how to get two script edited mesh colliders to collide.

I know this is asked a lot, but none of the other answers fixed my problem. this is the script of the terrain:

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

public class PolygonGenerator : MonoBehaviour {

 public List<Vector3> newVertices = new List<Vector3>();
 public List<int> newTriangles = new List<int>();
 public List<Vector2> newUV = new List<Vector2>();
 
 public List<Vector3> colVertices = new List<Vector3>();
 public List<int> colTriangles = new List<int>();
 private int colCount;
 
 private Mesh mesh;
 private MeshCollider col;
 
 private float tUnit = 0.25f;
 public Vector2 tStone = new Vector2 (0f,0f);
 public Vector2 tGrass = new Vector2 (0f,.5f);
 
 
 public byte[,] blocks;
 private int squareCount;
 public bool update=false;
 
 
 // Use this for initialization
 void Start () {
     mesh = GetComponent<MeshFilter> ().mesh;
     col = GetComponent<MeshCollider> ();
     
     GenTerrain();
     BuildMesh();
     UpdateMesh();
 }
 
 void Update(){
     if(update){
         BuildMesh();
         UpdateMesh();
         update=false;
     }
 }
 
 
 int NoiseInt (int x, int y, float scale, float mag, float exp){
     
     return (int) (Mathf.Pow ((Mathf.PerlinNoise(x/scale,y/scale)*mag),(exp) ));
     
     
 }
 
 void GenTerrain(){
     blocks=new byte[96,128];
     
     for(int px=0;px<blocks.GetLength(0);px++){
         int stone= NoiseInt(px,0, 80,15,1);
         stone+= NoiseInt(px,0, 50,30,1);
         stone+= NoiseInt(px,0, 10,10,1);
         stone+=75;
         
         
         int dirt = NoiseInt(px,0, 100f,35,1);
         dirt+= NoiseInt(px,100, 50,30,1);
         dirt+=75;
         
         
         for(int py=0;py<blocks.GetLength(1);py++){
             if(py<stone){
                 blocks[px, py]=1;
                 
                 if(NoiseInt(px,py,12,16,1)>10){  //dirt spots
                     blocks[px,py]=2;
                     
                 }
                 
                 if(NoiseInt(px,py*2,16,14,1)>10){ //Caves
                     blocks[px,py]=0;
                     
                 }
                 
             } else if(py<dirt) {
                 blocks[px,py]=2;
             }
             
             
         }
     }
 }
 
 void BuildMesh(){
     for(int px=0;px<blocks.GetLength(0);px++){
         for(int py=0;py<blocks.GetLength(1);py++){
             
             if(blocks[px,py]!=0){
                 
                 GenCollider(px,py);
                 
                 if(blocks[px,py]==1){
                     GenSquare(px,py,tStone);
                 } else if(blocks[px,py]==2){
                     GenSquare(px,py,tGrass);
                 }
             }
         }
     }
 }
 
 byte Block (int x, int y){
     
     if(x==-1 || x==blocks.GetLength(0) || y==-1 || y==blocks.GetLength(1)){
         return (byte)1;
     }
     
     return blocks[x,y];
 }
 
 void GenCollider(int x, int y){
     
     
     //Top
     if(Block(x,y+1)==0){
         colVertices.Add( new Vector3 (x  ,  y  , 1));
         colVertices.Add( new Vector3 (x + 1 ,  y  , 1));
         colVertices.Add( new Vector3 (x + 1 ,  y , 0 ));
         colVertices.Add( new Vector3 (x  ,  y  , 0 ));
         
         ColliderTriangles();
         
         colCount++;
     }
     
     //bot
     if(Block(x,y-1)==0){
         colVertices.Add( new Vector3 (x  ,  y -1 , 0));
         colVertices.Add( new Vector3 (x + 1 ,  y -1 , 0));
         colVertices.Add( new Vector3 (x + 1 ,  y -1 , 1 ));
         colVertices.Add( new Vector3 (x  ,  y -1 , 1 ));
         
         ColliderTriangles();
         colCount++;
     }
     
     //left
     if(Block(x-1,y)==0){
         colVertices.Add( new Vector3 (x  ,  y -1 , 1));
         colVertices.Add( new Vector3 (x  ,  y  , 1));
         colVertices.Add( new Vector3 (x  ,  y  , 0 ));
         colVertices.Add( new Vector3 (x  ,  y -1 , 0 ));
         
