{ "genart": "1.2", "id": "standing-timber", "title": "Standing Timber", "created": "2026-09-10T00:00:00Z", "modified": "2026-09-10T22:01:51.122Z", "renderer": { "type": "canvas2d", "version": "1.x" }, "canvas": { "width": 1400, "height": 1000 }, "parameters": [], "colors": [], "dataChannels": [ { "name": "air1", "type": "vector", "cols": 400, "rows": 300 }, { "name": "air2", "type": "vector", "cols": 400, "rows": 300 }, { "name": "air3", "type": "vector", "cols": 400, "rows": 300 }, { "name": "air4", "type": "vector", "cols": 400, "rows": 300 }, { "name": "trunk1", "type": "vector", "cols": 400, "rows": 300 }, { "name": "trunk2", "type": "vector", "cols": 400, "rows": 300 }, { "name": "trunk3", "type": "vector", "cols": 400, "rows": 300 }, { "name": "trunk4", "type": "vector", "cols": 400, "rows": 300 }, { "name": "shadow", "type": "vector", "cols": 400, "rows": 300 } ], "state": { "seed": 7788, "params": {}, "colorPalette": [ "#2b1a12", "#5c3320", "#8a5a3c", "#c9a982", "#ece3d4" ] }, "algorithm": "// Standing Timber — field generation only. This code makes NO marks.\n// It publishes tone and direction maps on the ADR 062 data bridge; every line\n// in the picture is drawn by a plugin layer that reads them.\n//\n// A wood against a low sun. The sun is behind the trees, so\n// every trunk is a dark column with a thin lit edge on the side facing the\n// light, and every trunk throws its shadow straight toward the viewer. Those\n// shadows lie on the ground plane, so in the picture they are not parallel:\n// they radiate from the one point on the horizon under the sun, which is also\n// where the glow in the air is brightest. One light source sets the value of\n// everything, and its position is the whole composition.\n//\n// The same two rules as the rest of the series:\n// the direction of a hatch = the surface or grain it describes\n// the density of a hatch = how far that surface is turned from the light\nfunction sketch(ctx, state) {\n var W = state.canvas.width, H = state.canvas.height;\n var seed = state.seed || 0;\n\n ctx.fillStyle = state.colorPalette[4];\n ctx.fillRect(0, 0, W, H);\n\n // The field grid scales with the canvas so a cell stays the same size in\n // pixels. Holding it fixed softens every mask edge as the plate grows.\n var COLS = Math.round(200 * W / 700), ROWS = Math.round(150 * H / 500);\n // The plate is inset in the sheet (see the builder), and the field maps\n // onto the plate, so this is the plate's aspect, not the canvas's.\n var ASPECT = (W * 0.85) / (H * 0.81);\n\n function rngFrom(a) {\n return function () {\n a |= 0; a = a + 0x6D2B79F5 | 0;\n var t = Math.imul(a ^ a >>> 15, 1 | a);\n t = t + Math.imul(t ^ t >>> 7, 61 | t) ^ t;\n return ((t ^ t >>> 14) >>> 0) / 4294967296;\n };\n }\n var rand = rngFrom(seed * 2654435761 + 7919);\n\n /** A lattice of random values, bilinearly sampled over [0,1]. */\n function lattice(nx, ny) {\n var v = new Float32Array(nx * ny);\n for (var k = 0; k < nx * ny; k++) v[k] = rand() * 2 - 1;\n return function (u, t) {\n // 🔴 Clamp. A sample outside [0,1] returns undefined, becomes a NaN\n // direction in a published channel, and takes the whole render down on\n // a frame the CLI still exits 0 for. See wind-algorithm.js.