Mesh FromPartShape

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Mesh

Menu location
Mesh MeshFromShape‏‎
Meshes → Create Mesh from Shape
Workbenches
Mesh
Default shortcut
None
Introduced in version
-
See also

Contents 1 Introduction 2 Usage 3 Mesher program 3.1 Standard Mesher 3.2 Mefisto Mesher 3.3 Netgen Mesher 4 Scripting 5 Notes

Introduction

This command creates a mesh from a shape object.

Usage

There are two methods:

Either select the shape object, then choose Meshes → Create Mesh from shape... from the top menu.
Just selecting Meshes → Create Mesh from shape... will give you an additional menu to choose your shape to mesh.

In both cases you get a menu that asks for the mesher program to use and its settings.
The settings you make there will be stored and used as default for the next time you create a mesh from a shape. introduced in version 0.19.

Mesher program

You can choose one of these 3 mesher programs:

Standard Mesher

You can change these settings:

Surface deviation: Maximal linear deflection of a mesh section from the surface of the object
Angular deviation: Maximal angular deflection from one mesh section to the next section
Relative surface deviation: If checked, the maximal linear deviation of a mesh segment will be the specified Surface deviation multiplied by the length of the current mesh segment (edge)
Apply face colors to mesh: If checked, the mesh will get the face colors of the object
Define segments by face colors: If checked, mesh segments will be grouped according to the color of the object faces. These groups will be exported for mesh output formats supporting this feature (e.g. the format OBJ).

Mefisto Mesher

The only setting is:

Maximum edge length: If this number is smaller the mesh becomes finer. The smallest value is 0.

Netgen Mesher

You can choose between mesh Fineness being:

Very coarse
Coarse
Moderate
Fine
Very fine
User defined

For this you can set these values:

Mesh size grading: If this parameter is smaller, the mesh becomes finer. A value in the range of 0.1-1.

Element per edge: If this parameter is larger, the mesh becomes finer. A value in the range of 0.2-10.

Element per curvature radius: If this parameter is larger, the mesh becomes finer. A value in the range of 0.2-10.

For every Fineness you can also choose:

Optimize surface: Whether an optimization of surface shape will be done.
Second order elements: Whether second order elements will be generated.
Quad dominated: Whether meshes will be arranged preferably using quadrilateral faces.

Scripting

This tool can be used in macros and from the Python console by using the following function:

MeshPart.meshFromShape(Shape=Shape, MaxLength=520)

Example:

import FreeCAD, Draft, Arch, Mesh, MeshPart

Line = Draft.makeWire([FreeCAD.Vector(0, 0, 0),FreeCAD.Vector(2000, 2000, 0)])
Wall = Arch.makeWall(Line, width=150, height=3000)
FreeCAD.ActiveDocument.recompute()

Shape = Wall.Shape.copy(False)
Shape.Placement = Wall.getGlobalPlacement()

mesh_obj = FreeCAD.ActiveDocument.addObject("Mesh::Feature", "Mesh")
mesh_obj.Mesh = MeshPart.meshFromShape(Shape=Shape, MaxLength=520)
mesh_obj.ViewObject.DisplayMode = "Flat Lines"