/// <summary>
/// Call this function to change the material the rocket is made of.
/// Different materials affect the mass of the rocket and cost of the rocket.
/// </summary>
/// <param name="value">The index of the rocket material to use.</param>
public void SetRocketMaterial(int value)
{
currentMaterialIndex = value;
UIManager.Instance.UpdateRocketMaterial(rocketMaterials[value]);
rocket.SetMass(rocketMaterials[value].weight);
UpdateBudget();
}