Outside of bounds error

Unity Engine
1

I copied some numbers from a brackeys tutorial (too lazy to calculate them myself :wink: ) but I get a outside of bounds error at line 21. I dont understand why it should be declared correctly.

public void GenerateChunkMesh(int widthInUnits, float[,] noise)
    {
        verts = new Vector3[(widthInUnits + 1) * (widthInUnits + 1)];
        tris = new int[widthInUnits * widthInUnits * 6];

        for(int y = 0, i = 0; y < widthInUnits; y++)
        {
            for(int x = 0; x < widthInUnits; x++)
            {
                verts[i] = new Vector3(transform.position.x + x, noise[x, y], transform.position.y + y);
                i++;
            }
        }

        int vert = 0;
        int triangles = 0;
        for (int j = 0; j < verts.Length - 1; j++)
        {
            for (int i = 0; i < verts.Length - 1; i++)
            {
                tris[triangles + 0] = vert + 0;
                tris[triangles + 1] = vert + widthInUnits + 2;
                tris[triangles + 2] = vert + 1;
                tris[triangles + 3] = vert + 1;
                tris[triangles + 4] = vert + widthInUnits + 1;
                tris[triangles + 5] = vert + widthInUnits + 2;

                triangles += 6;
                vert++;
            }
            vert++;
        }
    }

Surely I am overseeing something obvious here but I dont get it.

2

Line 17 and line 19 termination comparison quantities are incorrect.

Line 3 makes the verts array out of the square of (widthInUnits+1)

Line 4 makes the tris array out of a comparably-squared quantity, expanded by 6 for 2 tris per quad.

So a 9x9 width would be 100 verts, and 81 * 6 tris.

Then you are iterating 99 verts within another loop iterating 99 verts, so that’s why you are spilling beyond the tris array.

Most likely you want lines 17 and 19 to both continue when the index value is below widthInUnits

for (int j = 0; j < widthInUnits; j++)