Mesh Scripting/jp

はじめに
まず、メッシュモジュールをインポートする必要があります: import Mesh これで、FreeCADのC++ Meshカーネルの関数を容易に使うことができるMeshモジュールとMeshクラスへのアクセス権限があります.

作成と読み込み
空のメッシュオブジェクトを作成するには、標準のコンストラクタを使用します. mesh = Mesh.Mesh また、ファイルからオブジェクトを作成することができます mesh = Mesh.Mesh('D:/temp/Something.stl') （互換性のあるファイルタイプのリストは'Meshes'で見ることができますここ） またはそれらのコーナーポイントによって記述三角形の集合からそれを作成します. Or create it out of a set of triangles described by their corner points:

planarMesh = [ [-0.5000,-0.5000,0.0000],[0.5000,0.5000,0.0000],[-0.5000,0.5000,0.0000], [-0.5000,-0.5000,0.0000],[0.5000,-0.5000,0.0000],[0.5000,0.5000,0.0000], ] planarMeshObject = Mesh.Mesh(planarMesh)
 * 1) triangle 1
 * 1) triangle 2

メッシュ-Kernelは、ソートすることによって、トポロジー的に正しいデータ構造を作成するには気を取り 一緒に一致する点やエッジ. The Mesh-Kernel takes care about creating a topological correct data structure by sorting coincident points and edges together.

後であなたがテストして、メッシュデータを調べることができますどのように表示されます. 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. import BuildRegularGeoms 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: t = BuildRegularGeoms.Toroid(8.0, 2.0, 50) # list with several thousands triangles m = Mesh.Mesh(t)

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. m1, m2             # are the input mesh objects m3 = Mesh.Mesh(m1) # create a copy of m1 m3.unite(m2)        # union of m1 and m2, the result is stored in m3 m4 = Mesh.Mesh(m1) m4.intersect(m2)   # intersection of m1 and m2 m5 = Mesh.Mesh(m1) m5.difference(m2)  # the difference of m1 and m2 m6 = Mesh.Mesh(m2) m6.difference(m1)  # the difference of m2 and m1, usually the result is different to m5 Finally, a full example that computes the intersection between a sphere and a cylinder that intersects the sphere. import Mesh, BuildRegularGeoms sphere = Mesh.Mesh( BuildRegularGeoms.Sphere(5.0, 50) ) cylinder = Mesh.Mesh( BuildRegularGeoms.Cylinder(2.0, 10.0, True, 1.0, 50) ) diff = sphere diff.difference(cylinder) d = FreeCAD.newDocument d.addObject("Mesh::Feature","Diff_Sphere_Cylinder").Mesh=diff d.recompute

Exporting
You can even write the mesh to a python module: m.write("D:/Develop/Projekte/FreeCAD/FreeCAD_0.7/Mod/Mesh/SavedMesh.py") import SavedMesh m2 = Mesh.Mesh(SavedMesh.faces)

Odds and Ends
An extensive (though 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.