Game Development Reference
In-Depth Information
Note that every pixel seen in Fig. 20.20 is either from the Seattle
clip or the Artbeats clip of children. We're not seeing any of the
actual pixels of the Rad Rockets clip. The Rad Rockets clip is only
being used to determine what pixels are seen from which layer.
Figure 20.20 Using the same
settings as Fig. 20.19, but with
video clips.
The Iris Wipe Effect
The Iris Wipe effect is quite unusual. It creates a transition by
essentially creating a transparent geometric shape on the top
layer. Once the shape is larger than the layer, the transition is
complete. This is the only Transition category effect that doesn't
have a Transition Completion value, and as a matter of fact, no
talk of transitioning in this entire effect. The parameters make
it look more like a Generate category effect. The difference here
is that the effect is not generating a shape, it's creating a hole in
the layer.
To explore this effect, we'll be using the Transitions.aep project
in the Chapter 20 folder. Apply the Iris Wipe effect to the magenta
solid in the Basic comp. To see any of the features of the Iris Wipe,
you'll need to increase the Outer Radius value. This creates a
triangle-shaped hole in the layer. To fully transition to the layers
beneath, just increase the size of this shape until it completely
removes the layer it is applied to (Figs. 20.21 and 20.22 ).
Another important characteristic of the Iris Wipe effect is the
Inner Radius. However, the Inner Radius value is not used until
you select the Use Inner Radius checkbox. You can increase the
number of points to create a star by increasing the Iris Points
value. You can rotate the shape, move it around, or feather it
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