Convert a 1D array into a 3D grid

arrayTo3DGrid.js

function arrayTo3DGrid(xMax, yMax, zMax) {
    let vertices = []
    let totalVertices = xMax * yMax * zMax;
    let xySquare = xMax * yMax;
    for (let i = 0; i < totalVertices; i++) {
        let x = i % xMax;
        let z = Math.floor(i / (xySquare));
        let ii = i - (z * xySquare);
        let y = Math.floor(ii / xMax);
        vertices.push(x, y, z);
    }
    return vertices;
}

function spriteTest1() {
    let xMax = 100;
    let yMax = 100;
    let zMax = 100;
    return arrayTo3DGrid(xMax, yMax, zMax)
}