SubD - a brief intro

Polygon subdivision surface. A boundary representation of the solid/volume

  • Starting point: A coarse polygon mesh
  • This mesh is automatically divided into finer meshes by recursive evaluation
  • Typical used division algorithm: Catmull-Clark
  • Modelling can be done by directly moving the vertices of the original coarse mesh


  • Modelling of advanced freeform/organic shapes may be easier with SubD than with NURBS
  • Provides surface control
  • Many operations such as fillet and accurate boolean is not possible
  • Accurate dimensions is difficult to achieve due to the subdivision operation
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