By comparison, for a mesh sphere, if you zoom in far enough, the faces will be visible–if smoothing is off. No matter how far you zoom in, it will always be displayed as a smooth sphere. A sphere in a parametric modeler like SolidWorks is a mathematical construct that defines its diameter. A sphere in a mesh modeler like Blender is composed of many triangular polygons enclosing a spherical volume. As an example for a very simple case, consider a sphere. These are composed of mathematically defined features. By comparison, programs like SolidWorks, Creo, Inventor, etc. The meshes are infinitely thin surfaces that completely enclose the mesh object. The issue is programs like Blender, Maya, etc. STEP files are used to import/export parametric models and assemblies. I don’t believe you will find software that can create a STEP file from a mesh for the general case.
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