Mesh Scripting

Introduction
First of all you have to import the Mesh module: After that you have access to the Mesh module and the Mesh class which facilitate the functions of the FreeCAD C++ Mesh-Kernel.

Creation and Loading
To create an empty mesh object just use the standard constructor: You can also create an object from a file

What file formats you can use to build up a mesh is noted here.

Or create it out of a set of triangles described by their corner points:

The Mesh-Kernel takes care about creating a topological correct data structure by sorting coincident points and edges together.

Later on you will see how you can test and examine mesh data.

Modeling
To create regular geometries you can use the Python script BuildRegularGeoms.py.

This script provides methods to define simple rotation bodies like spheres, ellipsoids, cylinders, toroids and cones. And it also has a method to create a simple cube. To create a toroid, for instance, can be done as follows:

The first two parameters define the radiuses of the toroid and the third parameter is a sub-sampling factor for how many triangles are created. The higher this value the smoother and the lower the coarser the body is. The Mesh class provides a set of boolean functions that can be used for modeling purposes. It provides union, intersection and difference of two mesh objects.

Finally, a full example that computes the intersection between a sphere and a cylinder that intersects the sphere.

Exporting
You can even write the mesh to a python module:

Odds and Ends
An extensive, ought hard to use, source of Mesh related scripting are the unit test scripts of the Mesh-Module. In this unit tests literally all methods are called and all properties/attributes are tweaked. So if you are bold enough, take a look at the Unit Test module.