电子书用哪个Pp

Time for action – Moving the ball Into the "sky"

We want the ball to start somewhere in the "sky" (the area above the "ground" plane) so that it will have somewhere to fall from.

Make sure that the Ball Game Object is selected. Click on it in the Hierarchy panel.
See the control gizmo poking out from the center of the ball? You can either click-and-drag the green Y-axis to move the ball up, or type a new Y position for it in the Inspector panel. As we want to stay on the same page together, let's type it. Look in the Inspector panel and find the Y field—it's next to Position in the Transform component of the Ball.
Change the Y position from 0 to 2.
Press the Enter key to commit this change.
Your ball may not have begun life at the origin. Make sure that the values for its X and Z position are at 0.
The Ball Game Object should now be hovering two units above the ground plane, which is a marvelous height from where any self-respecting ball can endeavor to fall.