Mesh SectionByPlane

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Mesh SectionByPlane.svg Mesh SectionByPlane

Menu location
Meshes → Cutting → Create section from mesh and plane
Default shortcut
Introduced in version
See also
Mesh CrossSections


The Mesh SectionByPlane command creates a cross section across a mesh object. The cross section is a Part Feature.


  1. Select a single mesh object and a single Part plane. The (extended) plane should intersect the mesh object.
  2. There are several ways to invoke the command:
    • Press the Mesh SectionByPlane.svg Mesh SectionByPlane button.
    • Select the Meshes → Cutting → Mesh SectionByPlane.svg Create section from mesh and plane option from the menu.


See: Part Feature.


See also: FreeCAD Scripting Basics.

To section a mesh use its section method. The method requires a second mesh object that need not be planar.

import FreeCAD as App
import Mesh
import Part

# Create a non-parametric box-shaped mesh:
msh = App.ActiveDocument.addObject("Mesh::Feature", "Mesh")
msh.Mesh = Mesh.createBox(30, 40, 50)
msh.ViewObject.DisplayMode = "Flat Lines"

# Create a planar mesh from 3 points:
p1 = App.Vector(-20, -60, 0)
p2 = App.Vector(65, 25, 0)
p3 = App.Vector(-20, 25, 0)
msh_plane = Mesh.Mesh([p1, p2, p3])

# Find the section loops (each loop is a list of points):
loops = msh.Mesh.section(msh_plane)

# Show the loop polygon:[0]))