Mesher | STL viewer and editor | 3D Printing library

I am trying to apply Delaunay_mesher_2::refine_mesh to a set of numbered vertices (i.e. vertex class is Triangulation_vertex_base_with_id_2). I expect that any vertex created in the process should have id()==0. However it turns out to be not the case. Instead, the IDs have various positive/negative values.

I tried using Triangulation_vertex_base_with_info_2, but the result was the same.

More or less my code works like this:

I am using CGAL 4.13 to do some 2D triangulation of an outline. In my case some random data originally read from GeoJSON:

The triangulation is done exactly like mentioned in the CGAL user manual: https://doc.cgal.org/latest/Mesh_2/index.html#title14

But when I fetch the triangles out of the Mesher (via mesher.triangulation()), is do not only get the inner triangles but also some "outer" triangles:

Is there a way to get only the triangles matching to the outlines? Like this:

I try to integrate cgal library to my python program. I made some test by following diverse tutorial. And I try to do a template but I have an error when I compile and I don't know how to fixe it. I use pybind11 to integrate cgal.

Part of my mesher.cpp code :

In the Fenics documentation, it is mentionned that

This is query 1:

First, I create a softlink to the executable mesher and I confirm that it's actually there:

Given a cubic space, this function searches for the next large empty space, places a marker there, and then quits.

However, the function doesn't even print the check message that exists prior to the loops starting, so i don't know how to debug it. The checking starts at 0,0,0 and spaces outside the voxel are returned as true, so it should default all the first loops and send messages back. The unity.exe process jams and i have to abort it.

Why doesn't it print? What else is wrong with it? Even if it is slow, i should be able to track progress within the loops? why wouldn't it?

I have voxel files of 1billion voxels, every voxel is true/false and is kept in a 1D boolean array.

What is a good way to copy it to disk, for example as bytes/ a 0100010101 ASCII file, where i can read the file back into memory fast and efficiently?

At the moment i can write files to disk using: