Drawing 3D polygon on unity 3d - unity3d

Question

I am trying out unity for a project that i am on.
I am attempting to draw 3D polygon from a set of coordinate that I have.
So what i am doing now is to build a row of cube btw the two points. I plan to build these points into either a solid shape or just "walls" to form a room.
However, it doesn't seem to work as expected. Please advise.
drawCube( Vector3(10,0,14),Vector3(70,0,14));
drawCube( Vector3(90,0,14),Vector3(60,87,45));
function drawCube(v1,v2) {
pA = v1;
pB = v2;
var plane : GameObject = GameObject.CreatePrimitive(PrimitiveType.Cube);
var between:Vector3 = pB - pA;
var distance:float = between.magnitude;
plane.transform.localScale.x = distance;
plane.transform.localScale.y=10;
plane.transform.position = pA + (between / 2.0);
plane.transform.LookAt(pB);
}
updated: I have also tried using a mesh but all i got was the below image. What am i doing wrong?
I am trying to achieve something like this

Answer 1

You could make primitives and manipulate them but that would limit you very much if you needed to scale or change your requirements in the future. I would recommend using a procedural mesh to create the geometry you need as you need it. The basics aren't too hard, it's just a matter of constructing the Mesh object from it's base components given some vertices. Here's an example of constructing a 3d quadrilateral:
using UnityEngine;
using System.Collections.Generic;
public class SquareMaker : MonoBehaviour {
public List<Vector3> points;
void Start()
{
GameObject threeDSquare = new GameObject("3DSquare");
threeDSquare.AddComponent<MeshRenderer>();
threeDSquare.AddComponent<MeshFilter>();
threeDSquare.GetComponent<MeshFilter>().mesh = CreateMesh(points);
}
private Mesh CreateMesh(List<Vector3> points)
{
List<int> tris = new List<int>(); // Every 3 ints represents a triangle
List<Vector2> uvs = new List<Vector2>(); // Vertex position in 0-1 UV space
/* 4 points in the list for the square made of two triangles:
0 *--* 1
| /|
|/ |
3 *--* 2
*/
tris.Add(1);
tris.Add(2);
tris.Add(3);
tris.Add(3);
tris.Add(0);
tris.Add(1);
// uvs determine vert (point) coordinates in uv space
uvs.Add(new Vector2(0f, 1f));
uvs.Add(new Vector2(1f, 1f));
uvs.Add(new Vector2(1f, 0f));
uvs.Add(new Vector2(0f, 0f));
Mesh mesh = new Mesh();
mesh.vertices = points.ToArray();
mesh.uv = uvs.ToArray();
mesh.triangles = tris.ToArray();
mesh.RecalculateNormals();
return mesh;
}
}