I made a Blender file that has the white square on the black background for you. Looking at it in action may help you get an idea of what goes on with fields:
Load the program
6907_12_Fields.blendfrom yourChapter 12download pack.Press F12. You see a white square on a black background.
In the Post Processing subpanel of the Render panel in the Properties window, check the Fields checkbox.
Press F12.
When you have fields turned on, two images are rendered and merged. One image represents the time during the first half of the frame. Every other line is rendered. The other represents the time during the second half of the frame. Then the alternating lines are rendered.
When both fields are rendered, on the computer screen, the image looks like the following screenshot. The left-hand fringe is where the square was only during the first field, the right hand fringe is where the square was only during the second field. The solid...