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3D Cellular Automata

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Rule Format B<births>/S<survivals>/<states>/<M|N> over the alive neighbour count, e.g. B5-7/S6/2/M.

B — counts that turn a dead cell alive (birth).
S — counts that keep an alive cell alive; else it dies.
states — total (default 2). >2 adds dying "trail" states that fade over several ticks.
M|N — Moore (26 neighbours) or von Neumann (6 faces).

Ranges/lists: 5-7, 1,3,5, 4,6-8.

Grid shape

Auto-rotate Isometric Borders

Auto-reseed when stale Every ~1s the current generation is read back and checked. If it's empty or hasn't changed for a few samples (dead or stuck — moving patterns still count as alive), it reseeds at the current density. Off for grids above 128³ (readback too heavy). Randomizer mode When the sim goes stale (and Auto-reseed is on), pick a random preset rule and a random grid shape, then reseed — an endless self-driving tour. Use 🔀 to jump now. Speed: 12/s Density: 0.35 Density = fraction of cells seeded alive at the start (0.20 ≈ 20% of the grid). It only sets the random starting fill — releasing the slider or 🎲 Reseed re-fills the grid; the rule drives it from there. Too sparse fizzles out, too dense saturates then collapses. Seed region: 25% Confines the random starting fill to a central block of this fraction of the grid, then the rule grows it outward into the empty space — the Softology/Visions-of-Chaos look. Full seeds the whole grid (the old behaviour). Smaller blocks make cleaner growing structures; very small ones can fizzle. Single seed (fractal) Starts from one live cell at the grid centre. Combined with an additive rule that births on exactly one neighbour (B1/S…), this grows a self-similar Sierpinski solid; many states leave the layered decay trail. See the Fractal — presets. Grid: 64³

Alive Trail Background

Cycle colors

0 fps · gen 0 · B4-6/S5-7/12/M · 64³