\n if (u < 0) u = 0; else if (u > 1) u = 1;\n if (t < 0) t = 0; else if (t > 1) t = 1;\n var x = u * (nx - 1), y = t * (ny - 1);\n var x0 = Math.floor(x), y0 = Math.floor(y);\n var x1 = x0 + 1 > nx - 1 ? nx - 1 : x0 + 1, y1 = y0 + 1 > ny - 1 ? ny - 1 : y0 + 1;\n var fx = x - x0, fy = y - y0;\n fx = fx * fx * (3 - 2 * fx); fy = fy * fy * (3 - 2 * fy);\n var a = v[y0 * nx + x0], b = v[y0 * nx + x1], c = v[y1 * nx + x0], d = v[y1 * nx + x1];\n return (a + (b - a) * fx) * (1 - fy) + (c + (d - c) * fx) * fy;\n };\n }\n function smooth(e0, e1, x) {\n var t = (x - e0) / (e1 - e0);\n if (t < 0) t = 0; else if (t > 1) t = 1;\n return t * t * (3 - 2 * t);\n }\n\n var mist = lattice(11, 9); // the air is not evenly thick\n var kink = lattice(151, 113); // finer than the line spacing, so neighbours disagree\n var edge = lattice(53, 41); // breaks mask boundaries\n // Bark runs along the trunk, so its lattice is fine across and coarse along.\n var bark = lattice(211, 23);\n // One dither lattice per pass, each different, so the pass boundaries fray\n // independently instead of jogging together into one contour.\n var dith = [lattice(83, 63), lattice(79, 59), lattice(89, 67), lattice(73, 55)];\n\n // --- The ground and the light -----------------------------------------\n var hv = 0.57 + rand() * 0.08; // the horizon, below the middle: a wood is tall\n var vpU = 0.5; // the viewer looks straight in\n var XK = 1.4; // ground units visible across the near edge\n var DNEAR = 1.0;\n // The sun sits off centre, never in the middle and never at an edge. Its\n // point on the horizon is where every ground shadow converges.\n var sunU = rand() < 0.5 ? 0.26 + rand() * 0.16 : 0.58 + rand() * 0.16;\n var sunV = hv - 0.06 - rand() * 0.07;\n var sx = (sunU - vpU) * XK; // the sun's direction on the ground, per unit depth\n\n /** Screen v of a ground point at depth d. */\n function groundV(d) { return hv + (1 - hv) * DNEAR / d; }\n\n // --- The trees --------------------------------------------------------\n // Four ranks, nearest first. Each tree is placed across the view, then set\n // on the ground at its depth, so its base, its width and its shadow all come\n // out of one projection instead of being set by hand.\n //\n // 🔴 Fewer than looks right on paper. The first version stood 42 trees in\n // four evenly stratified ranks and read as a colonnade: a stage set of\n // pillars, not a wood. The back ranks are now thrown at random, so they\n // clump and leave gaps the way self-sown trees do, and they lean.\n var RANKS = [\n { n: 3, d0: 0.80, d1: 1.45, w0: 0.080, w1: 0.160, lean: 0.025, strat: true },\n { n: 5, d0: 1.80, d1: 3.20, w0: 0.070, w1: 0.120, lean: 0.045, strat: true },\n { n: 8, d0: 3.60, d1: 6.50, w0: 0.060, w1: 0.110, lean: 0.040, strat: false },\n { n: 13, d0: 7.00, d1: 15.0, w0: 0.060, w1: 0.100, lean: 0.035, strat: false },\n ];\n var trees = [];\n for (var ri = 0; ri < RANKS.length; ri++) {\n var R = RANKS[ri];\n var tries = 0;\n var slot = 1.14 / R.n;\n for (var s = 0; s < R.n && tries < 400; tries++) {\n var su = R.strat ? -0.07 + slot * (s + 0.15 + rand() * 0.7) : -0.07 + rand() * 1.14;\n var d = R.d0 + rand() * (R.d1 - R.d0);\n // The nearest rank carries the composition, so it is placed with care:\n // never over the sun, where a dark column would put out the light the\n // whole plate is organised around, and never evenly spaced.