I have a little problem in SketchUp

Sometimes I import models from AutoCAD to SU and some solids have double faces
a)How can I identify and delete them, there is some plugin?
b) Why some curves lines (ellipses) looks faceted... can fix that little problem... how?

Thanks for your help

Hi there...

try this:

http://www.youtube.com/watch?v=Q6GanH7wDpc&eurl=http%3A%2F%2Fsoftware.asgvis.com%2Findex.php%3Foption%3Dcom_content%26view%3Darticle%26id%3D346%26Itemid%3D480&feature=player_embedded

or this:

http://www.youtube.com/watch?v=Q6GanH7wDpc&eurl=http%3A%2F%2Fsoftware.asgvis.com%2Findex.php%3Foption%3Dcom_content%26view%3Darticle%26id%3D346%26Itemid%3D480&feature=player_embedded