No Mesh is displayed

Unity Engine
1

Hello, i am trying to create my own terrain, i am trying to achieve this by doing a vector3 array for all the coordinate points of the terrain and then building a mesh from that array. i use 1 script and a custom class with 3 scripts. The problem is that the mesh currently doesn’t want to display on the object using this script

using UnityEngine;
using System.Collections;

public class CreateTerrain : MonoBehaviour {

   public Vector3[] TerrainArray;
   public Vector2[] TerrainUVs;

   // Use this for initialization
   void Start ()
   {
     Mesh mesh = gameObject.AddComponent<MeshFilter>().mesh;
     gameObject.AddComponent<MeshRenderer>();

     TerrainArray = STerrain.CreateField(20,20);
     TerrainUVs = STerrain.CreateUVs(TerrainArray,20,20);

     mesh = STerrain.CreateMesh(TerrainArray,TerrainUVs,20,20);

     mesh.RecalculateBounds();
     mesh.RecalculateNormals();
   }
}

This is the custom class required for the script to function

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

public class STerrain : MonoBehaviour
{
   public static Vector3[] CreateField(int width,int length)
   {
     List<Vector3> List3D = new List<Vector3>();

     for( int x = 0 ; x < width ; x++ )
     {
       for( int z = 0 ; z < length ; z++ )
       {
         List3D.Add ( new Vector3( x, 0, z ) );
       }
     }

     return List3D.ToArray();
   }

   public static Vector2[] CreateUVs( Vector3[] field, int width, int length)
   {

     Vector2[] uvs = new Vector2[width * length];

     for( int x = 0 ; x < width ; x++ )
     {
       for( int z = 0 ; z < length ; z++ )
       {
         uvs[( x * width ) + z].x = field[( x * width ) + z ].x / width;
         uvs[( x * width ) + z].y = field[( x * width ) + z ].z / length;
       }
     }
     
     return uvs;
   }

   public static Mesh CreateMesh( Vector3[] field, Vector2[] uvs, int width, int length)
   {   
     Mesh mesh = new Mesh();

     int index;
   
     Vector3 point1;
     Vector3 point2;
     Vector3 point3;
     Vector3 point4;

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

     for( int x = 0 ; x < width ; x++ )
     {
       for( int z = 0 ; z < length ; z++ )
       {
         index = ( x * width ) + z;

         while(true)
         {
           point1 =  field[index];

           try
           {
             point2 = field[index + 1];
           }
           catch(System.IndexOutOfRangeException e)
           {
             break;
           }
           try
           {
             point3 = field[index + width];
           }
           catch(System.IndexOutOfRangeException e)
           {
             break;
           }
           try
           {
             point4 = field[index + width + 1];
           }
           catch(System.IndexOutOfRangeException e)
           {
             break;
           }

           tris.Add(index);
           tris.Add(index + 1);
           tris.Add(index + width);

           tris.Add(index + width);
           tris.Add(index + width + 1);
           tris.Add(index);

           break;
         }
       }
     }

     mesh.vertices = field;
     mesh.uv = uvs;
     mesh.triangles = tris.ToArray();
     
     mesh.RecalculateBounds();
     mesh.RecalculateNormals();

     return mesh;

   }
}

Honestly i’m really bumed by this because i thought i finally understood how classes in c# worked and now it seems i am on square one again :frowning:

2

What error does it give you?

3

Warning: Untested code!

using UnityEngine;
using System.Collections;
public class CreateTerrain : MonoBehaviour {
  public Vector3[] TerrainArray;
  public Vector2[] TerrainUVs;
  // Use this for initialization
  void Start ()
  {
  TerrainArray = STerrain.CreateField(20,20);
  TerrainUVs = STerrain.CreateUVs(TerrainArray,20,20);
  Mesh mesh = STerrain.CreateMesh(TerrainArray,TerrainUVs,20,20);

  MeshFilter meshFilter = gameObject.AddComponent<MeshFilter>();
  gameObject.AddComponent<MeshRenderer>();
  meshFilter.mesh = mesh;
  mesh.RecalculateBounds();
  mesh.RecalculateNormals();
  }
}

The important change is that the mesh that was generated is now assigned to the mesh filter.

1 Like
4

BenZed, i recieve no errors at all, the only problem is the mesh doesn’t display when the game is run.

Dantus, thank you for the code, it seems to work, but i fail too understand why, don’t i do that in my code too ?

5

This here is the key:

meshFilter.mesh = mesh;

You aren’t doing that in your code. What you do is, you query the mesh from the mesh filter, then you replace the reference with the one that is generated, but you don’t assign it to the mesh filter. Only if the mesh is assigned to the mesh filter, it will be shown.

3 Likes
6

Oh, i see! Thank you so much!