\n if (ri === 0) {\n if (Math.abs(su - sunU) < 0.13) continue;\n var clash = false;\n for (var q = 0; q < trees.length; q++) if (Math.abs(trees[q].u - su) < 0.2) clash = true;\n if (clash) continue;\n }\n var wt = R.w0 + rand() * (R.w1 - R.w0);\n trees.push({\n u: su, d: d, rank: ri,\n gx: (su - vpU) * d * XK,\n wt: wt,\n hw: wt / (d * XK) / 2, // half width on screen, in u\n vb: groundV(d), // where it stands\n lean: (rand() * 2 - 1) * R.lean, // du per unit of height\n sway: rand() * Math.PI * 2,\n });\n s++;\n }\n }\n trees.sort(function (a, b) { return a.d - b.d; });\n\n // Fray lattices for the ruled air, fine ACROSS the lines and coarse ALONG\n // them, so a pass boundary lands at a different point on every line and the\n // ruling ends raggedly, the way an engraver lets a sky thin out. The square\n // dither lattices cut it into stair-stepped blocks: pixel art, round a sun.\n // ⚠️ Allocated after the trees on purpose. Every lattice spends hundreds of\n // rand() calls, so one allocated above would re-cut every seed's wood.\n // 🔴 Fine along the lines too, at about a line's length. At 7 cells across,\n // a whole row took one jog, every line in it stopped at the same height, and\n // the top of the glow came out as a straight edge: a window, not a sun.\n var streak = [lattice(23, 211), lattice(19, 199), lattice(27, 223), lattice(21, 191)];\n\n /** Screen centre and half width of a tree at height v, or null below its foot. */\n function trunkAt(t, v) {\n if (v > t.vb) return null;\n var up = t.vb - v;\n // A trunk tapers only slightly over the height of a plate, but it\n // flares at the root, where it grips the ground. Without the flare a trunk\n // stands on the ground like a post pushed into it.\n var flare = 1 + 0.55 * Math.exp(-up / (5 * t.hw * ASPECT));\n var hw = t.hw * (1 - 0.14 * up) * flare;\n var cu = t.u + t.lean * up + 0.004 * Math.sin(up * 6.0 + t.sway) * (t.rank === 0 ? 1 : 0.4);\n return { cu: cu, hw: hw };\n }\n\n /** The air's own value: bright round the sun, closing in toward the canopy. */\n function airTone(u, v) {\n var dx = (u - sunU) * ASPECT, dy = (v - sunV) * 1.25;\n var rr = Math.sqrt(dx * dx + dy * dy);\n // 🔴 Kept small, and its edge is frayed by the pass dither below. Broad\n // and cut at one threshold, the glow came out as a hard-edged white disc\n // hung in the trees — a moon, not a low sun in mist.\n // Graded slowly outward rather than steeply: pulled in tight to kill the\n // disc, it left the whole plate at one murky middle value — night in a\n // wood, not a winter morning.\n var T = 0.02 + 0.40 * Math.pow(smooth(0.0, 1.1, rr), 0.9);\n // The canopy closes overhead, so the top of the plate is darker than the\n // glow's falloff alone would make it.\n T += 0.12 * smooth(0.35, 0.0, v);\n T += 0.04 * mist(u, v);\n return T;\n }\n\n var HAZE = 4.2; // the depth over which a trunk loses most of its contrast\n\n var N = COLS * ROWS;\n var airTone2 = new Float32Array(N); // air above the horizon AND ground below it\n var airDir = new Float32Array(N);\n var trunkTone = new Float32Array(N);\n var trunkAlong = new Float32Array(N);\n var trunkAcross = new Float32Array(N);\n var shadowMask = new Float32Array(N);\n var rayDir = new Float32Array(N);\n\n for (var r2 = 0; r2 < ROWS; r2++) {\n for (var c = 0; c < COLS; c++) {\n var u = c / (COLS - 1), v = r2 / (ROWS - 1);\n var idx = r2 * COLS + c;\n var air = airTone(u, v);\n\n // 🔴 Air and ground are ONE tone map, ruled level by one family of\n // passes. Kept as two, they were gated and marked differently, so equal\n // tones drew as unequal densities: the floor of the wood ended at the\n // horizon in an edge like a table top, and every trunk stepped in value\n // there, because the air ran under it above the horizon and nothing ran\n // under it below. Far ground now goes to exactly the air's value, so the\n // horizon dissolves into the mist wherever the light says it should.