Problems with registration

[matfcp]

Hi! First of all, congratulations for the fantastic work!

I'm having issues when trying to register two point clouds from my own dataset. It consists of a set of virtual pottery sherds obtained from breaking a virtual pottery vessel in Blender. Here are the pictures from the two sherds' clouds I'm using:

I ran the "assemble_fragments.py" with default parameters and got the following results:

You can notice that the registration is not good since pottery sherds should fit with their borders (breaking faces) side by side.

Here are the border segmentation results ("col_borders_obj1_challenge.ply" and "col_borders_obj2_challenge.ply"):

As you can see, not only the borders are being segmented, but parts of the sherd's body are being classified as borders as well.

Is there a way to improve the results? Unfortunately, this is not a well behaved dataset, so the shapes of sherds and borders are random.

Thanks a lot in advance!