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A SparseCMA optimizer (diagonal + sparse low-rank updates) evolves niche-friendly CA rules - visualize, simulate, export GIFs.","from_template","domains",[],"thumbnail",{"_116":117,"_118":119},"moderation_state","ok","url","https://project-screenshots.websim.com/019a66f8-d55c-73ba-860b-d25148d1e9aa","video","has_active_experiment","project_revision",{"_62":122,"_63":124,"_58":87,"_65":125,"_126":-5,"_89":-5,"_127":128,"_129":64,"_67":130,"_131":132,"_98":64,"_78":133,"_91":-5,"_94":134,"_137":53,"_138":139,"_140":-5,"_141":-5,"_142":143},"019aa2e1-c32e-734f-8dee-0cfc2536f660","2025-11-20T20:08:15.918Z","visited_at","parent_revision_version",68,"parent_revision_project_id",{"_62":20,"_63":69,"_70":71,"_65":72,"_73":74,"_75":-5,"_76":-5,"_77":53},"meta",{"_58":59},"2025-11-20T20:10:23.444Z",{"_135":136},"multiplayer_count",0,"draft","site_id","tRPUVUNbeVpatDfwy","chat_session_id","chat_session_run_index","current_screenshot_url","https://project-screenshots.websim.com/019aa2e3-945b-7725-abce-e460e8428227","site",{"_62":144,"_63":139,"_89":146,"_65":147,"_148":149,"_150":151,"_152":153,"_80":81,"_166":167,"_168":169,"_118":-5,"_174":175,"_176":177,"_91":-5,"_178":179,"_180":-5},"7LiPqrKB8huP2UiGu","2025-11-20T20:09:33.978Z","state","done","model","gpt-5-mini","lore",{"_58":154,"_155":156,"_157":53,"_158":93,"_159":53,"_160":53,"_161":93,"_162":53,"_163":53,"_164":53,"_165":53},1,"attachments",[],"enableMultiplayer_v2","enableMobilePrompt","enableLLM2","enableComments","enableVideo","enableApi","enableTweaks","enableDB","enableDB_v2_1","owner",{"_62":20,"_63":69,"_70":71,"_65":72,"_73":74,"_75":-5,"_76":-5,"_77":53},"prompt",{"_170":171,"_172":173},"type","plaintext","text","we get into a lot of locked states where every other frame is just the inversion of the filled and unfilled pixels over and over the seem to be ther upper bounds munima that we keep getting stuck in","link_url","/p/c4xjfawxha9h0aexqipf","versioned_link_url","/p/c4xjfawxha9h0aexqipf/69","yapping","**Proposing code changes**\n\nI need to suggest changes to the code to address oscillation issues. One approach is to add small inertia in the stepGrid by applying majority smoothing or preventing exact inversions with some refractory damping. I could track the previous state and only allow changes if they persist. A potential solution is to introduce a 'prev' array to help detect immediate flips and require at least a two-step persistence before any changes are made. This should help prevent oscillation.\n**Updating code for prev array**\n\nI'm planning to modify the `makeGrid` function to include a `prev` array. I’ll need to tweak `randomizeGrid` to initialize this new array and update the `stepGrid` to utilize it properly. I’ll focus on making edits solely in `game.js`. Once I have the changes ready, I’ll output the file path and provide a code block with the edits, clearly marking it with `// ... existing code ...` to show where the updates fit in. Then, I’ll include a brief summary of what's been changed.\n\nChange: Add a 1-step hysteresis to the CA by tracking each cell's previous state and preventing immediate flip‑back (this blocks many 2-frame inversion oscillators).\n\ngame.js\n\n```game.js\n```\n\n```\n// ...existing code...\nexport function randomizeGrid(g,fill=0.25){\n for(let i=0;i= 0.5) localBirthSet.add(i);\n if(sigmoid(sv) >= 0.5) localSurviveSet.add(i);\n }\n\n // compute neighbor weighted sum using fractional sampling in a small radius\n let nw = 0;\n // flow params and projection vector (for anisotropy)\n const localFlowStrength = Math.max(0, Math.min(1, (rule.flowStrength ?? 