\n var base = air, dg = 0, gxg = 0;\n if (v >= hv) {\n var rec = (v - hv) / (1 - hv);\n if (rec < DNEAR / 60) rec = DNEAR / 60;\n dg = DNEAR / rec;\n gxg = (u - vpU) * dg * XK;\n var hg = Math.exp(-(dg - 0.8) / HAZE);\n base = air + (0.17 - air) * hg; // ground raked by low light: one pass\n }\n var levelDir = 0.05 * kink(u, v) + 0.03 * mist(u, v);\n\n // Nearest tree covering this cell, if any.\n var hit = null, geo = null;\n for (var ti = 0; ti < trees.length; ti++) {\n var g = trunkAt(trees[ti], v);\n if (g && Math.abs(u - g.cu) < g.hw) { hit = trees[ti]; geo = g; break; }\n }\n\n if (hit) {\n // 🔴 The air runs UNDER the trunks. Cut out round each one, it gave\n // every trunk a bright outline on both sides (two masks that abut do\n // not meet) and cut the air between trunks into hatched panels. So a\n // trunk only adds the tone it has IN EXCESS of what lies behind it,\n // which is also the right model of haze: a far trunk is the air plus a\n // little, and near the sun the little goes to nothing.\n var x = (u - geo.cu) / geo.hw; // -1..1 across the trunk\n var toSun = sunU > geo.cu ? 1 : -1;\n var xs = x * toSun; // 1 at the edge facing the sun\n var h = Math.exp(-(hit.d - 0.8) / HAZE);\n var Tint = 0.80 + 0.06 * bark(u, v);\n Tint -= 0.10 * smooth(-0.55, -1.0, xs); // sky fill on the shadow side\n var ex = (Tint - base) * h;\n // The lit edge: a hair of bare paper on the side facing the sun, and\n // only where there is bright air behind the trunk to light it. Wider,\n // or everywhere, it was a white stripe down every tree.\n // Its jitter is kept small: at twice this the edge read as torn paper.\n var rim = xs > 0.86 + 0.03 * edge(u, v) && air < 0.20 && h > 0.25;\n trunkTone[idx] = rim ? 0 : (ex < 0 ? 0 : ex > 1 ? 1 : ex);\n trunkAlong[idx] = -Math.PI / 2 + Math.atan(hit.lean * ASPECT) + 0.04 * kink(u, v);\n // Across the trunk the marks bow round it, the way a line drawn round\n // a column bends at its sides. Above eye level the rings are seen from\n // underneath, so they bow up at the middle.\n trunkAcross[idx] = Math.atan(0.45 * x * (v < hv ? 1 : -1)) + 0.03 * kink(u, v);\n airTone2[idx] = rim ? 0 : base;\n airDir[idx] = levelDir;\n continue;\n }\n\n if (v < hv) {\n airTone2[idx] = air;\n airDir[idx] = levelDir;\n continue;\n }\n\n // --- Ground, and the shadows cast across it ---\n var shade = 0;\n for (var tj = 0; tj < trees.length; tj++) {\n var tr = trees[tj];\n if (tr.d <= dg) continue; // shadows fall toward the viewer only\n var tt = tr.d - dg;\n var xc = tr.gx - tt * sx;\n var half = tr.wt * 0.5 * (1 + 0.05 * tt); // the penumbra spreads with distance\n var e = 1 - smooth(0.75, 1.1, Math.abs(gxg - xc) / half);\n if (e > shade) shade = e;\n }\n var hs = Math.exp(-(dg - 0.8) / (HAZE * 1.4));\n var Tg = base + 0.40 * shade * hs;\n airTone2[idx] = Tg < 0 ? 0 : Tg > 1 ? 1 : Tg;\n airDir[idx] = levelDir; // ground is ruled level, like the air\n // The shadows run to the sun's point on the horizon, so their marks do.