The OpenGL functions for viewing and projection appear within the parameter input window, which is scrollable.
The parameters that you can change for the methods are shown in green.
When you click on a changable parameter, the color changes to yellow and remains with this color
while you drag the mouse (left button) UP or DOWN to increase or decrease the value. Maximum and minimum values are set for each changable value. Thus, if the value stops changing while dragging the mouse, the value has reached its minimum or maximum.
As with the parameter input window for other tutorials, you can also change a selected item (drawn in yellow) using the Up-Arrow and Down-Arrow keys. The amount added to or subtracted from the selected item is fixed within the program. However, a multiplier is also used in making the change. You may adjust the multiplier through the Page-Up and Page-Down keys. Making the mulitiplier larger accelerates the change that is made to the selected item.