0) + localMod * 0.35));\n const localAngle = (rule.flowAngle ?? 0) + localMod * 0.35;\n const fx = Math.cos(localAngle), fy = Math.sin(localAngle);\n\n // neighbor accumulation: sample a small disk around the cell with distance weighting\n // center at (x,y) expressed in grid coords; sample offsets in [-radius .. radius]\n for(let oy = -radius; oy <= radius; oy++){\n for(let ox = -radius; ox <= radius; ox++){\n if(ox === 0 && oy === 0) continue;\n const dx = ox, dy = oy;\n const dist = Math.sqrt(dx*dx + dy*dy);\n if(dist > radius + 0.001) continue; // keep to disk\n // continuous sample position (centered), add fractional offset to sample between cells\n const sampleX = x + dx;\n const sampleY = y + dy;\n // fractional occupancy via bilinear interpolation (allows sub-cell influence)\n const occ = sampleBilinear(g.a, sampleX, sampleY); // 0..1\n if(!occ) continue;\n // base isotropic weight inversely related to distance (Gaussian-like)\n const sigma = 0.9; // tune for falloff (smaller => more local)\n const distFactor = Math.exp(-Math.max(0, (dist - 0.9)) * (dist - 0.9) / (2 * sigma * sigma));\n // directional projection for anisotropy (aligns with flow)\n const proj = (dx*fx + dy*fy) / Math.sqrt(dx*dx + dy*dy || 1);\n const projBoost = Math.max(0, proj);\n // resonant/respective base weight from rule.weights if present (approx by mapping integer neighbor distance to index)\n // find nearest 8-direction index if possible (fallback to 1.0)\n let baseW = 1.0;\n if(rule.weights && rule.weights.length === 8){\n // map octants: compute angle and pick closest sector\n const ang = Math.atan2(dy, dx);\n const sector = Math.round(((ang + Math.PI) / (twoPI)) * 8) % 8;\n baseW = rule.weights[Math.abs(sector) % 8] || 1.0;\n }\n // combine factors: occupancy fraction * baseW * distance attenuation * directional boost\n const contrib = occ * baseW * distFactor * (1 + localFlowStrength * projBoost * 0.9) * (1 + localMod * 0.05);\n nw += contrib;\n }\n }\n\n // map weighted sum to an integer neighbor count for membership tests, but allow fractional influence by rounding\n const n = Math.round(nw);\n\n // HYSTERESIS: use one-step history (g.prev) to avoid immediate flip-back oscillations.\n // If this cell would flip to a state equal to its previous (two-steps-ago) state, prefer keeping current state.\n const cur = g.a[idx] ? 1 : 0;\n const prevVal = (g.prev && g.prev[idx]) ? 1 : 0;\n let candidate;\n if(cur){\n candidate = localSurviveSet.has(n)?1:0;\n } else {\n candidate = localBirthSet.has(n)?1:0;\n }\n\n // If candidate equals prevVal (i.e., this would flip back to what it was 2 steps ago),\n // and candidate differs from cur, then suppress the flip (keep cur) to break 2-step oscillators.\n if(candidate !== cur && candidate === prevVal){\n next[idx] = cur;\n } else {\n next[idx] = candidate;\n }\n\n if(next[idx] === 0 && g.signal) sigBuf[idx] = Math.max(sigBuf[idx] || 0, 1.0);\n if(next[idx] === 1 && g.signal) sigBuf[idx] = Math.max(sigBuf[idx] || 0, 0);\n }\n }\n\n // shift current state into prev buffer for hysteresis and then set new state\n if(g.prev){\n g.prev.set(g.a);\n }\n g.a.set(next);\n // diffuse & decay signals: simple kernel average + decay to create propagation over distance/time\n if(g.signal && sigBuf){\n const decay = 0.72; // per-step retention\n const diffuseFactor = 0.18; // neighbor contribution weight\n for(let y=0;y