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Creating a walking cycle




Animating pin positions

Stiffening an area

The character’s arms and legs should move as he walks, but his torso should stay fairly firm. You’ll use the Puppet Starch tool to add Starch pins where you want the character to be stiffer.

1 Select the Puppet Starch tool (), hidden behind the Puppet Overlap tool in the Tools panel.

2 Select Show in the options area of the Tools panel to display the distortion mesh.

3 Place Starch pins in the lower half of the torso, asin this image.

4 Hide the properties for the man.psd layer in the Timeline panel.

5 Choose File > Save to save your work so far.

_ Note: The Amount value determines how rigid the area will be. Typically, a low value is fine; higher values make the area more rigid. You can also use negative numbers to reduce the rigidity of another pin.

The Deform, Overlap, and Starch pins are in place. Now you can change the Deform pin positions to animate the character. The Overlap pins keep the front areas in the front, and the Starch pins keep specific areas (in this case, the torso) from moving too much.

Initially, the character should be walking across the screen. To create a realistic walking cycle, keep in mind that as humans walk, wave patterns develop in the motion path. You’ll create a wave pattern in the pin positions. However, the values will vary slightly to add a bit of randomness, and to keep the character from looking too much like a robot.

1 Select the man.psd layer in the Timeline panel, and then press U to display all the keyframes for the layer.

2 Press Home, or move the current-time indicator to the beginning of the timeline.

3 In the Timeline panel, change the position of the Deform pins as follows:

􀁴 Head: 845, 295

􀁴 Torso: 821.5, 1210

􀁴 Left Leg: 1000.5, 1734

􀁴 Right Leg: 580.5, 1734

􀁴 Left Arm: 1384.5, 1214.7

􀁴 Right Arm: 478.5, 1108

_ Note: After Effects automatically creates keyframes when you place Deform pins, so you don’t need to click the stopwatch for each pin before setting its initial position.

4 To complete the walking cycle, move the pins to the following positions at the times indicated in the chart below, even if they represent a pin’s current position.




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