The link you have supplied is 404.

There seems to be an npm package online, but this site says that the project seems to be discontinued.

hi,I want to ask a question.
When I stroke the mesh obtained after the operation, it shows the lines I don't want, how should I combine csg to solve this problem.

  const material = new MeshBasicMaterial( {color: 0x00ff00} );
  const box = new Mesh(new BoxBufferGeometry(1, 1, 0.1), material);
  box.position.set(0, 0, 0);

  const hole = new Mesh(new BoxBufferGeometry(0.2, 0.2, 1), material);
  hole.position.set(0.1, 0.1, 0);
  

  const csg = new CSG();

  csg.subtract([box, hole]);

  const resultMesh = csg.toMesh();


  const edges = new EdgesGeometry(resultMesh.geometry, 45);
  const wideEdges = new LineSegmentsGeometry().fromEdgesGeometry(edges);
  const mt = new LineMaterial({
    color: 0xff0000,
    linewidth: 2
  });
  mt.resolution.set(window.innerWidth, window.innerHeight);
  const line = new LineSegments2(wideEdges, mt);

  scene.add(line)

I have strange behaviour that only on some specific angles of my meshes the result is broken. The red meshes are the meshes which cut the cube. Seems only the problem when 2 cutting meshes are near:

Sometimes all is right, an when chaing the rotation i sometimes get bugs:

What can I try? Also how can I check if my mesh is broken so that I could try an iterative solution?

Intersection is not working properly. If you enable the intersect test in csg-test.js it should show a quarter ball, instead it shows two flat pieces.