Catmull Clark - Subdivision

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Source
https://en.wikipedia.org/wiki/Catmull%E2%80%93Clark_subdivision_surface

• an algorithm used for a type of subdivision surface modeling
• a mesh of a polyhedron

Image Source:

https://en.wikipedia.org/wiki/Catmull%E2%80%93Clark_subdivision_surface

the image above shows the 4 phases that the cube gets subdivided with this algorithm

• the reason why cubes is the best standard primitive when modeling a base mesh is that it gives you more flexibility to either subdivide it or retain it's sharp corners