\n var du = u - sunU, dv = (v - hv) / ASPECT;\n rayDir[idx] = Math.atan2(dv, du) + (du < 0 ? Math.PI : 0);\n if (shade * hs > 0.35 + 0.08 * edge(u, v)) shadowMask[idx] = 1;\n }\n }\n\n // --- Publish ----------------------------------------------------------\n var g2 = (typeof globalThis !== 'undefined') ? globalThis : window;\n g2.__genart_data = g2.__genart_data || {};\n g2.__genart_data.cols = COLS;\n g2.__genart_data.rows = ROWS;\n\n function pack(name, mag, ang, skew) {\n var f32 = new Float32Array(N * 3);\n for (var n = 0; n < N; n++) {\n var a = ang[n] + (skew || 0);\n var m = mag[n];\n if (!isFinite(a)) a = 0;\n if (!isFinite(m)) m = 0;\n f32[n * 3] = Math.cos(a);\n f32[n * 3 + 1] = Math.sin(a);\n f32[n * 3 + 2] = m;\n }\n g2.__genart_data[name] = f32;\n }\n\n /** Gate a tone map at a threshold, frayed by a lattice (or not at all, when null). */\n function gate(tone, th, fray) {\n var m = new Float32Array(N);\n for (var n = 0; n < N; n++) {\n if (tone[n] <= 0) continue;\n var uu = (n % COLS) / (COLS - 1), vv = Math.floor(n / COLS) / (ROWS - 1);\n var t = fray ? th + 0.07 * fray(uu, vv) : th;\n m[n] = tone[n] >= t ? 1 : 0;\n }\n return m;\n }\n\n // Air and ground. Unlike the barley, the first pass IS frayed: the glow is\n // meant to be bare paper, and its edge is the one boundary in the plate that\n // must not show.\n // ⚠️ The first two passes do NOT share a threshold, against the squall's\n // rule that crossing must start at the bottom of the stack. Shared, they put\n // two crossed passes over nearly the whole plate and it went to one murky\n // middle value. Most of the air here is a single ruling, as an engraved sky\n // is; the kink lattice is what keeps it from beating into corrugation.\n // 🔴 Passes 2 and 4 are traced LEFTWARD (skew + PI: the same orientation,\n // the other way along it). The flow-line stepper traces forward only from\n // each seed point and stops at the bounds, so the upstream edge of every\n // pass is thin for one line's length: lines seeded there only cover what\n // lies downstream. With all four passes running right, the left edge of the\n // plate measured 0.76 luminance against 0.30 a little further in, and the\n // ragged line starts along that ramp read as a scribbled border. Two passes\n // each way puts two full-density passes ending at each edge.\n pack('air1', gate(airTone2, 0.10, streak[0]), airDir, 0.06);\n pack('air2', gate(airTone2, 0.22, streak[1]), airDir, -0.14 + Math.PI);\n pack('air3', gate(airTone2, 0.34, streak[2]), airDir, 0.30);\n pack('air4', gate(airTone2, 0.48, streak[3]), airDir, -0.40 + Math.PI);\n\n // Trunks, gated on their tone in EXCESS of what lies behind them: grain\n // first, then the crossing that turns them round. Four passes at four\n // unrelated angles read as scribble; these stay close to the grain and only\n // the third goes round the bole.\n pack('trunk1', gate(trunkTone, 0.06, null), trunkAlong, 0);\n pack('trunk2', gate(trunkTone, 0.26, dith[2]), trunkAlong, 0.12);\n pack('trunk3', gate(trunkTone, 0.40, dith[3]), trunkAcross, 0);\n pack('trunk4', gate(trunkTone, 0.52, dith[0]), trunkAlong, -0.16);\n\n pack('shadow', shadowMask, rayDir, 0);\n}\n", "layers": [ { "id": "sheet", "type": "textures:paper", "name": "Sheet", "visible": true, "locked": false, "opacity": 1, "blendMode": "normal", "transform": { "x": 0, "y": 0, "width": 1400, "height": 1000, "rotation": 