9

Motion Capture Utility 657
3.
Right-click in the Rotation track to display the
Motion Capture properties dialog.
4. Click the button beside Z Rotation, and assign
aJoystickInputDevice.
5. Under Joystick Axis, choose the X option (if
it’s not already chosen ).
6. Check Accumulate so that the rotation won’t
return to zero each time you release the jo ystick.
Ex ample: To set up t he Position controller s of a
camera for moving with a j oystick :
The rotation of the camera about its world Z axis
will be controlled by the X motion of the jo ystick.
You’ll set up the Position controllers of the camera
to move the camera forward and back with the Y
motion of the joystick.
1. Assign a Position Motion Capture controller
to the camera’s Position track, and access its
Properties dialog.
2. Assign a Joystick Input Device to both t he X
P osition and Y Position buttons.
3. Click the Edit Binding X button, and then
choose the Y option under Joystick Axis.
4. Check Accumulate.
5. Click the Edit Binding Y button, and also
choose Y u nder Joystick A xis.
6. Check Accumulate.
The Y motion of the jo ystick will now affect
both the X and Y positions of the camera.
Ex ample continued: To add the increment based on
direction options:
If you tested the camera motion at this point,
moving the joystick forward or backward along
the Y would produce a diagonal motion because
the Position tracks would receive equal amounts of
X and Y values. Adding the Increment Based On
Direction options will change this.
1. Click the X Edit Binding button.
2. Under Increment Based On Direction, click the
button beside Controller.
A dialog appears with a list of controllers.
3. Find and select the Rotation Motion Capture
controller for the camera.
4. SettheDirectionoptiontoZ(thelocalaxis
along which the direction points).
5. Set the Componen t option to X (matching the
Edit Binding button).
6. Click the Y Edit Binding button.
7. Click the button b eside Controller, and assign
the Rotation Motion Capture controller.
8. SettheDirectionoptiontoZ,thensetthe
Component option to Y.
9. Open the Motion Capture utility, tur n on both
tracks in the list, click the Test button, and
move the camera while observing it in the Top
view por t.
As you move the joystick in the Y direction, the
camera moves for ward or backward. Moving
the joystick in the X direction rotates the
camera,butthen,asyoucontinuemovingthe
joystick in the Y direct ion, the camera moves
forward and back along its local axis.