function addCube() {
    cubePos.push([Math.random() * 1000 - 500, Math.random() * 1000 - 500, Math.random() * 30 - 200,
    Math.random() * 2 - 1, Math.random() * 2 - 1, Math.random() * 2 - 1
    ])
}

let upgrades = [
    {
        'name': 'Set',
        'price': 10,
        'exec': addCube
    }
]

let hud2 = document.querySelector('.hud');

for (let upgrade of upgrades) {
    let button = document.createElement("div");
    button.classList.add('item');
    button.textContent = `Buy ${upgrade.name} for ${upgrade.price} nil`
    hud2.appendChild(button);

    button.addEventListener('click', () => {
        if (nothingness < upgrade.price) return;
        nothingness -= upgrade.price;
        upgrade.price *= 1.02;
        button.textContent = `Buy ${upgrade.name} for ${upgrade.price} nil`
        upgrade.exec();
    })
}