- It refers to errors in the boundary edges of a 3D model.
This also applies to the boundary of the inner and outer edges of a polygon mesh.
![Boundary edges](https://d283umxtky5avq.cloudfront.net/archives/046/202204/4bda5b938ec27a0249e2836cf1dbd9f94171c0fdaf8c71fe066734358b5f1020.png)
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This also applies to the boundary of the inner and outer edges of a polygon mesh.