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is a graphics directive that specifies what type of joins should be used to connect segments of lines, tubes, edges, and related primitives.


  • The following types can be used in JoinForm[type]:
  • "Bevel"truncate the corner
    "Miter"extend the corner toward a point
    {"Miter",d}extend by at most d times the line width
    "Round"cover the corner with a disk
    Nonedo not join segments
  • JoinForm works in both 2D and 3D.
  • In 2D, the default is JoinForm[{"Miter",3.25}]. In 3D, the default is JoinForm["Round"].
  • JoinForm[{"Miter",1/Sin[θ/2]}] gives sharp corners for any join angle larger than θ.
  • JoinForm can be used inside EdgeForm.
Introduced in 2008