Penrose generator

using UnityEngine;
//from tutorial at https://youtu.be/7LlZeBpabG8
public class PenroseGenerator : MonoBehaviour
{
    [SerializeField] GameObject cubePrefab;
    [SerializeField] int desiredCubesPerSide;

    void Start()
    {
        GenerateTriangle(desiredCubesPerSide);
    }

    //works for cubesPerside 4+
    void GenerateTriangle(int cubesPerSide)
    {
        Vector3 initialPosition = Vector3.zero;

        //generate first cube at origin
        GameObject firstCube = Instantiate(cubePrefab,initialPosition,Quaternion.identity);

        //keep track of last cubes instantiated
        GameObject lastCubeOnX = firstCube;
        GameObject lastCubeOnZ = firstCube;

        //generates cube rows toward x and -z
        for(int i = 1; i<cubesPerSide; i++)
        {
            //x
            Vector3 currentXposition = initialPosition;
            currentXposition.x = i;
            lastCubeOnX = Instantiate(cubePrefab,currentXposition,Quaternion.identity);

            //z
            Vector3 currentZposition = initialPosition;
            currentZposition.z = -i;
            lastCubeOnZ = Instantiate(cubePrefab,currentZposition,Quaternion.identity);
        }

        //keeps track of cube at bottom of column
        GameObject lastCubeOnY = lastCubeOnX;

        //generate column downwards from lastCubeOnX
        //will end up (visually) above lastCubeOnZ
        for(int i = 1; i<cubesPerSide-1; i++)
        {
            Vector3 currentPosition = lastCubeOnX.transform.position;
            currentPosition.y = -i;
            lastCubeOnY = Instantiate(cubePrefab,currentPosition,Quaternion.identity);
        }

        //create a copy of last cube to place on top of the lastCubeOnZ
        int offset = cubesPerSide-1;
        Vector3 matchingPosition = lastCubeOnY.transform.position + new Vector3(-offset,offset,-offset);
        GameObject lastCubeCopy = Instantiate(lastCubeOnY, matchingPosition,Quaternion.identity);

        //visually remove top face on the copy
        lastCubeCopy.transform.GetChild(0).gameObject.SetActive(false);
    }

}