Theo is right,
Image quality has a direct affect on how clean the model looks but the location of Image quality is a document property. Tools/Options/Document Properties/Image quality Be careful with this though because remember that higher quality uses more resources..
If you wish have your edges shown with anti-Aliasing turned on, you may find that under Tools/Options/System Options/Display Selection and select "Anti-Alias Edges"
Hope that helps,
Regards,
Jon
jgbena@yahoo.com