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Some high school friends and I have been playing an old FPS we used to play, and I've started getting into making maps. I recently dipped my toes into Blender to create some custom models for the game, and a recent project is to reconstruct a simplified version of one side of an Acela train car.

As a starting point, I added and rotated a plane, made a loop cut to make the "bend," then used the Solidify modifier to give it some thickness.

Part one of my project, creating a thick plane with a bend in it

Then I wanted to add a hole for a window, so I created a cylinder, extruded it sideways to create an oblong shape, positioned it in the right spot, and used a Boolean modifier to take the difference. Then, I exported the mesh as a .obj, which is natively supported by the game. So far, in Blender and in Xcode (my most-handy OBJ-file viewer), everything looks right!

My plane with a cylinder where the window would go My plane with the Boolean modifier applied to remove the window area My exported OBJ file previewed in Xcode

But in the game, I've got some strange, jagged artifacts.

A broken-looking version of the object running in the game

It reminds me of the kind of things I see when a path is drawing in the wrong order (CW vs. CCW) in 2D drawing. If I apply the modifier and look at the mesh in edit mode, I can kind of visualize why things are going wrong, but I'm not sure how to fix it. I tried bisecting the mesh across the window hole to create a more "sane" arrangement of faces/edges…

An attempt at bisecting the plane

… but it doesn't look much different in the game. Any thoughts on what I can do to fix this?

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Maybe rework your topology, keep only one face, use the knife tool (K to activate, C to cut perpendicularly) try to keep only quads, extrude to give thickness back.

enter image description here

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  • $\begingroup$ I'm still working my way through figuring out exactly how to get it working the way I want, but creating a grid of quads like above made it work a lot better. Using the Boolean modifier still produces unexpected results, so I think I'll need to get better at figuring out how knife project works. $\endgroup$ – Matt Patenaude Aug 8 '20 at 3:52

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