Question How to accurately display liquid amount in a shader graph?

I made a liquid shader from this tutorial:

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It works great as seen in this image:
https://drive.google.com/file/d/1YhRmu0xAEt83WVhyiiSTuAcuXwYo0Qet/view?usp=share_link
but when I rotate it, the number of liquid decreases as shown in this image:
https://drive.google.com/file/d/19dq1clvyO0NNxcN2dvelLjbobRSQy86z/view?usp=share_link

What should I change in the shader graph to fix this?

 

The shader graph has absolutely no idea how much "volume" your polygons represent. There is no way. It varies with every shape, and every asymmetric rotation of the shape. You will have to decide the level through some other modeling scheme, and communicate the level to the shader you have.

Edit: it looks like you are moving the model, or using the wrong coordinate space for you to specify the level to the shader parameters.

 

I figured out a way to fix this through an external script, what I was trying to do isn't possible in shader graph alone.