Instructions

To set the ball within the D-zone, double click at desired location

The original rendering of the cueball is not set, just a placeholder render

If the cueball is not set, there will be a prompt: "Set position of cueball, double click"

Select the ball before launching the cue, if the ball is not selected, there will be a prompt: "Please select the cue ball"

if the cueball is not selected, it wont launch

To launch the cue ball press and hold d, and the cue ball will launch at the direction of the cue stick

For better control of the angle, mouse click and drag away from the cueball, this will activate a display specifying the angle and the power,
cue ball must still be launched from the "d" key

keypress 1, 2 or 3 to change the different modes

If still unclear, the video will explain the mechanics