Graphics Programs Reference
In-Depth Information
Step 3: Simulate interposition
Interposition deals with overlapping images to simulate depth. The Timeline in Flash
controls the arrangement of objects, or stacking order, through layers. By default, each
new Flash document gives you a single layer to work with in the Timeline. Each layer
can hold more than one object.
Within a layer there is a stacking order. All ungrouped shape fills and lines are always
at the bottom. Grouped objects, symbol instances, and bitmaps are stacked above. You
can further control the stacking order of these elements by clicking on an object and
selecting Modify > Arrange. It is good practice to create new layers to organize your
content better. To create a new layer, click on the Insert Layer button located at the
bottom-left corner of the Timeline (Figure 2.13). Each new layer has a stacking order.
Items in a higher layer will appear on top of items in a lower layer.
Figure 2.13 Insert Layer button
Notice that this file contains two layers: a scientist and a clone layer. The clone is
on a lower layer. Click and drag the clone to the left. He now appears underneath the
higher layer ( scientist ), adding further to the illusion of depth. This demonstrates the
stacking order in Flash as well as the visual depth cue of interposition (Figure 2.14).
Figure 2.14 Interposition and stacking order
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