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MODELLING CONCEPTS
Face.
A collection of vertices connected in a clockwise or anticlockwise arrangement make a face.
Faces are also called polygons and the terms are completely interchangeable in 3D.
A face must have all of it's edges connected on all sides and filled in to be considered a face.
Blender allows both planar and nonp-planar faces to exist but the use of non planar faces is considered problematic as the ultimate triangulation (as happens when finalizing a version of a model for as particular destination or at render time) becomes unpredictable (although renderering engines can interpret and display them.)
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Faces selected on a mesh
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