Jordi Picón

Thank you Peter. With bump I do not have that problem. Thank you. I added also a vertex SOP to clamp the normals and it works good enough, at least to achieve what I want by now. I'm new on that software, so I do not have a clear idea to do what you mean but I'll try the bespoke method that you suggest. Thank you. Have a nice day.

Hello, I'm not going to explain lots of details. So it is simple to read it and to know the problem. I have one object fractured with voronoi. I have enabled the option to create a material. I apply a material to inside (displacement) and outside (mantra surface) if I enable the displacement option I can see all the pieces on the outside material. I attach some pictures. Can anyone help me please? I want the skin to be without that black shapes. Thanks in advance.