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.


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Basic Examples  (2)

A rounded line join:

A rounded tube join:

Scope  (3)

Specify joining of line segments:

Specify joining of tubes:

Use EdgeForm to control the joins of edge lines:

Neat Examples  (1)

Different line cap and join forms:

Wolfram Research (2008), JoinForm, Wolfram Language function,


Wolfram Research (2008), JoinForm, Wolfram Language function,


@misc{reference.wolfram_2020_joinform, author="Wolfram Research", title="{JoinForm}", year="2008", howpublished="\url{}", note=[Accessed: 14-May-2021 ]}


@online{reference.wolfram_2020_joinform, organization={Wolfram Research}, title={JoinForm}, year={2008}, url={}, note=[Accessed: 14-May-2021 ]}


Wolfram Language. 2008. "JoinForm." Wolfram Language & System Documentation Center. Wolfram Research.


Wolfram Language. (2008). JoinForm. Wolfram Language & System Documentation Center. Retrieved from