In the following steps, you set a playback range
that’s long enough to see the animation clearly. You also create
the ball and the door, and position them in the scene view in preparation
for the animation.
Scale
and position it roughly as shown in the previous figure. Have the bottom
edge of the door lie roughly along the X-axis.
With
the pointer in the perspective view, press 5 (for Shading
> Smooth Shade All).
Create
a small polygonal sphere and name it Ball.
Scale and position it roughly as shown in the prior figure in the
introduction. Have it sit roughly at 0, 1, 10 (X, Y, Z).