Problem with Procedural Mesh Generation

Questions & Answers
1

Hi All,

I am currently having an issue with mesh generation, I followed brackeys tutorial on Mesh Generation for procedural maps and seem to be having an issue that I cannot solve.

The problem I am having is, it isn’t generating a grid with Perlin noise. It is instead generating what is being shown in the image below. It is just meant to be a grid like mesh.

Here is an image:
![alt text][1]

Image 2:
[154774-uhoh2.png*|154774]

Here is my code:

using UnityEngine;

public class MeshGenerator : MonoBehaviour
{
    public int xSize = 20;
    public int zSize = 20;

    Mesh mesh;
    Vector3[] vertices;
    int[] triangles;

    void Start()
    {
        mesh = new Mesh();
        GetComponent<MeshFilter>().mesh = mesh;

        CreateShape();
        UpdateMesh();
    }

    private void CreateShape()
    {
        vertices = new Vector3[(xSize + 1) * (zSize + 1)];

        for (int i = 0, z = 0; z <= zSize; i++, z++)
        {
            for (int x = 0; x <= xSize; x++)
            {
                var y = Mathf.PerlinNoise(x * .3f, z * .3f) * 2f;
                vertices *= new Vector3(x, y, z);*

}
}

triangles = new int[xSize * zSize * 6];
var vert = 0;
var tris = 0;

for (var z = 0; z < zSize; z++)
{
for (var x = 0; x < xSize; x++)
{
triangles[vert + 0] = vert + 0;
triangles[vert + 1] = vert + xSize + 1;
triangles[vert + 2] = vert + 1;
triangles[vert + 3] = vert + 1;
triangles[vert + 4] = vert + xSize + 1;
triangles[vert + 5] = vert + xSize + 2;

vert++;
tris += 6;
}

vert++;
}
}

private void UpdateMesh()
{
mesh.Clear();

mesh.vertices = vertices;
mesh.triangles = triangles;

mesh.RecalculateNormals();
}
}

Regards,
Migo
[1]: /storage/temp/154736-uhoh.png
*

2

You have two problems:

  1. Your not incrementing i to match the full number of vertices your creating in the vertex generation loops - you increment i in the outer loop. But you should increase the value of I for every vertex you create, not for each row. So increment i in the inner loop, not as part of the loop declaration.

  2. you need to increase the triangle array index by ‘tris’ not ‘vert’ (should be triangles[tris+ 0] and so on)