行走动画无法正常显示

[Fanby1]

Describe the bug | Bug描述
这个bug是我在完成作业三的状态机时发现的，问题出现在我按住w键不动之后只能正确行走启动动画。到了第二个循环之后只有静止不动的idle动画。

Steps to reproduce | 如何复现
Steps to reproduce the behavior:

1. 按照作业文件中的提示写好全部状态机
2. 启动动画模式按下w
3. 发现问题

Expected behavior | 预期行为
A clear and concise description of what you expected to happen.
能够正确实现动画的循环播放

Actual behavior | 实际行为
A clear and concise description of what actually happened.
只播放了一遍动画

Screenshots/Logs | 截图/日志
If applicable, add screenshots and/or a video to help explain your problem.
我在update函数的switch语句中进行状态切换时加入了输出状态的语句，并在函数结尾添加了一个检查is_clip_finish的if语句：

bool AnimationFSM::update(const json11::Json::object& signals)
    {
        States last_state     = m_state;
        bool   is_clip_finish = tryGetBool(signals, "clip_finish", false);
        bool   is_jumping     = tryGetBool(signals, "jumping", false);
        float  speed          = tryGetFloat(signals, "speed", 0);
        bool   is_moving      = speed > 0.01f;
        bool   start_walk_end = false;

        switch (m_state)
        {
            case States::_idle:
                /**** [0] ****/
                if(is_jumping){
                    m_state = States::_jump_start_from_idle;
                }else if(is_moving){
                   m_state = States::_walk_start;
                   std::cout << "walk start" << std::endl;
                }
                break;
            case States::_walk_start:
                /**** [1] ****/
                if(is_clip_finish){
                    m_state = States::_walk_run;
                    std::cout << "walk run" << std::endl;
                }
                break;
            case States::_walk_run:
                /**** [2] ****/
                if(is_jumping){
                    m_state = States::_jump_start_from_walk_run;
                }else if(is_clip_finish && start_walk_end){
                    m_state = States::_walk_stop;
                    std::cout << "walk stop" << std::endl;
                }else if(!is_moving){
                    m_state = States::_idle;
                    std::cout << "walk idle" << std::endl;
                }
                break;
            case States::_walk_stop:
                /**** [3] ****/
                if(!is_moving && is_clip_finish){
                    m_state = States::_idle;
                    std::cout << "idle" << std:: endl;
                }
                break;
            case States::_jump_start_from_idle:
                /**** [4] ****/
                if(is_clip_finish){
                    m_state = States::_jump_loop_from_idle;
                }
                break;
            case States::_jump_loop_from_idle:
                /**** [5] ****/
                if(!is_jumping){
                    m_state = States::_jump_end_from_idle;
                }
                break;
            case States::_jump_end_from_idle:
                /**** [6] ****/
                if(is_clip_finish){
                    m_state = States::_idle;
                }
                break;
            case States::_jump_start_from_walk_run:
                /**** [7] ****/
                if(is_clip_finish){
                    m_state = States::_jump_loop_from_walk_run;
                }
                break;
            case States::_jump_loop_from_walk_run:
                /**** [8] ****/
                if(!is_jumping){
                    m_state = States::_jump_end_from_walk_run;
                }
                break;
            case States::_jump_end_from_walk_run:
                /**** [9] ****/
                if(is_clip_finish){
                    m_state = States::_walk_run;
                }
                break;
            default:
                break;
        }
        if(is_clip_finish){
            std::cout << "should restart" << std::endl;
        }
        return last_state != m_state;
    }

用来检查是否是刚好在一个循环结束时出现bug
在控制台我看到了

其中第一个restart是启动动画的标志，是由在animation_component.cpp中的tick函数中以下部分输出的，它代表了第一个循环的开始。

bool restart = m_animation_fsm.update(m_signal);
                if (!restart)
                {
                    m_ratio = desired_ratio;
                }
                else
                {
                    m_ratio = 0;
                    std::cout << "restart" << std::endl;
                }
                break;

当第二个循环开始时输出“should restart”。但是动画并没有反复播放，只是保持直立不动。
Desktop | 桌面环境

• OS: Windows
• Version: Win10
• CPU & GPU: AMD Ryzen 7 5800H with Radeon Graphics 3.20 GHz
• Memory 16GB
• Compiler MSVC2019

Additional context | 补充信息
Add any other context about the problem here.

[hyv1001]

@Ol6rin , plz check this issue

[Fanby1]

我修改了一下问题，主要是发现我的描述与最初的观察并不准确，正确显示的是启动动画，行走循环一次也没有正确显示。

[Fanby1]

好像破案了，当我写完blend函数之后能显示走与跑得动画了。目测是因为pose[0]是idle的动画，但它的权重为零，如果没写blend那就只能显示这个不动的动画。