Example of a cone mesh creator for Unity.

using UnityEngine; using System.Collections;

[RequireComponent (typeof (MeshFilter))] public class Corn : MonoBehaviour {

public int subdivisions = 10;
public float radius = 1f;
public float height = 2f;

void Start () {
	GetComponent<MeshFilter>().sharedMesh = Create(subdivisions, radius, height);
}

void Update () {
}

Mesh Create (int subdivisions, float radius, float height) {
	Mesh mesh = new Mesh();

	Vector3[] vertices = new Vector3[subdivisions + 2];
	Vector2[] uv = new Vector2[vertices.Length];
	int[] triangles = new int[(subdivisions * 2) * 3];

	vertices[0] = Vector3.zero;
	uv[0] = new Vector2(0.5f, 0f);
	for(int i = 0, n = subdivisions - 1; i < subdivisions; i++) {
		float ratio = (float)i / n;
		float r = ratio * (Mathf.PI * 2f);
		float x = Mathf.Cos(r) * radius;
		float z = Mathf.Sin(r) * radius;
		vertices[i + 1] = new Vector3(x, 0f, z);

		Debug.Log (ratio);
		uv[i + 1] = new Vector2(ratio, 0f);
	}
	vertices[subdivisions + 1] = new Vector3(0f, height, 0f);
	uv[subdivisions + 1] = new Vector2(0.5f, 1f);

	// construct bottom

	for(int i = 0, n = subdivisions - 1; i < n; i++) {
		int offset = i * 3;
		triangles[offset] = 0; 
		triangles[offset + 1] = i + 1; 
		triangles[offset + 2] = i + 2; 
	}

	// construct sides

	int bottomOffset = subdivisions * 3;
	for(int i = 0, n = subdivisions - 1; i < n; i++) {
		int offset = i * 3 + bottomOffset;
		triangles[offset] = i + 1; 
		triangles[offset + 1] = subdivisions + 1; 
		triangles[offset + 2] = i + 2; 
	}

	mesh.vertices = vertices;
	mesh.uv = uv;
	mesh.triangles = triangles;
	mesh.RecalculateBounds();
	mesh.RecalculateNormals();

	return mesh;
}

}