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Blender 3D Incredible Machines by Christopher Kuhn

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Manifold versus non-manifold meshes

Before going further, there's an important topic we need to touch on. Right now, we can see the back side of our body panels from certain angles. In other words, when you look into the wheel well, you can see the back side of the faces that make up the truck's tailgate.

This generally isn't a good thing, because it reveals the single-sided nature of the faces (and can sometimes have odd effects on your shading and materials). However, you can often get away with it in Blender. If you happened to see the back side of a body panel during an animation, it would be hidden in shadows and probably wouldn't look too bad. This is especially true with a low-poly model like this, where you're not expecting perfect realism. ...

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