Hey there,
I added a couple windows to a tower I’m modeling with a Boolean operation. In Shade Flat it looked fine. When I tried Shade Smooth Blender went berserk. Take a look:
What is happening?!!
Any thoughts at all would be greatly appreciated. Thank you in advance!
George
“Shade auto smooth” is going to be your friend in your case 
As for what is happening: the smooth shading is trying to be calculated from a lowpoly mesh that doesn’t have edge loops around holes which would help it out.
That’s normal ! you’ve discovered the importance of topology. Boolean operations just carve volumes out, but they don’t create support loops or adjust normals. They’re not supposed to be used as-is, you’re always meant to correct topology afterwards. Unless your objects are high-res enough that the resulting mess doesn’t matter too much, but that’s not the case here, as your tower seems pretty low-res. So either you subdivide your tower first, make it all round and beveled and whatnot, and then use boolean on it, or you keep it low-res, then use your boolean, and finally go in edit mode and correct topology to get rid of n-gons, create support loops to help with subdivision, or if you don’t care about subdivision you can just play with a weighted normals modifier, see if it’s enough to even things out.
ha, thank you!
Thank you Hadriscus! Really appreciate it man
