Here I want to show a simple example of how I added an interaction between a real actor and the virtual world.
In this case, the girl that moves the water with her hand.
This requires to create a 3D object that follows the movement of the real hand and interacts with the virtual water.
There are many different ways to do this, I tried this way :)
Note: I uploaded another video where I also tried to cast some shadows from the actor to the ground and the pool.
This requires a different workfllow that you can check out here:
https://youtu.be/K1x-csRmOyE