//---------------------------------------------------------------------------------------------------
protected CubeInfo Spawn(int x, int y, int z)
{
float center = (size - 1) * 0.5f;
Vector3 position = new Vector3(
(x - center) * 2f,
(y - center) * 2f,
(z - center) * 2f
);
CubeInfo cube = Instantiate <CubeInfo>(prefCube, position, Quaternion.identity);
cube.SetOriginalPosition(position);
cube.GetComponent <MeshRenderer>().material.color = new Color(
x * 1f / size,
y * 1f / size,
z * 1f / size
);
return(cube);
}