@Julius thanks !
how can I delete it ? If I erase it, a surface disappears ...
may be there is a pluggin for that
@Kwistenbiebel no...not yet, I wait for my new computer, I think I will have it next friday, then I will begin works with Zbrush too and colour/rendering with my Sketchup models .
thanks for asking
but you can see some "rendering" on my website (3d) . But I think I will do better mith my new machine