function Start () {
    gameObject.AddComponent(Animation);
    gameObject.AddComponent(SkinnedMeshRenderer);
    var renderer : SkinnedMeshRenderer = GetComponent(SkinnedMeshRenderer);

    // Build basic mesh
    var mesh : Mesh = new Mesh ();
    mesh.vertices = [Vector3(-1, 0, 0), Vector3(1, 0, 0), Vector3(-1, 5, 0),
                     Vector3(1, 5, 0)];
    mesh.uv = [Vector2(0, 0), Vector2(1, 0), Vector2(0, 1), Vector2(1, 1)];
    mesh.triangles = [0, 1, 2, 1, 3, 2];
    mesh.RecalculateNormals();

    // Assign mesh to mesh filter & renderer
    renderer.material = new Material (Shader.Find("Diffuse"));

    // Assign bone weights to mesh
    // We use 2 bones. One for the lower vertices, one for the upper vertices.
    var weights : BoneWeight[] = new BoneWeight[4];

    weights[0].boneIndex0 = 0;
    weights[0].weight0 = 1;

    weights[1].boneIndex0 = 0;
    weights[1].weight0 = 1;

    weights[2].boneIndex0 = 1;
    weights[2].weight0 = 1;

    weights[3].boneIndex0 = 1;
    weights[3].weight0 = 1;

    mesh.boneWeights = weights;

    // Create Bone Transforms and Bind poses
    // One bone at the bottom and one at the top
    var bones : Transform[] = new Transform[2];
    var bindPoses : Matrix4x4[] = new Matrix4x4[2];

    bones[0] = new GameObject ("Lower").transform;
    bones[0].parent = transform;
    // Set the position relative to the parent
    bones[0].localRotation = Quaternion.identity;
    bones[0].localPosition = Vector3.zero;
    // The bind pose is bone's inverse transformation matrix
    // In this case the matrix we also make this matrix relative to the root
    // So that we can move the root game object around freely
    bindPoses[0] = bones[0].worldToLocalMatrix * transform.localToWorldMatrix;

    bones[1] = new GameObject ("Upper").transform;
    bones[1].parent = transform;
    // Set the position relative to the parent
    bones[1].localRotation = Quaternion.identity;
    bones[1].localPosition = Vector3 (0, 5, 0);
    // The bind pose is bone's inverse transformation matrix
    // In this case the matrix we also make this matrix relative to the root
    // So that we can move the root game object around freely
    bindPoses[1] = bones[1].worldToLocalMatrix * transform.localToWorldMatrix;

    mesh.bindposes = bindPoses;

    // Assign bones and bind poses
    renderer.bones = bones;
    renderer.sharedMesh = mesh;

    // Assign a simple waving animation to the bottom bone
    var curve : AnimationCurve = new AnimationCurve();
    curve.keys = [ new Keyframe (0, 0, 0, 0), new Keyframe (1, 3, 0, 0),
                   new Keyframe (2, 0.0, 0, 0) ];

    // Create the clip with the curve
    var clip : AnimationClip = new AnimationClip();
    clip.SetCurve("Lower", Transform, "m_LocalPosition.z", curve);