0, "scaleX": 1, "scaleY": 1, "anchorX": 0, "anchorY": 0 }, "properties": { "preset": "rough", "roughness": -1, "color": "#ece3d4", "seed": 7788 } }, { "id": "air-1", "type": "painting:flow-lines", "name": "Air and Ground Pass 1 — Ruled", "visible": true, "locked": false, "opacity": 1, "blendMode": "normal", "transform": { "x": 105, "y": 75, "width": 1190, "height": 810, "rotation": 0, "scaleX": 1, "scaleY": 1, "anchorX": 0, "anchorY": 0 }, "properties": { "field": "algorithm:air1", "fieldCols": 400, "fieldRows": 300, "minMagnitude": 0.5, "seed": 7799, "lineCount": 26000, "seedDistribution": "grid-jittered", "lineLength": 18, "stepSize": 4, "lineWeight": 1.04, "lineWeightVariation": 0.14, "taper": "none", "color": "#2b1a12", "colorVariation": 0.05, "opacity": 0.24, "paintMode": "multiply", "depthScale": false, "horizonY": 0.61, "depthWeightRange": "[0.70, 1.08]", "depthOpacityRange": "[0.90, 1.00]", "maskCenterY": -1, "maskSpread": 0.25 } }, { "id": "air-2", "type": "painting:flow-lines", "name": "Air and Ground Pass 2 — Crossed", "visible": true, "locked": false, "opacity": 1, "blendMode": "normal", "transform": { "x": 105, "y": 75, "width": 1190, "height": 810, "rotation": 0, "scaleX": 1, "scaleY": 1, "anchorX": 0, "anchorY": 0 }, "properties": { "field": "algorithm:air2", "fieldCols": 400, "fieldRows": 300, "minMagnitude": 0.5, "seed": 7811, "lineCount": 22000, "seedDistribution": "grid-jittered", "lineLength": 16, "stepSize": 4, "lineWeight": 1.04, "lineWeightVariation": 0.14, "taper": "none", "color": "#2b1a12", "colorVariation": 0.05, "opacity": 0.22, "paintMode": "multiply", "depthScale": false, "horizonY": 0.61, "depthWeightRange": "[0.70, 1.08]", "depthOpacityRange": "[0.90, 1.00]", "maskCenterY": -1, "maskSpread": 0.25 } }, { "id": "air-3", "type": "painting:flow-lines", "name": "Air and Ground Pass 3 — Canopy and Shade", "visible": true, "locked": false, "opacity": 1, "blendMode": "normal", "transform": { "x": 105, "y": 75, "width": 1190, "height": 810, "rotation": 0, "scaleX": 1, "scaleY": 1, "anchorX": 0, "anchorY": 0 }, "properties": { "field": "algorithm:air3", "fieldCols": 400, "fieldRows": 300, "minMagnitude": 0.5, "seed": 7825, "lineCount": 24000, "seedDistribution": "grid-jittered", "lineLength": 12, "stepSize": 4, "lineWeight": 1.12, "lineWeightVariation": 0.14, "taper": "none", "color": "#2b1a12", "colorVariation": 0.05, "opacity": 0.32, "paintMode": "multiply", "depthScale": false, "horizonY": 0.61, "depthWeightRange": "[0.70, 1.08]", "depthOpacityRange": "[0.90, 1.00]", "maskCenterY": -1, "maskSpread": 0.25 } }, { "id": "air-4", "type": "painting:flow-lines", "name": "Air and Ground Pass 4 — Deepest Only", "visible": true, "locked": false, "opacity": 1, "blendMode": "normal", "transform": { "x": 105, "y": 75, "width": 1190, "height": 810, "rotation": 0, "scaleX": 1, "scaleY": 1, "anchorX": 0, "anchorY": 0 }, "properties": { "field": "algorithm:air4", "fieldCols": 400, "fieldRows": 300, "minMagnitude": 0.5, "seed": 7829, "lineCount": 22000, "seedDistribution": "grid-jittered", "lineLength": 9, "stepSize": 4, "lineWeight": 1.2, "lineWeightVariation": 0.14, "taper": "none", "color": "#2b1a12", "colorVariation": 0.05, "opacity": 0.4, "paintMode": "multiply", "depthScale": false, "horizonY": 0.61, "depthWeightRange": "[0.70, 1.08]", "depthOpacityRange": 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