The problem is that, when I load in my .obj file into Roblox, it looks worse than usual. There’s a hole in the cylinders. I’ll show the before and after:
Before:
After:
Anybody know where I can look to solve this problem or something similar?
This is because the faces are inverted.
In Blender, go into Edit mode, select all faces then press ALT + N and select Flip
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If you want to prevent that next time, click the down arrow on the top right of your layout window, above your X/Y/Z plane gimbal, next to those four spheres. Inside the Viewport Shading menu, enable “Backface Culling” under the Options list. This will stop showing you both sides of every face at once, so you can better tell when a face’s normal is inverted.
Whenever you want to correct this, for most cases the best solution is, in Edit mode, to go to Mesh > Normals > Recalculate Outside (keybind Shift + N). If you have real crazy concavity/convexity or altering normals share an edge in a model sometimes it will choose the wrong volume as being the “outside.”
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