Stage not build by me, I just add some dynamic effect. Looks like https://www.bilibili.com/video/BV1De4y167Sx/
After I added spectrum effect, I found a problem. Even this dance stage is pretty big, still sometimes camera go out of room or go down the stage. So I implemented the camera position limit in new MMDD, and now the stage is completed!
Recommend use with playlist, so you don't need to change chara's anime back to T-pose. Of course turn on Focus Correct and Position Limit in camera setting.
Have fun.