Thanks guys, I'll try and see what happens.

@tig said:

For general stl tools look here http://www.sketchup.com/intl/en/download/plugins.html

This link is to Trimble's own free stl exporter launched last October...
https://github.com/SketchUp/sketchup-stl
and here's other stuff about it http://www.mastersketchup.com/installing-the-sketchup-stl-exporter-plugin/

Hi!

Thank you!

Thanks for the comment.

I try to

form

I thought about past performance
Bezier Surface will know something like that?

Hi.

project.jpg

The same is rendered

render_3.jpg