         ColliderTriangles();
         
         colCount++;
     }
     
     //right
     if(Block(x+1,y)==0){
         colVertices.Add( new Vector3 (x +1 ,  y  , 1));
         colVertices.Add( new Vector3 (x +1 ,  y -1 , 1));
         colVertices.Add( new Vector3 (x +1 ,  y -1 , 0 ));
         colVertices.Add( new Vector3 (x +1 ,  y  , 0 ));
         
         ColliderTriangles();
         
         colCount++;
     }
     
 }
 
 void ColliderTriangles(){
     colTriangles.Add(colCount*4);
     colTriangles.Add((colCount*4)+1);
     colTriangles.Add((colCount*4)+3);
     colTriangles.Add((colCount*4)+1);
     colTriangles.Add((colCount*4)+2);
     colTriangles.Add((colCount*4)+3);
 }
 
 
 void GenSquare(int x, int y, Vector2 texture){
     
     newVertices.Add( new Vector3 (x  ,  y  , 0 ));
     newVertices.Add( new Vector3 (x + 1 ,  y  , 0 ));
     newVertices.Add( new Vector3 (x + 1 ,  y-1 , 0 ));
     newVertices.Add( new Vector3 (x  ,  y-1 , 0 ));
     
     newTriangles.Add(squareCount*4);
     newTriangles.Add((squareCount*4)+1);
     newTriangles.Add((squareCount*4)+3);
     newTriangles.Add((squareCount*4)+1);
     newTriangles.Add((squareCount*4)+2);
     newTriangles.Add((squareCount*4)+3);
     
     newUV.Add(new Vector2 (tUnit * texture.x, tUnit * texture.y + tUnit));
     newUV.Add(new Vector2 (tUnit * texture.x + tUnit, tUnit * texture.y + tUnit));
     newUV.Add(new Vector2 (tUnit * texture.x + tUnit, tUnit * texture.y));
     newUV.Add(new Vector2 (tUnit * texture.x, tUnit * texture.y));
     
     squareCount++;
     
 }
 
 void UpdateMesh () {
     mesh.Clear ();
     mesh.vertices = newVertices.ToArray();
     mesh.triangles = newTriangles.ToArray();
     mesh.uv = newUV.ToArray();
     mesh.Optimize ();
     mesh.RecalculateNormals ();
     
     newVertices.Clear();
     newTriangles.Clear();
     newUV.Clear();
     squareCount=0;
     
     Mesh newMesh = new Mesh();
     newMesh.vertices = colVertices.ToArray();
     newMesh.triangles = colTriangles.ToArray();
     col.sharedMesh= newMesh;
     
     colVertices.Clear();
     colTriangles.Clear();
     colCount=0;
 }

} and this is the script for the object that needs to collide with the terrain:

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class vehicle : MonoBehaviour {
     
     public List<Vector3> newVertices = new List<Vector3>();
     public List<int> newTriangles = new List<int>();
     public List<Vector2> newUV = new List<Vector2>();
     
     public List<Vector3> colVertices = new List<Vector3>();
     public List<int> colTriangles = new List<int>();
     private int colCount;
     
     private Mesh mesh;
     private MeshCollider col;
     
     private float tUnit = 0.25f;
     public Vector2 tStone = new Vector2 (0f,0f);
     public Vector2 tGrass = new Vector2 (0f,.5f);
     
     
     public byte[,] blocks;
     private int squareCount;
     public bool update=false;
     
     
     // Use this for initialization
     void Start () {
         mesh = GetComponent<MeshFilter> ().mesh;
         col = GetComponent<MeshCollider> ();
         
         GenTerrain();
         BuildMesh();
         UpdateMesh();
 
         rigidbody.inertiaTensor = Vector3.one;
         rigidbody.inertiaTensorRotation = Quaternion.identity;
     }
     
     void Update(){
         if(update){
             BuildMesh();
             UpdateMesh();
             update=false;
         }
     }
     
     
     int NoiseInt (int x, int y, float scale, float mag, float exp){
         
         return (int) (Mathf.Pow ((Mathf.PerlinNoise(x/scale,y/scale)*mag),(exp) ));
         
