Function createGrid

geometry.js:2–36

(i, count)

// --- PATTERN FUNCTIONS ---
function createGrid(i, count) {
    const sideLength = Math.ceil(Math.cbrt(count));
    const spacing = 60 / sideLength;
    const halfGrid = (sideLength - 1) * spacing / 2;
    
    // Determine which side of the cube this particle should be on
    const totalSides = 6; // A cube has 6 sides
    const pointsPerSide = Math.floor(count / totalSides);
    const side = Math.floor(i / pointsPerSide);
    const indexOnSide = i % pointsPerSide;
    
    // Calculate a grid position on a 2D plane
    const sideLength2D = Math.ceil(Math.sqrt(pointsPerSide));
    const ix = indexOnSide % sideLength2D;
    const iy = Math.floor(indexOnSide / sideLength2D);
    
    // Map to relative coordinates (0 to 1)
    const rx = ix / (sideLength2D - 1 || 1);
    const ry = iy / (sideLength2D - 1 || 1);
    
    // Convert to actual coordinates with proper spacing (-halfGrid to +halfGrid)
    const x = rx * spacing * (sideLength - 1) - halfGrid;
    const y = ry * spacing * (sideLength - 1) - halfGrid;
    
    // Place on the appropriate face of the cube
    switch(side % totalSides) {
        case 0: return new THREE.Vector3(x, y, halfGrid); // Front face
        case 1: return new THREE.Vector3(x, y, -halfGrid); // Back face
        case 2: return new THREE.Vector3(x, halfGrid, y); // Top face
        case 3: return new THREE.Vector3(x, -halfGrid, y); // Bottom face
        case 4: return new THREE.Vector3(halfGrid, x, y); // Right face
        case 5: return new THREE.Vector3(-halfGrid, x, y); // Left face
        default: return new THREE.Vector3(0, 0, 0);
    }
}

function createSphere(i, count) {
    // Sphere distribution using spherical coordinates for surface only