Apple Shake 4 Tutorials Bedienungsanleitung PDF herunterladen (Seite 99)

Chapter 3 Depth Compositing 99

4 In the Reorder parameters, enter “rgbar” in the channels value field. This string specifies

that red goes to the red channel, green to the green channel, blue to the blue channel,

alpha to the alpha channels, and red again to the fifth channel—the Z channel.

You now have a Z channel for the background. Next, you’ll copy this Z channel to the

city_/jointfilesconvert/1578512/bg image.

To copy the Z channel to the city_/jointfilesconvert/1578512/bg image:

1 In the Node View, select the city_/jointfilesconvert/1578512/bg node.

2 Attach a Layer–Copy node.

3 Connect the Reorder1 node to the second input of Copy1.

4 In the Copy1 parameters, enter “z” in the channels field. This copies the Z channel from

the Reorder1 node to the city_/jointfilesconvert/1578512/bg image.

Now, with the Z channels in place, you can create the composite using a ZCompose

node. ZCompose takes two images and uses the Z channel values to “stack” the RGBA

pixels by comparing which image has the lower Z value. The order in which the layers

are composited does not matter. Instead, the pixels with the higher Z values are

composited on top and passed down the tree.

To composite balloons and city_/jointfilesconvert/1578512/bg using ZCompose:

1 In the Node View, select the balloons node.

2 Attach a Layer–ZCompose node.

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Apple Shake 4 Tutorials Bedienungsanleitung Seite 99