Mesh/de

Einleitung
In FreeCAD wird das Wort "Polygonnetz" normalerweise verwendet, um sich auf ein Polygonnetz PolygonnetzObjekt ( Klasse)zu beziehen, ein Objekttyp, der 3D Daten definiert, aber kein Volumenkörper "Form" ist.

Polygonnetze sind sehr einfache Objekte, die nur Knoten (Punkte), Kanten und dreieckige Flächen enthalten. Im Allgemeinen sind sie leicht zu erstellen, zu modifizieren, zu unterteilen und zu dehnen und können ohne Detailverlust von einer Anwendung zur anderen übertragen werden. Da die Netze sehr einfache Daten enthalten, können 3D Anwendungen wie Animationssoftware und Videospiele sehr große Mengen von ihnen (Millionen von Dreiecken) ohne großen Rechenaufwand verwalten.

However, in the field of engineering meshes present one big limitation: they are only made of surfaces, and have no "mass" information, so they don't behave like "solids". This means that solid-based operations, like boolean addition or subtraction, are difficult to perform on meshes. Also, since they are defined by individual points, they are hard to describe in a parametric fashion.

See Mesh MeshObject for more information about this type of object, and see Polygon mesh for generic information in computer systems.



Usage
Meshes are normally created by internal functions of the Mesh Workbench, or by importing mesh format files, like STL and OBJ.

Essentially, every object derived from a Mesh Feature ( class) is expected to hold and manipulate a Mesh.

Since FreeCAD is designed to be a solid modeller primarily, it is better suited to deal with solid Shapes. It can import and display Meshes in the 3D view, but to transform them or create new geometry, the Mesh first needs to be converted to a Shape (see Part ShapeFromMesh). In many cases, this conversion is not automatic, and requires re-creating the geometry using solid modelling techniques, making use of Part and PartDesign tools.

Finite element meshes
In FreeCAD the word "Mesh" may also refer to a specific object that will be used in finite element analysis (FEA).

When an object with a solid Shape is used in the FEM Workbench it will be discretized into a triangular mesh. In this case, the resulting object is a Fem FemMeshObject ( class), and is not derived from a Mesh Feature ( class).

For more information see FEM Workbench and FEM Mesh.