Game Development Reference
Figure 5.58 The fractal fi re layer.
Apply the Set Matte effect to the lava layer. In the Take Matte
From Layer drop down, choose the lightning layer. By default,
the alpha channel of the lightning layer now becomes the alpha
channel of the lava layer. This essentially yields the same results
that we would have achieved had we used this lightning to create
an alpha matte. The problem is that the glow around the light-
ning creates an ugly halo (Fig. 5.59).
However, with the power of the Set Matte effect, we don't have
to be stuck only using the alpha channel of the lightning. Change
Figure 5.59 The results of
choosing the lightning layer in
the Take Matte From Layer drop