Function 'threejs-slice-BufferGeometry()' upgrade

Using this function '[login to view URL]' to create the BufferGeometry version of it. So the geometry to be sliced is a BufferGeometry and the slicer is a PlaneGeometry. Any suggestion of another solution can be provided for analyse before the project is given. The need is to slice some geometry created by ObjLoader with a PlaneGeometry. Both are already defined in coordinates from Mesh and visible on screen.