MODELLING CONCEPTS
6-poles.
It is normally considered bad modelling practice to have more than 5 spokes to any pole in subdivision surface modelling but there are occasions when a 6 spoked pole is appropriate and other times when they are the best modelling solution. They are often used on the corners of cubes In this arrangement:
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Whenever three extrusions meet along separate axes to define curvature (as in the example below) 6 spoked poles are unavoidable and can also be considered acceptable.
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Creating corners using 6 spoked poles.
6-spoke Poles at internal three-way intersections
When retopologising a 2D object as a 3D object (from a font or an SVG), There will often be shapes which will benefit from the placement of a 6-pole in order to avoid straight polygons.
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6-poles can also comfortably exist at an intersection of two local geometries which share a border. Rather than creating unnecessary additional geometry between them, a 6-pole will be created which should, under most circumstances, perform very well.
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