After you input your dimensions and hit the submit button, the program generates an ellipsoid with semi-axes based on your choices.
Each picture is a horizontal cross section, and level zero is the ground floor. Black represents the solid parts of the ellipsoid, gray represents a solid floor below, and white is empty space (and an empty floor below). I'm working on a better visualiztion, but this works fairly well for small structures.
Pictured above: my sweet new beach hut in Minecraft.
Note: Because of the way I draw each 'floor,' large, flat structures will have holes in them. I'm workin' on this as well.
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bloop.