Apple Shake 4 New Features - Manual (Page 98)

98 Chapter 3 Compositing With the MultiPlane Node
As a result, the balloon appears positioned between the front building and the rest of
the city in the camera view.
Because both the building and city layers are attached to the camera, they look
identical to the original input image from which they’re derived, regardless of each
layer’s position within the 3D workspace.
Attaching Layers to Locator Points
In addition to attaching layers to the camera, you can also attach a layer to any locator
point in the data cloud. This lets you quickly set a layer’s position in space to match that
of a specific feature in a tracked background plate.
When you attach a layer to a locator point, the layer is transformed to match the
position of the locator point using expressions. As a result, operations that change the
position of locator points, such as changing the sceneScale parameter, also change the
position of any layers that are attached to locator points. In addition, animated locator
points (from a tracking application capable of tracking moving subjects in addition to
backgrounds) will transform any layers that are attached to them as well.
You can attach a layer to either a single locator point, or to a group of three locator
points. Attaching a layer to a single locator point only pans the layer, it is not rotated.
To attach a layer to a locator point:
1 If necessary, move the layer’s center point to a position at which you want the layer to
be attached to the locator point.
2 Right-click a locator point in the Viewer, then choose a layer from the Attach Plane to
Point shortcut menu.
The layer is panned to the position of the locator point, and attached at the layer’s
center point. Expressions are added to that layer’s pan parameters that maintain the
relationship between the attached layer and the locator point.
A balloon image inserted between. the
front building and cityscape The resulting camera angle