Television viewers have had trouble figuring out -where the first-down line is in relation to the offense.

The computers know exactly where the cameras are located in the 3-D model and can orient the virtual first-down line on the field accordingly.

They're going over the first-down line, and they're coming back for the ball.

How do they superimpose the first-down line onto the field on televised football games?

Learn how do the broadcast stations superimpose the first-down line on the football playing field.

The cost to NBC is believed to be less than the $20,000 a game that it costs to use the computerized first-down line.

These innovations were quickly adopted by rival networks and helped to drive the development of further innovations such as the virtual first-down line.

Drawing the Line Five computers are used to draw the virtual first-down line.

There are artificial score boxes, first-down lines and graphics, so why not some musical interludes after big plays?

When they were stopped short of the first-down line, Clemson's offense returned to the field.