         
     }
     
     void GenTerrain(){
         blocks=new byte[1,1];
         
         for(int px=0;px<blocks.GetLength(0);px++){
             int stone= NoiseInt(px,0, 80,15,1);
             stone+= NoiseInt(px,0, 50,30,1);
             stone+= NoiseInt(px,0, 10,10,1);
             stone+=75;
             
             
             int dirt = NoiseInt(px,0, 100f,35,1);
             dirt+= NoiseInt(px,100, 50,30,1);
             dirt+=75;
             
             
             for(int py=0;py<blocks.GetLength(1);py++){
                 if(py<stone){
                     blocks[px, py]=1;
                     
                     if(NoiseInt(px,py,12,16,1)>10){  //dirt spots
                         blocks[px,py]=2;
                         
                     }
                     
                     if(NoiseInt(px,py*2,16,14,1)>10){ //Caves
                         blocks[px,py]=0;
                         
                     }
                     
                 } else if(py<dirt) {
                     blocks[px,py]=2;
                 }
                 
                 
             }
         }
     }
     
     void BuildMesh(){
         for(int px=0;px<blocks.GetLength(0);px++){
             for(int py=0;py<blocks.GetLength(1);py++){
                 
                 if(blocks[px,py]!=0){
                     
                     GenCollider(px,py);
                     
                     if(blocks[px,py]==1){
                         GenSquare(px,py,tStone);
                     } else if(blocks[px,py]==2){
                         GenSquare(px,py,tGrass);
                     }
                 }
             }
         }
     }
     
     byte Block (int x, int y){
         
         if(x==-1 || x==blocks.GetLength(0) || y==-1 || y==blocks.GetLength(1)){
             return (byte)1;
         }
         
         return blocks[x,y];
     }
     
     void GenCollider(int x, int y){
         
     
         //Top
         if(Block(x,y+1) ==1){
             colVertices.Add( new Vector3 (x  ,  y  , 1));
             colVertices.Add( new Vector3 (x + 1 ,  y  , 1));
             colVertices.Add( new Vector3 (x + 1 ,  y , 0 ));
             colVertices.Add( new Vector3 (x  ,  y  , 0 ));
             colVertices.Add( new Vector3 (x  ,  y-1  , 1));
             colVertices.Add( new Vector3 (x + 1 ,  y-1  , 1));
             colVertices.Add( new Vector3 (x + 1 ,  y-1 , 0 ));
             colVertices.Add( new Vector3 (x  ,  y-1  , 0 ));
 
             ColliderTriangles();
             
             colCount++;
         }
         
         //bot
         if(Block(x,y-1)==0){
             colVertices.Add( new Vector3 (x  ,  y -1 , 0));
             colVertices.Add( new Vector3 (x + 1 ,  y -1 , 0));
             colVertices.Add( new Vector3 (x + 1 ,  y -1 , 1 ));
             colVertices.Add( new Vector3 (x  ,  y -1 , 1 ));
             
             ColliderTriangles();
             colCount++;
         }
         
         //left
         if(Block(x-1,y)==0){
             colVertices.Add( new Vector3 (x  ,  y -1 , 1));
             colVertices.Add( new Vector3 (x  ,  y  , 1));
             colVertices.Add( new Vector3 (x  ,  y  , 0 ));
             colVertices.Add( new Vector3 (x  ,  y -1 , 0 ));
             
             ColliderTriangles();
             
             colCount++;
         }
         
         //right
         if(Block(x+1,y)==0){
             colVertices.Add( new Vector3 (x +1 ,  y  , 1));
             colVertices.Add( new Vector3 (x +1 ,  y -1 , 1));
             colVertices.Add( new Vector3 (x +1 ,  y -1 , 0 ));
             colVertices.Add( new Vector3 (x +1 ,  y  , 0 ));
             
