Marching Squares Tutorial Visualization

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using System.Collections.Generic;


public class Manager : MonoBehaviour {

    List<Vector3> vertices;
    List<List<int>> triangles;
    public GraphicNode[] nodes;
    public Transform[] nodeP;

    public TextMesh binaryText;
    public TextMesh configText;

    public void SelectNode(int index) {
        nodes[index].Toggle();
        int val = 0;
        int n = 8;
        string binary = "";
        for (int i =0; i < nodes.Length; i ++) {
            if (nodes[i].isControl) {
                if (nodes[i].active) {
                    binary += "1";
                    val += n;
                }
                else {
                    binary += "0";
                }
                n = n >> 1;
                //print (n);
            }
        }
        //print (val);
        binaryText.text = binary;
        configText.text ="=" +val;
        Triangulate(val);

        Mesh mesh = new Mesh();
        GetComponent<MeshFilter>().mesh = mesh;
        GetComponent<MeshRenderer>();

        mesh.subMeshCount = triangles.Count;
        mesh.vertices = vertices.ToArray();
        for (int i = 0; i < triangles.Count; i ++) {
            mesh.SetTriangles(triangles[i].ToArray(),i);
        }


        //mesh.triangles = triangles.ToArray();
        mesh.RecalculateNormals();
    }

    void Triangulate(int configuration) {
        for (int i = 0; i < nodes.Length ; i ++) {
            if (nodes[i].isControl == false) {
                nodes[i].Clear();
            }
        }
        vertices = new List<Vector3>();
        triangles = new List<List<int>>();

        switch (configuration) {
        case 0: // 0000
            return;
        case 15: // 1111
            MeshFromPoints(nodeP[0].position, nodeP[2].position, nodeP[4].position, nodeP[6].position);
            Active(0,2,4,6);
            break;

            // 1 point:
        case 8: // 1000
            //print ("AWE");
            MeshFromPoints(nodeP[0].position, nodeP[1].position, nodeP[7].position);
            Active(0,1,7);
            break;
        case 4: // 0100
            MeshFromPoints(nodeP[1].position,nodeP[2].position, nodeP[3].position);
            Active(1,2,3);
            break;
        case 2: // 0010
            MeshFromPoints(nodeP[3].position,nodeP[4].position, nodeP[5].position);
            Active(3,4,5);
            break;
        case 1: // 0001
            MeshFromPoints( nodeP[5].position,nodeP[6].position, nodeP[7].position);
            Active(5,6,7);
            break;

            // 2 points:
        case 12: // 1100
            MeshFromPoints(nodeP[0].position, nodeP[2].position, nodeP[3].position, nodeP[7].position);
            Active(0,2,3,7);
            break;
        case 9: // 1001
            Active(0,1,5,6);
            MeshFromPoints(nodeP[0].position, nodeP[1].position, nodeP[5].position, nodeP[6].position);
            break;
        case 6: // 0110
            Active(1,2,4,5);
            MeshFromPoints( nodeP[1].position,nodeP[2].position, nodeP[4].position, nodeP[5].position);
            break;
        case 3: // 0011
            Active(3,4,6,7);
            MeshFromPoints(nodeP[3].position,nodeP[4].position, nodeP[6].position, nodeP[7].position );
            break;
        case 10: // 1010
            Active(0,1,3,4,5,7);
            MeshFromPoints(nodeP[0].position, nodeP[1].position, nodeP[3].position, nodeP[4].position, nodeP[5].position, nodeP[7].position);
            break;
        case 5: // 0101
            Active(1,2,3,5,6,7);
            MeshFromPoints(nodeP[1].position, nodeP[2].position, nodeP[3].position, nodeP[5].position, nodeP[6].position, nodeP[7].position);
            break;

            // 3 points:
        case 14: // 1110
            Active(0,2,4,5,7);
            MeshFromPoints(nodeP[0].position, nodeP[2].position, nodeP[4].position, nodeP[5].position, nodeP[7].position);
            break;
        case 11: // 1011
            Active(0,1,3,4,6);
            MeshFromPoints(nodeP[0].position, nodeP[1].position, nodeP[3].position, nodeP[4].position, nodeP[6].position);
            break;
        case 7: // 0111
            Active(1,2,4,6,7);
            MeshFromPoints(nodeP[1].position, nodeP[2].position, nodeP[4].position, nodeP[6].position, nodeP[7].position);
            break;
        case 13: // 1101
            Active(0,2,3,5,6);
            MeshFromPoints(nodeP[0].position, nodeP[2].position, nodeP[3].position, nodeP[5].position, nodeP[6].position);
            break;
        }
    }

    void Active(params int[] a) {
        string letters = "ABCDEFGHIJKLMOP";
        for (int i = 0; i < a.Length ; i ++) {
            nodes[a[i]].SetActive();
            nodes[a[i]].text.text = letters[i] + "";
        }
    }

    void MeshFromPoints(params Vector3[] nodes) {
        for (int i = 0; i < nodes.Length; i ++) {
            //print (nodes[i]);
        }
        if (nodes.Length >= 3)
            CreateTriangle(nodes[0],nodes[1],nodes[2]);
        if (nodes.Length >= 4)
            CreateTriangle(nodes[0],nodes[2],nodes[3]);
        if (nodes.Length >= 5)
            CreateTriangle(nodes[0],nodes[3],nodes[4]);
        if (nodes.Length >= 6)
            CreateTriangle(nodes[0],nodes[4],nodes[5]);
    }


    void CreateTriangle(Vector3 a, Vector3 b, Vector3 c) {
        vertices.Add(a);
        vertices.Add(b);
        vertices.Add(c);

        List<int> t = new List<int>();

        t.Add(vertices.Count-3);
        t.Add(vertices.Count-2);
        t.Add(vertices.Count-1);
        triangles.Add(t);
    }

}

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class GraphicNode : MonoBehaviour {

    public int index;
    public bool isControl;

    [HideInInspector]
    public bool active;

    public TextMesh text;

    Color controlSel;
    Color controlDes;

    Color sel;
    Color des;

    void Awake() {
        controlSel = Col (161,62,62);
        controlDes = Col (255,255,255);

        sel = Col (225,225,225);
        des = Col (105,105,105);
        text.text = "";
        Image i = GetComponent<Image>();
        if (!isControl) {
            i.color = (active)?sel:des;
        }
        else {
            i.color = (active)?controlSel:controlDes;
        }
    }

    Color Col(float r, float g, float b) {
        return new Color(r/255f,g/255f, b/255f);
    }

    public void Toggle() {
        active = !active;
        Image i = GetComponent<Image>();

        if (!isControl) {
            i.color = (active)?sel:des;
        }
        else {
            i.color = (active)?controlSel:controlDes;
        }

        if (!active)
            text.text = "";
    }

    public void SetActive() {
        active = false;
        Toggle();
    }

    public void Clear() {
        active = true;
        Toggle();
    }

}