Reversed surface normals will look black.Find lighting settings, turn off 2-sided lighting.These issues should be easy to find and fix using lighting display settings (Each software is different, but generally): Is the directional vector perpendicular to the surface of a 3D model.Įvery face has its own surface normal, and it should be facing outward, away from the model's surface. The surface normal (sometimes called a face normal) Read this article from Shapeways for more in-depth information on how to fix manifold errors: These errors, often caused by open (unconnected) edges or overlapping vertices/faces, can be very difficult to find. Most vendors require all edges to be 2 manifold - as in, each edge has exactly two faces attached to it. Sometimes this extra geometry is hard to spot by only looking at the outside of the model.
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