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// Forked from "Signal Restored" by ge1doot
// https://turtletoy.net/turtle/782a9f5329
// "Signal Restored" by ge1doot
// 30 Nov 2025
// After months of silence, the channel cracked open and her voice returned. 
// Only three words: I am here.
//
// ########## Tiny module helpers ##########
function module(bodyFn) {
    return bodyFn();
}
function expose(obj) {
    return obj;
}
// --- User controls (Turtletoy sliders) ------------------
// --- User controls (Turtletoy sliders) ------------------
// RNG / reproducibility
const randomMode = 1; // min=0, max=1, step=1, (Deterministic, Random)
const Seed = "123";   // type=string, Enter your seed!
// Pen / drawing
const PenOpacity     = 0.90; // min=0, max=1, step=0.01
const DebugText      = 1;    // min=0, max=1, step=1, (Off, On)
// CFDG / recursion
const GlobalScale    = 0.25; // min=0.05, max=1.0, step=0.01
const MaxDepth       = 14;   // min=1, max=30, step=1
const MinSize        = 0.00; // min=0, max=0.20, step=0.005
const MinComplexity  = 50;   // min=0, max=500, step=10
// Grid / structure
const TileExtent     = 1;    // min=0, max=3, step=1   (controls start() grid size)
const XSpacing       = 3.00; // min=0.5, max=8, step=0.1
const YSpacing       = 1.50; // min=0.5, max=8, step=0.1
const ZSpacing       = 3.10; // min=0.5, max=8, step=0.1
const BrightLo       = 0.50; // min=0, max=1, step=0.01
const BrightHi       = 1.00; // min=0, max=2, step=0.01
// Lighting / shading
const LightDirX      = 0.50; // min=-1, max=1, step=0.05
const LightDirY      = 1.00; // min=-1, max=1, step=0.05
const LightDirZ      = 0.40; // min=-1, max=1, step=0.05
const Ambient        = 0.15; // min=0, max=1, step=0.01
const Diffuse        = 0.90; // min=0, max=2, step=0.01
const Contrast       = 1.40; // min=0, max=3, step=0.05
const LightThreshold = 0.75; // min=0, max=1, step=0.01
const UseBright      = 1;    // min=0, max=1, step=1, (Off, On)
// Hatching
const HatchMinSpacing     = 0.10; // min=0.02, max=1.0, step=0.01
const HatchMinArea        = 20;   // min=0, max=400, step=5
const HatchMinHatchArea   = 60;   // min=0, max=800, step=10
const SpacingDarkFactor   = 0.25; // min=0.05, max=2, step=0.05
const SpacingLightFactor  = 3.50; // min=0.5, max=10, step=0.25
// Line stylization
const WobbleOn      = 0;     // min=0, max=1, step=1
const WobbleAmp     = 0;   // min=0, max=5, step=0.1      (screen units)
const WobbleFreq    = 0;  // min=0.02, max=2, step=0.01  (cycles per segment)
const WobbleSteps   = 0;    // min=2, max=60, step=1       (polyline resolution)
const CurveOn       = 0;     // min=0, max=1, step=1
const CurveAmount   = 0;  // min=0, max=1, step=0.01     (how “bent” edges are)
const CurveSteps    = 0;    // min=2, max=80, step=1       (bezier approx resolution)
const EdgeBreakup   = 0.0;   // min=0, max=1, step=0.01     (optional: randomize per-edge)
// Camera
const CamAuto        = 0;    // min=0, max=1, step=1, (Manual, AutoFit)
const CamFov         = 120;  // min=10, max=170, step=1
const CamYawBase     = -90;  // min=-180, max=180, step=1
const CamYawJitter   = 180;  // min=0, max=360, step=1
const CamRadius      = 10;   // min=1, max=60, step=0.5
const CamHeightBase  = -3;   // min=-30, max=30, step=0.5
const CamHeightJitter= 9;    // min=0, max=60, step=0.5
const CamRollBase    = -3;   // min=-45, max=45, step=0.5
const CamRollJitter  = 6;    // min=0, max=45, step=0.5
Canvas.setpenopacity(PenOpacity);
const turtle = new Turtle();
turtle.pendown();
// ########## CFDG rules ##########
const cfdgRules = {
    setup: {
      start: "start",
      transform: { s: GlobalScale },
      maxDepth: MaxDepth,
      minSize: MinSize,
      minComplexity: MinComplexity,
    
