Orientation in Split into Chunks

[rbnkc]

I have a model that is too big for my computer so I am going to use the Split_into_Chunks python script to process it. As currently oriented, I want to break the model into three chunks along the z axis (1X3). From reading over the code I get the impression that the program generates chunks along the X and Y axis. Reorienting the model is not a big deal but I thought I would confirm this before making any changes. If it is x and y, is there any easy way to mod the code to generate along the z axis?

Also wanted to check if, after updating to MetaShape if I need to change the references to Photoscan in the code to Metashape ex. "import Photoscan" to "import Metashape". I imagine so.