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Hello!

I am new to CGAL and i am having some questions about 3d boolean operation. 

I have OFF files describing simple 3d objects (box), All the coordinate are
describe in float.
the two box are adjacent!

My program so far consists of:

- built polyhedron from OFF
- converting Polyhedron to Nef_polyhedron 
- Add the Nef polyhedron
- display result

This work well, but the result polyhedron is more complex(in number of faces)
has expected.
After investigation, I discovered that my two coordinates common objects were
not all completely identical ( a difference after 3 numbers under comma).

i use a Exact_predicates_exact_constructions_kernel.

What's the solution for the boolean operation see 2 points like: P1(2.1547
1.7897 2) P2 (2.1548 17897 2) identical?
Is the role of the kernel to do that?

Best regards,
Damien