So, if a 3D model contains non-manifold modeling errors, will look different when rendering the 3D file. During this procedure, its edges and its vertices are being specified and the object is being drawn as a set of lines at the location of every single edge. Though, when 3D rendering, the 3D model is being converted into a 3D frame model. Once you are in the 3D modeling software, these kinds of errors may not be visible, as you are dealing with the shape and the volume of the 3D model as a whole. In addition, errors that create a shape without volume should be fixed or eliminated at all. It may also happen that faces attached to each other are connected to a single point, and not to a single edge. This is because during the creation of a 3D model some operations may create unattached surfaces or they may divide a surface.
This is a very common error that may occur while creating a digital object.
A vector field of normals on a surface – Image from Wikipedia
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