BSPNode.setParentNode C# (CSharp) Method

    public void setParentNode(BSPNode _aNode)
    {
        parentNode = _aNode;
    }

    void splitZ(GameObject _aSection)
    {
        float zSplit  = Random.Range(20, _aSection.transform.localScale.z - 20);
        float zSplit1 = _aSection.transform.localScale.z - zSplit;

        if (zSplit > 20)
        {
            GameObject cube0 = GameObject.CreatePrimitive(PrimitiveType.Cube);
            cube0.transform.localScale = new Vector3(_aSection.transform.localScale.x, _aSection.transform.localScale.y, zSplit);
            cube0.transform.position   = new Vector3(
                _aSection.transform.position.x,
                _aSection.transform.position.y,
                _aSection.transform.position.z - ((zSplit - _aSection.transform.localScale.z) / 2));
            cube0.renderer.material.color = new Color(Random.Range(0.0f, 1.0f), Random.Range(0.0f, 1.0f), Random.Range(0.0f, 1.0f));
            cube0.tag = "GenSection";
            leftNode  = new BSPNode();
            leftNode.setCube(cube0);
            leftNode.setParentNode(this);

            GameObject cube1 = GameObject.CreatePrimitive(PrimitiveType.Cube);
            cube1.transform.localScale = new Vector3(_aSection.transform.localScale.x, _aSection.transform.localScale.y, zSplit1);
            cube1.transform.position   = new Vector3(
                _aSection.transform.position.x,
                _aSection.transform.position.y,
                _aSection.transform.position.z + ((zSplit1 - _aSection.transform.localScale.z) / 2));
            cube1.renderer.material.color = new Color(Random.Range(0.0f, 1.0f), Random.Range(0.0f, 1.0f), Random.Range(0.0f, 1.0f));
            cube1.tag = "GenSection";
            rightNode = new BSPNode();
            rightNode.setCube(cube1);
            rightNode.setParentNode(this);

            GameObject.DestroyImmediate(_aSection);
        }
    }