      hatching: {
        minSpacing: HatchMinSpacing,
        minArea: HatchMinArea,
        minHatchArea: HatchMinHatchArea
      },
      shading: {
        dir: [LightDirX, LightDirY, LightDirZ],
        ambient: Ambient,
        diffuse: Diffuse,
        contrast: Contrast,
        lightThreshold: LightThreshold,
        spacingDarkFactor: SpacingDarkFactor,
        spacingLightFactor: SpacingLightFactor,
        mode: "directional",
        useBright: (UseBright === 1)
      },
    
      camera: {
        auto: (CamAuto === 1),
        fov: CamFov,
        yaw: CamYawBase + Math.random() * CamYawJitter,
        radius: CamRadius,
        height: CamHeightBase + Math.random() * CamHeightJitter,
        roll: CamRollBase + Math.random() * CamRollJitter
      }
    },
    
    start(s) {
      const t = TileExtent;
      for (let x = -t; x <= t; x++) {
        for (let y = -t; y <= t; y++) {
          for (let z = -t; z <= t; z++) {
            if (x === 0 || y === 0 || z === 0) continue;
            const br = BrightLo + (BrightHi - BrightLo) * rnd();
            rule.R1(s, { x: XSpacing * x, y: YSpacing * y, z: ZSpacing * z, s: 1, l: br });
          }
        }
      }
    },
    R1: [
        100,
        (s) => {
            rule.grid(s, { l: rnd() > 0.5 ? -1 : 1 });
            rule.R1(s, { z: 0.4, rx: 90 });
        },
        100,
        (s) => {
            CUBE(s, { s: [0.15, 0.15, 4] });
            rule.R1(s, { z: 0.395, rx: 90, ry: -90, s: 0.998 });
        },
        60,
        (s) => {
            TUBE(s);
            rule.R1(s, { z: 0.401, rx: 90, ry: 90, s: 0.998 });
        },
        20,
        (s) => {
            CUBE(s, { s: 1.1 });
            rule.R1(s, { z: 0.402, rx: 90, ry: -90 });
        },
        20,
        (s) => {
            PLANE(s, { s: 0.9 });
            rule.R1(s, { z: 0.403, rx: -90, ry: 90 });
        },
        30,
        (s) => {
            rule.R1(s, { rx: 90, s: [4, 1.3, 1] });
            rule.R1(s, { rz: 180, s: [0.99, 1, 1.7] });
        },
        40,
        (s) => {
            rule.R1(s, { rx: 90, s: [0.6, 4.5, 1.5] });
            rule.R1(s, { rz: -90, s: [1.01, 1.01, 0.7] });
        }
    ],
    grid(s) {
        CUBE(s, { x: 0, s: [0.11, 1.1, 1.1] });
        CUBE(s, { x: 0.2, s: [0.11, 1.1, 1.1] });
        CUBE(s, { x: 0.4, s: [0.11, 1.1, 1.1] });
        CUBE(s, { x: 0.6, s: [0.11, 1.1, 1.1] });
        CUBE(s, { x: 0.8, s: [0.11, 1.1, 1.1] });
        CUBE(s, { x: 1, s: [0.11, 1.1, 1.1] });
    }
};
// ########## math3d module ##########
const math3d = module(() => {
    const v0 = [0, 0, 0];
    const v1 = [0, 0, 0];
    const v2 = [0, 0, 0];
    const v3 = [0, 0, 0];
    const v4 = [0, 0, 0];
    const v5 = [0, 0, 0];
    const v6 = [0, 0, 0];
    const v7 = [0, 0, 0];
    
    function vec3(x = 0, y = 0, z = 0) {
        return [x, y, z];
    }
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