AutoCAD/3D Studio - No-till seed drill

In 1988-89 I was employed by an agricultural engineering company in Seattle. They were designing and building a no-till seed drill, for which I did all of the working drawings. This image was composited from an AutoCAD drawing and a 3D Studio background image. The yellow and green lines, representing hills and crops, was one of a number of designs that I designed and proposed. A feature of the drill was that it could seed on much steeper hillsides than any other drill, making more farmland available for seeding.