 | ss 0.2 0.8)) (union :r 50 (ball [100 150 100] | move [0 7 3]) | shade sky | union (expand eyes 20 | move [0 1 -43]) :r 10 | subtract :r 10 eyes | union (eyes | shade white | union-color (pupils (eye-target $i))) | union (box :r 17 [(ss p.y -44 44 17 33) 44 17] | morph (ball [29 44 17]) | rotate x…