bool screenExists = false;
    Texture2D tex;
    string url = "www.e3.com/stream.png";

    private void Update()
    {
        if (Input.GetKeyDown(KeyCode.P) && !screenExists)
        {
            GameObject screen = new GameObject();
            screen.AddComponent<MeshFilter>();
            screen.AddComponent<MeshRenderer>();

            Mesh mesh = BuildQuad(0.32f, 0.18f);
            screen.GetComponent<MeshFilter>().mesh = mesh;

            tex = new Texture2D(640, 360, TextureFormat.DXT1, false);

            screenExists = true;
        }

        if (screenExists)
        {
            using (WWW www = new WWW(url))
            {
                yield return www;
                www.LoadImageIntoTexture(tex);
                GetComponent<Renderer>().material.mainTexture = tex;
            }
        }
    }

    private Mesh BuildQuad(float width, float height)
    {
        Mesh mesh = new Mesh();

        // Setup vertices
        Vector3[] newVertices = new Vector3[4];
        float halfHeight = height * 0.5f;
        float halfWidth = width * 0.5f;
        newVertices[0] = new Vector3(-halfWidth, -halfHeight, 0);
        newVertices[1] = new Vector3(-halfWidth, halfHeight, 0);
        newVertices[2] = new Vector3(halfWidth, -halfHeight, 0);
        newVertices[3] = new Vector3(halfWidth, halfHeight, 0);

        // Setup UVs
        Vector2[] newUVs = new Vector2[newVertices.Length];
        newUVs[0] = new Vector2(0, 0);
        newUVs[1] = new Vector2(0, 1);
        newUVs[2] = new Vector2(1, 0);
        newUVs[3] = new Vector2(1, 1);

        // Setup triangles
        int[] newTriangles = new int[] { 0, 1, 2, 3, 2, 1 };

        // Setup normals
        Vector3[] newNormals = new Vector3[newVertices.Length];
        for (int i = 0; i < newNormals.Length; i++)
        {
            newNormals[i] = Vector3.forward;
        }

        // Create quad
        mesh.vertices = newVertices;
        mesh.uv = newUVs;
        mesh.triangles = newTriangles;
        mesh.normals = newNormals;

        return mesh;
    }