Creating a 3D Plane Mesh Without a Filled Center

[Ben-BearFish]

I was wondering if anyone knew how to create a 3D mesh plane in Unity that doesn’t not have a filled center, much like the UI Image component that doesn’t have a center, but edges only?

Here is the 2D Unity GUI equivalent of what I’m trying to do with a 3D plane:

[cjdev]

Without really knowing what it is you’re trying to do it’s a bit difficult to give you a definitive answer, but the basics of procedural mesh generation should get you started. Here is an example that creates a plane of 3x3 squares with the middle square missing:

List<Vector3> verts = new List<Vector3>();
List<int> tris = new List<int>();

for (int i = 0; i < 4; i++) //Creates a grid of squares 3 X 3 with a hole
{
	for (int j = 0; j < 4; j++)
	{
		verts.Add(new Vector3(i, 0.5f, j)); //Adds each new vertex in the plane
		//Skip if four vertices cant be connected with tris
		if (i == 0 || j == 0 || (i == 2 && j == 2)) continue;
        //Adds the index of the three vertices in order to make up each of the two tris
		tris.Add(4 * i + j); //Top right
		tris.Add(4 * i + j - 1); //Bottom right
		tris.Add(4 * (i - 1) + j - 1); //Bottom left - First triangle
		tris.Add(4 * (i - 1) + j - 1); //Bottom left 
		tris.Add(4 * (i - 1) + j); //Top left
		tris.Add(4 * i + j); //Top right - Second triangle
	}
}

Vector2[] uvs = new Vector2[verts.Count];
for (var i = 0; i < uvs.Length; i++) //Give UV coords X,Z world coords
	uvs <em>= new Vector2(verts_.x, verts*.z);*_</em>

GameObject plane = new GameObject(“ProcPlane”); //Create GO and add necessary components
plane.AddComponent();
plane.AddComponent();
Mesh procMesh = new Mesh();
procMesh.vertices = verts.ToArray(); //Assign verts, uvs, and tris to the mesh
procMesh.uv = uvs;
procMesh.triangles = tris.ToArray();
procMesh.RecalculateNormals(); //Determines which way the triangles are facing
plane.GetComponent().mesh = procMesh; //Assign Mesh object to MeshFilter