Intanto il mio contributo alla diffusione del comando clip (fissaggio), utile in questo caso a conformare un'ombra alla parte inferiore di un velivolo. E' in inglese, ma si capisce:
How to give some shadow to a fuselage (image 1), is my personal solution.
2 - Trace the contour of the area to be shadowed being careful to follow the gentle curve of the fuselage bottom;
3 - Choose color, usually dark green or black; discard stroke; give the proper blur an transparency to the fill, until you're satisfied;
4 - duplicate fuselage: this will be the "crop area" and will be invisible after the cropping (that's why we work on a copy of the fuselage"
5- Menu Object, Clip->Set.
Link
https://pin.it/1E5Y9xXhttps://www.facebook.com/1471469853109154/photos/a.1474961286093344/1483273128595493/?type=3&theater[allegato eliminato da un amministratore]