             ColliderTriangles();
             
             colCount++;
         }
         
     }
     
     void ColliderTriangles(){
         colTriangles.Add(colCount*4);
         colTriangles.Add((colCount*4)+1);
         colTriangles.Add((colCount*4)+3);
 
         colTriangles.Add((colCount*4)+1);
         colTriangles.Add((colCount*4)+2);
         colTriangles.Add((colCount*4)+3);
 
         colTriangles.Add((colCount*4)+0);
         colTriangles.Add((colCount*4)+3);
         colTriangles.Add((colCount*4)+7);
 
         colTriangles.Add((colCount*4)+0);
         colTriangles.Add((colCount*4)+4);
         colTriangles.Add((colCount*4)+7);
 
         colTriangles.Add((colCount*4)+4);
         colTriangles.Add((colCount*4)+6);
         colTriangles.Add((colCount*4)+7);
 
         colTriangles.Add((colCount*4)+4);
         colTriangles.Add((colCount*4)+5);
         colTriangles.Add((colCount*4)+6);
 
         colTriangles.Add((colCount*4)+0);
         colTriangles.Add((colCount*4)+4);
         colTriangles.Add((colCount*4)+1);
 
         colTriangles.Add((colCount*4)+4);
         colTriangles.Add((colCount*4)+5);
         colTriangles.Add((colCount*4)+1);
 
         colTriangles.Add((colCount*4)+5);
         colTriangles.Add((colCount*4)+6);
         colTriangles.Add((colCount*4)+2);
 
         colTriangles.Add((colCount*4)+5);
         colTriangles.Add((colCount*4)+1);
         colTriangles.Add((colCount*4)+2);
 
         colTriangles.Add((colCount*4)+6);
         colTriangles.Add((colCount*4)+3);
         colTriangles.Add((colCount*4)+2);
 
         colTriangles.Add((colCount*4)+6);
         colTriangles.Add((colCount*4)+3);
         colTriangles.Add((colCount*4)+7);
 
     }
     
     
     void GenSquare(int x, int y, Vector2 texture){
         
         newVertices.Add( new Vector3 (x  ,  y  , 0 ));
         newVertices.Add( new Vector3 (x + 1 ,  y  , 0 ));
         newVertices.Add( new Vector3 (x + 1 ,  y-1 , 0 ));
         newVertices.Add( new Vector3 (x  ,  y-1 , 0 ));
         
         newTriangles.Add(squareCount*4);
         newTriangles.Add((squareCount*4)+1);
         newTriangles.Add((squareCount*4)+3);
         newTriangles.Add((squareCount*4)+1);
         newTriangles.Add((squareCount*4)+2);
         newTriangles.Add((squareCount*4)+3);
         
         newUV.Add(new Vector2 (tUnit * texture.x, tUnit * texture.y + tUnit));
         newUV.Add(new Vector2 (tUnit * texture.x + tUnit, tUnit * texture.y + tUnit));
         newUV.Add(new Vector2 (tUnit * texture.x + tUnit, tUnit * texture.y));
         newUV.Add(new Vector2 (tUnit * texture.x, tUnit * texture.y));
         
         squareCount++;
         
     }
     
     void UpdateMesh () {
         mesh.Clear ();
         mesh.vertices = newVertices.ToArray();
         mesh.triangles = newTriangles.ToArray();
         mesh.uv = newUV.ToArray();
         mesh.Optimize ();
         mesh.RecalculateNormals ();
         
         newVertices.Clear();
         newTriangles.Clear();
         newUV.Clear();
         squareCount=0;
         
         Mesh newMesh = new Mesh();
         newMesh.vertices = colVertices.ToArray();
         newMesh.triangles = colTriangles.ToArray();
         col.sharedMesh= newMesh;
         
         colVertices.Clear();
         colTriangles.Clear();
         colCount=0;
     }
 }

Every time i run the game, it gives me the error: Actor::updateMassFromShapes: Compute mesh inertia tensor failed for one of the actor's mesh shapes! Please change mesh geometry or supply a tensor manually!

and:

Actor::updateMassFromShapes: Compute mesh inertia tensor failed for one of the actor's mesh shapes! Please change mesh geometry or supply a tensor manually! UnityEngine.MeshCollider:set_sharedMesh(Mesh) vehicle:UpdateMesh() (at Assets/scripts/vehicle.cs:269) vehicle:Start() (at Assets/scripts/vehicle.cs:35)

this is important since its the core feature of the game.

edit: I did try making the colliders for each box a rectangular prism, but it didn't fix the error:(