準備

Sphereを作る

Rigidbodyをつける
Mass: 0.001
Use Gravity: ON
position > Y: 0

Sphere ColliderにPhysics Materialをつける

名前: Bouncy
Bounciness: 0.9
Friction Combine: Minimum
Bounce Combine: Maximum

Cubeを作る (Prefabにするもの)

enemyという名前にする
Rigidbodyをつける
Mass: 1
Use Gravity: OFF (Sphereとぶつかった時に止まらないように)
Is Kinematic: ON
Prefabにする
deleteする

Planeを作る

position > Y: -0.5

code

Main Cameraに以下の.csを関連づける

GenerateLR.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic; // for List<>

public class GenerateLR : MonoBehaviour {

	public GameObject enemyPrefab;
	public Rigidbody PlayerRig;
	private int score = 0;

	// line draw
	private GameObject lineGroup; // for grouping
	private List<Vector2> my2DPoint; // for 2D data
	private float xstep = 0.2f;

	private float accumTime_sec = 0.0f;
	private float enemyTime_sec = 0.0f;
	private GameObject enemyObjPri = null;
	private bool gameEnd = false;

	void DrawLine(List<Vector2> my2DVec, int startPos) {
		List<Vector3> myPoint = new List<Vector3>();
		for(int pos = startPos; pos <= startPos+1; pos++) {
			myPoint.Add(new Vector3(my2DVec[pos].x, my2DVec[pos].y, 0.0f));
		}

		GameObject newLine = new GameObject ("Line" + startPos.ToString() );
		LineRenderer lRend = newLine.AddComponent<LineRenderer> ();
		lRend.SetVertexCount(2);
		lRend.SetWidth (0.1f, 0.1f);
		lRend.SetPosition (0, myPoint[0]); // start
		lRend.SetPosition (1, myPoint[1]); // end

		newLine.transform.parent = lineGroup.transform; // for grouping
	}

	void initData() {
		my2DPoint = new List<Vector2> ();
		for (int idx=0; idx<100; idx++) {
			my2DPoint.Add (new Vector2 (-10 + xstep * idx, Random.Range(0.0f, 5.0f)));
		}
	}

	void updateData() {
		my2DPoint.RemoveAt (0); // remove 1st point

		for (int idx=0; idx < my2DPoint.Count; idx++) { // shift x position 
			Vector2 vec = new Vector2(my2DPoint[idx].x - xstep, my2DPoint[idx].y);
			my2DPoint[idx] = vec;
		}
		if (enemyObjPri != null) {
			Vector3 pos = enemyObjPri.transform.position;
			Vector3 vec = new Vector3(pos.x - xstep, pos.y, pos.z);
			if (vec.x < -5.0) {
				Destroy(enemyObjPri);
			} else {
				enemyObjPri.transform.position = vec;
			}
		}

		int last = my2DPoint.Count;
		float ypos = PlayerRig.transform.position.y / 4.0f; // to [0.0, 5.0]
		if (ypos < -1.0f) {
			gameEnd = true;
		}
		my2DPoint.Add (new Vector2 (-10 + xstep * last, ypos));
	}

	void Start () {
		initData ();
	}
		
	void OnGUI() {
		Rect rect1 = new Rect (10, 10, 100, 30);
		GUI.TextField (rect1, "score:" + score.ToString());
		if (gameEnd) {
			Rect rect2 = new Rect (10, 40, 100, 30);
			GUI.TextField (rect2, "GAME END");
		}
	}

	void CheckScore() {
		if (enemyObjPri == null) {
			return;
		}
		Vector3 player1 = PlayerRig.transform.position;
		Vector3 enemy1 = enemyObjPri.transform.position;

		if (Mathf.Abs (player1.x - enemy1.x) < 0.5f) {
			float diff = Mathf.Abs (player1.y - enemy1.y);
			score += (int)(100.0f / diff );
		}
	}
	
	void Update () {
		if (gameEnd) {
			return;
		}

		if (Input.GetKey (KeyCode.UpArrow)) {
			PlayerRig.AddForce(Vector3.up * 0.05f);
		}

		enemyTime_sec += Time.deltaTime;
		if (accumTime_sec < 0.3f) { // each 300 msec
			accumTime_sec += Time.deltaTime;
			return;
		}
		accumTime_sec = 0.0f;

		if (enemyTime_sec > 5.0f && enemyObjPri == null) {
			enemyTime_sec = 0.0f;
			enemyObjPri = Instantiate(enemyPrefab, new Vector3(5.0f, 0.0f, 0.0f), Quaternion.identity) as GameObject;
		}

		CheckScore ();
		updateData ();

		if (lineGroup != null) {
			Destroy(lineGroup);
		}
		lineGroup = new GameObject ("LineGroup");
		for (int idx=0; idx < my2DPoint.Count - 1; idx++) {
			DrawLine (my2DPoint, /* startPos=*/idx);
		}
	}
}

Main Camera > Generate LR (Script)

Enemy Prefab : enemyを関連付ける
Player Rig : Sphere(Rigidbody)を関連付ける

遊び方

カーソルキー上: Sphereを上昇させる。
定期的にCubeが右から来る。Cubeに跳ね飛ばされないようにSphereを上昇させる。
Cubeに近い時にCubeとの高さが近いとScoreが大きく加算される。
跳ね飛ばされてPlaneから落ちたらゲームエンド。

公開　

以下で実行できます。(Unity web playerが必要です)
http://unitygameuploader.jpn.org/game/5754.html