Bounce the squash stretch trajectory

Put the sketch image on a plane. Position a sphere and set to local transforms. Select the ball and in properties turn on trajectories. Set keys as shown.

Contact with non-uniform stretch.

Note as we go along, the poles of the sphere are always being rotated to match the trajectory. Also, we have to manipulate the track view curves to make our red line trajectory in Max match the drawing trajectory.

a fast non-uniform squash

fast interpolation into stretch at lift off

final position, scale back to almost original shape

Make sure your Z position tangents are sharp when the ball hits and lifts off the floor