    // Add and play the clip
    animation.AddClip(clip, "test");
    animation.Play("test");
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Start() {
        gameObject.AddComponent<Animation>();
        gameObject.AddComponent<SkinnedMeshRenderer>();
        SkinnedMeshRenderer renderer = GetComponent<SkinnedMeshRenderer>();
        Mesh mesh = new Mesh();
        mesh.vertices = new Vector3[] {new Vector3(-1, 0, 0), new Vector3(1, 0, 0), new Vector3(-1, 5, 0), new Vector3(1, 5, 0)};
        mesh.uv = new Vector2[] {new Vector2(0, 0), new Vector2(1, 0), new Vector2(0, 1), new Vector2(1, 1)};
        mesh.triangles = new int[] {0, 1, 2, 1, 3, 2};
        mesh.RecalculateNormals();
        renderer.material = new Material(Shader.Find("Diffuse"));
        BoneWeight[] weights = new BoneWeight[4];
        weights[0].boneIndex0 = 0;
        weights[0].weight0 = 1;
        weights[1].boneIndex0 = 0;
        weights[1].weight0 = 1;
        weights[2].boneIndex0 = 1;
        weights[2].weight0 = 1;
        weights[3].boneIndex0 = 1;
        weights[3].weight0 = 1;
        mesh.boneWeights = weights;
        Transform[] bones = new Transform[2];
        Matrix4x4[] bindPoses = new Matrix4x4[2];
        bones[0] = new GameObject("Lower").transform;
        bones[0].parent = transform;
        bones[0].localRotation = Quaternion.identity;
        bones[0].localPosition = Vector3.zero;
        bindPoses[0] = bones[0].worldToLocalMatrix * transform.localToWorldMatrix;
        bones[1] = new GameObject("Upper").transform;
        bones[1].parent = transform;
        bones[1].localRotation = Quaternion.identity;
        bones[1].localPosition = new Vector3(0, 5, 0);
        bindPoses[1] = bones[1].worldToLocalMatrix * transform.localToWorldMatrix;
        mesh.bindposes = bindPoses;
        renderer.bones = bones;
        renderer.sharedMesh = mesh;
        AnimationCurve curve = new AnimationCurve();
        curve.keys = new Keyframe[] {new Keyframe(0, 0, 0, 0), new Keyframe(1, 3, 0, 0), new Keyframe(2, 0.0F, 0, 0)};
        AnimationClip clip = new AnimationClip();
        clip.SetCurve("Lower", typeof(Transform), "m_LocalPosition.z", curve);
        animation.AddClip(clip, "test");
        animation.Play("test");
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Start():
        gameObject.AddComponent[of Animation]()
        gameObject.AddComponent[of SkinnedMeshRenderer]()
        renderer as SkinnedMeshRenderer = GetComponent[of SkinnedMeshRenderer]()
        mesh as Mesh = Mesh()
        mesh.vertices = (Vector3(-1, 0, 0), Vector3(1, 0, 0), Vector3(-1, 5, 0), Vector3(1, 5, 0))
        mesh.uv = (Vector2(0, 0), Vector2(1, 0), Vector2(0, 1), Vector2(1, 1))
        mesh.triangles = (0, 1, 2, 1, 3, 2)
        mesh.RecalculateNormals()
        renderer.material = Material(Shader.Find('Diffuse'))
        weights as (BoneWeight) = array[of BoneWeight](4)
        weights[0].boneIndex0 = 0
        weights[0].weight0 = 1
        weights[1].boneIndex0 = 0
        weights[1].weight0 = 1
        weights[2].boneIndex0 = 1
        weights[2].weight0 = 1
        weights[3].boneIndex0 = 1
        weights[3].weight0 = 1
        mesh.boneWeights = weights
        bones as (Transform) = array[of Transform](2)
        bindPoses as (Matrix4x4) = array[of Matrix4x4](2)
        bones[0] = GameObject('Lower').transform
        bones[0].parent = transform
        bones[0].localRotation = Quaternion.identity
        bones[0].localPosition = Vector3.zero
        bindPoses[0] = (bones[0].worldToLocalMatrix * transform.localToWorldMatrix)
        bones[1] = GameObject('Upper').transform
        bones[1].parent = transform
        bones[1].localRotation = Quaternion.identity
        bones[1].localPosition = Vector3(0, 5, 0)
        bindPoses[1] = (bones[1].worldToLocalMatrix * transform.localToWorldMatrix)
        mesh.bindposes = bindPoses
        renderer.bones = bones
        renderer.sharedMesh = mesh
        curve as AnimationCurve = AnimationCurve()
        curve.keys = (Keyframe(0, 0, 0, 0), Keyframe(1, 3, 0, 0), Keyframe(2, 0.0F, 0, 0))
        clip as AnimationClip = AnimationClip()
        clip.SetCurve('Lower', Transform, 'm_LocalPosition.z', curve)
        animation.AddClip(clip, 'test')
        animation.Play('test')