In fact i have found a plugin for Sketchup who repair the "lines broken colinear" so that solve my problem for the straight lines on the 3dSpace :)
If someone is interested that is that http://www.crai.archi.fr/RubyLibraryDepot/Ruby/EM/repair_broken_lines.rb

For a 3D curve no linear seems that is more difficult to use it for build a surface :)
But maybe exist a new ruby script who knows? :)