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Question by Tageos · Jul 26, 2016 at 10:15 PM · c#meshesprocedural meshprocedural-generationprocedural-terrain

Mesh generation issue (C#)

At the start of my game i want to create a chunk of terrain:

     void StartChunk ()
     {
         refPoints = new float[chunkLength+1]; 
         blocks = new GameObject[chunkLength];
 
         for (int i = 0; i < refPoints.Length; i++)
         {
             refPoints [i] = Random.Range (y1Min, y1Max);
         }
 
         for (int i = 0; i < blocks.Length; i++) 
         {
             GenerateMeshes (i);
         }
     }    

The method GenerateMeshes looks like this:

 void GenerateMeshes (int i)
     {            
         blocks [i] = Instantiate (block, new Vector3 (0, 0, 0), transform.rotation) as GameObject;
         MeshFilter mf = blocks [i].GetComponent<MeshFilter> ();
         Mesh mesh = new Mesh ();
         mf.mesh = mesh;
 
         //Vertices
         vertices = new Vector3[4] {
             new Vector3 (i-9, -6,0),
             new Vector3 (i-8, -6,0),
             new Vector3 (i-9, refPoints[i],0),
             new Vector3 (i-8, refPoints[i+1],0),
         };
 
         //Triangles
         int[] tri = new int[6];
 
         tri [0] = 0;
         tri [1] = 1;
         tri [2] = 2;
 
         tri [3] = 2;
         tri [4] = 3;
         tri [5] = 1;
 
         //UV's
         Vector2[] uv = new Vector2[4];
 
         uv [0] = new Vector2 (0, 0);
         uv [1] = new Vector2 (1, 0);
         uv [2] = new Vector2 (0, 1);
         uv [3] = new Vector2 (1, 1);
 
         mesh.vertices = vertices;
         mesh.triangles = tri;
         mesh.uv = uv;
     }

When the method StartChunk is called i get this result:

alt text

But what i want to achieve is something like this:

alt text

I think i have to modify my GenerateMeshes method but i really cant figure out what to do, any help is appreciated. Thanks.

fek2.png (5.3 kB)
fek.png (9.3 kB)
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avatar image ScaniX · Jul 26, 2016 at 10:29 PM 0
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Not sure without testing it, but the order of the vertices in your tri defines the direction of the normals, so try this one for the first triangle:

      tri [0] = 0;
      tri [1] = 2;
      tri [2] = 1;
avatar image Tageos ScaniX · Jul 27, 2016 at 08:42 AM 0
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Thanks, that solved my problem! Please post it as an answer and ill accept.

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Answer by ScaniX · Jul 27, 2016 at 08:56 AM

The order of the vertices in your tri defines the direction of the normals, so try this one for the first triangle:

      tri [0] = 0;
      tri [1] = 2;
      tri [2] = 1;
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