MMD4Mecanimの表情制御をMMD for Unityと同じやり方（制御用GameObjectのZ位置を動かす）で出来るようにするスクリプト。

MMD4MecanimExpressionCompatibility.cs

using UnityEngine;
using System.Collections;

// Script to make MMD4Mecanim's expressions controllable like MMDforUnity's expressions.
// Move the Z localPosition of an expression GameObject from 0.0-1.0 to control that expression.

/* 
 * Instructions:
 * 1. Copy the "Expression" GameObject (and its children) from inside a MMDforUnity-imported model to inside a MMD4Mecanim-imported model.
 * 2. Select all the individual GameObjects for the expressions inside the "Expression" GameObject.
 * 3. Remove the MMDSkinsScript script from all of them.
 * 4. Apply the MMD4MecanimExpressionCompatibility script (this script) instead to all of them.
 * 5. Run the game, and try moving the Z axis of the individual expression GameObjects.
 * 
 * 使い方：
 * 1. MMDforUnityでインポートしたモデルのGameObject内から、MMD4MecanimでインポートしたモデルのGameObject内へ、"Expression" GameObjectおよびその中身をコピー
 * 2. "Expression" GameObjectの中に入っている個別の表情用GameObjectすべてをまとめて選択
 * 3. それらすべてにアタッチされているMMDSkinsScriptスクリプトを削除
 * 4. それらすべてにMMD4MecanimExpressionCompatibilityスクリプト（このスクリプト）を代わりにアタッチ
 * 5. ゲームを実行し、表情用GameObjectのZ軸を動かしてみる
 */
// TODO: Autogenerate the expression GameObjects in advance using Editor Scripts.

public class MMD4MecanimExpressionCompatibility : MonoBehaviour {
	private MMD4MecanimExpression.Expression targetExpression = null;
	private bool initialized = false;
	
	// Initialization will run at first frame Update (after MMD4MecanimExpression's initialization and list population is done)
	void InitExpression () {
		initialized = true;
		
		MMD4MecanimExpression expressionManager = transform.parent.parent.GetComponent<MMD4MecanimExpression>();
		if (expressionManager == null) {
			return;
		}
		foreach (MMD4MecanimExpression.Expression activeExpression in expressionManager.expressions) {
			if (gameObject.name == activeExpression.name) {
				targetExpression = activeExpression;
				break;
			}
		}
	}
	
	// Update is called once per frame
	void Update () {
		if (!initialized) {
			InitExpression();
		}
		
		if (targetExpression == null) {
			return;
		}
		targetExpression.weight = transform.localPosition.z;
	}
}