Half-Pipe

var newVertices : Vector3[];
var newUV : Vector2[];
var newTriangles : int[];
var verts : Array;
var UVs : Array;
var triangles : Array;
var a : float;
var curvature : int; //must be even
var depth : int;
private var toggle : boolean;
private var b : float;

function Start () {
    toggle = true;
    verts = new Array();
    UVs = new Array();
    triangles = new Array();

    var mesh : Mesh = new Mesh ();
    GetComponent.<MeshFilter>().mesh = mesh;
    for (var i =0; i< curvature; i++) {
        b = i* 1.0/curvature;
        verts.Add(Vector3(b, a*b*b, 0));
        verts.Add(Vector3(b, a*b*b, depth));
        if (toggle) {
            UVs.Add (Vector2(0,0));
            UVs.Add (Vector2(1,0));
            UVs.Add (Vector2(0,1));
            UVs.Add (Vector2(1,1));
            triangles.Add (i*2);
            triangles.Add (i*2+1);
            triangles.Add (i*2+2);

            triangles.Add (i*2+2);
            triangles.Add (i*2+1);
            triangles.Add (i*2+3);

            if (i < (curvature-2)) {

                triangles.Add (i*2+2);
                triangles.Add (i*2+3);
                triangles.Add (i*2+5);

                triangles.Add (i*2+2);
                triangles.Add (i*2+5);
                triangles.Add (i*2+4);

}}      toggle = !toggle;
}   newVertices = verts.ToBuiltin(Vector3);
    newUV = UVs.ToBuiltin(Vector2);
    newTriangles = triangles.ToBuiltin(int);
    mesh.vertices = newVertices;
    mesh.uv = newUV;
    mesh.triangles = newTriangles;
}

//y = ax^2