动画框架：SceneManager

SceneManager：

1.动画对象的管理：

AnimationList mAnimationsList;
AnimationStateSet mAnimationStates;

Animation* SceneManager::createAnimation(const String& name, Real length)
{
	OGRE_LOCK_MUTEX(mAnimationsListMutex)
    if (mAnimationsList.find(name) != mAnimationsList.end())
    {
        OGRE_EXCEPT(
            Exception::ERR_DUPLICATE_ITEM,
            "An animation with the name " + name + " already exists",
            "SceneManager::createAnimation" );
    }
    Animation* pAnim = OGRE_NEW Animation(name, length);
    mAnimationsList[name] = pAnim;
    return pAnim;
}

AnimationState* SceneManager::createAnimationState(const String& animName)
{
        Animation* anim = getAnimation(animName);//如果不存在就会抛异常
	return mAnimationStates.createAnimationState(animName, 0, anim->getLength());
}

在SceneManager里面使用Animation时会把Animation保存在mAnimationsList里面，AnimationState保存在mAnimationStates里面，他们通过animName来保持一一对应。生命周期：Animation创建-->AnimationState创建-->AnimationState销毁-->Animation销毁。如果不是按照这种顺序会报异常。

 

2.动画播放：

void SceneManager::_applySceneAnimations(void)
{
	// manual lock over states (extended duration required)
	OGRE_LOCK_MUTEX(mAnimationStates.OGRE_AUTO_MUTEX_NAME)

	// Iterate twice, once to reset, once to apply, to allow blending
    ConstEnabledAnimationStateIterator stateIt = mAnimationStates.getEnabledAnimationStateIterator();

    while (stateIt.hasMoreElements())
    {
        const AnimationState* state = stateIt.getNext();
        Animation* anim = getAnimation(state->getAnimationName());

        // Reset any nodes involved
        Animation::NodeTrackIterator nodeTrackIt = anim->getNodeTrackIterator();
        while(nodeTrackIt.hasMoreElements())
        {
            Node* nd = nodeTrackIt.getNext()->getAssociatedNode();
			if (nd)
				nd->resetToInitialState();
        }

        Animation::NumericTrackIterator numTrackIt = anim->getNumericTrackIterator();
        while(numTrackIt.hasMoreElements())
        {
            const AnimableValuePtr& animPtr = numTrackIt.getNext()->getAssociatedAnimable();
			if (!animPtr.isNull())
				animPtr->resetToBaseValue();
        }
    }

	// this should allow blended animations
	stateIt = mAnimationStates.getEnabledAnimationStateIterator();
	while (stateIt.hasMoreElements())
	{
		const AnimationState* state = stateIt.getNext();
		Animation* anim = getAnimation(state->getAnimationName());
		// Apply the animation
		anim->apply(state->getTimePosition(), state->getWeight());
	}
}

 遍历所有Enabled为true的动画状态，调用node的resetToInitialState()和AnimableValue的resetToBaseValue()方法，分辨对节点动画和数组动画进行reset，最后调用Animation的apply方法进行播放动画。