Also, can anyone explain how Sketchup chooses (by default, without modifying geometry or anything) which face it will call the front?
Let me give an example of what I mean. This is a bit technical but probably necessary to talk about what’s going on so bare with me please.
I open a new document, delete the man, and then draw 17 polygons parallel to each other evenly spaced apart. There are parallelograms on the bottom and top and all the rest are hexagons. They are evenly spaced apart and all symmetric about the same vertical axis. I draw them in such a way that my lines are all created with the same orientation: going clockwise when viewed from the bottom.
Then I check out how their fronts and backs have been designated. Counting up from the bottom, polygons number 1, 3, 4, 6, 7, 8, and 10 have their fronts on the bottom while polygons number 2, 5, 9, and 11 through 17 have their faces on the top.
What sort of algorithm decided this? Is it just random?