I am trying to figure out how to smoothly connect isometric tiles at levels. For example, below are tiles at different levels. I want to smoothly connect the tiles at the two levels based on the surface texture (the green grass on top). I can do a shear with the left and right halves of the top texture to connect a "corner", but I can't figure out what the transformation is to smoothly connect an entire face. For example, I want the 2nd level height to smoothly connect to the top texture of the bottom layer along the west facing side.
I looked at this old question here: How to create tilted (height) isometric tiles. but I can't understand the solution of "shearing to the right, then rotate by 45 and scale in height".