Apple Motion 4 - Manual (Page 1193)

• Move XZ: Drag here to move the selected object in the Canvas along the X and Z axes.
Dragging right or left increases or decreases the value of X. Dragging up or down
increases or decreases the value of Z. Hold down the Command key when dragging
to constrain movement to the axis corresponding to the initial direction of the drag.
Tip: As in the Inspector, holding down the Shift key while you drag in the HUD makes
larger changes. Holding down the Option key while you drag makes smaller changes.
Rotate and Scale: Two additional drag controls in the HUD let you rotate and scale the
selected object in the Canvas:
• Rotate XYZ: Drag here to rotate the selected object in the Canvas around all axes.
Starting at the origin, dragging up and down rotates the object around the X axis.
Dragging to the left and right rotates the object around the Y axis. Hold down the
Command key while dragging to constrain rotation to the Z axis.
• Scale: Drag here to uniformly scale the selected object in the Canvas. Dragging to the
right or up (or both) increases the Scale value. Dragging to the left or down (or both)
decreases the Scale value. Hold down the Command key while dragging to constrain
scaling to the axis corresponding to the initial direction of the drag.
Adjust Around: The Adjust Around pop-up menu, located under the Move, Rotate, and
Scale controls in the HUD, allows you to select which relative coordinate space is used
for transforms. The Adjust Around pop-up menu has three options:
• Local Axis: The default, this option orients the onscreen transform controls to the
object’s local axes.
• World Axis: This option orients the onscreen transform controls to the axes of the 3D
grid in the Canvas.
• View Axis: This option orients the onscreen transform controls to the view space of the
current view. The Z axis is aligned along the view’s line of sight. For more information
on views, see
Views .
Relative Coordinates
To better understand the concept of relative coordinates, think of a system of satellites,
like the earth, the moon, and the sun. The moon’s parent is the earth, and the earth’s
parent is the sun. Usually, when considering these three bodies, the moon’s position is
described in terms of its position relative to the earth (the moon’s parent), and the earth’s
position is described relative to the sun (the earth’s parent). In Motion, an object’s position
and orientation are always relative to its parent.
1193 Chapter 18 3D Compositing