Game Development Reference
In-Depth Information
duplicating the layer several times. But remember that with the
Offset effect, we can control multiple instances of the smoke at
once. We could do the same thing with expressions, of course.
Expressions are much more powerful than the Offset effect, but
to some users, they might be more diffi cult to grasp and more
time consuming to setup than the simple Offset effect (Fig. 7.52).
Figure 7.52 The smoke layer
in the Smoke comp with two
instances of the Offset effect
applied.
The Optics Compensation Effect
The Optics Compensation effect is a unique effect in this
category. Most Distort effects distort a layer for visual effect.
The Optics Compensation effect fi xes the distortion at the cor-
ners of footage caused by certain camera lenses. So, Optics
Compensation is a distortion effect that fi xes a distortion prob-
lem. I guess in this case, two wrongs do make a right.
Open up the Optics Compensation.aep project from the
Chapter 7 folder if you'd like to follow along. This footage is
a still shot I took with a fi sheye lens over Snoqualmie Falls in
Washington State. As you can plainly see, the fi sheye lens has
caused a lot of distortion in this image (Fig. 7.53).
The Optics Compensation effect can be used in two ways. It
can add lens distortion or it can remove it. If I increase the fi eld of
view (FOV ) value to about 106, you can see the added distortion
it creates. This even shrinks the corners of the layer and creates a
pincushion effect (Fig. 7.54).
This extra distortion might be a cool trick for another day, but
right now, we need to get rid of this lens distortion not add to it.
The way to get the Optics Compensation effect to remove our
lens distortion is to select the Reverse Lens Distortion checkbox.
Selecting this option and changing the FOV value to about 70 gets
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