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Tuesday, June 24, 2008

Motion and the OoO, Part 1

Mark Spencer | 06/24- 07:30 AM

A Multi-part Motion Tip

The fix is to trick Motion into reversing the order of operations: force it do the rotation first, then add the drop shadow, thereby keeping its angle fixed (in our example, at 315 degrees). And there are two ways to do it.

The quick and dirty way is to simply check the Fixed Source checkbox under the Drop Shadow section of the Inspector. This will force the shadow to be calculated after the rotation:

Now the shadow remains to the lower right even with the scissors rotated.

The second way to fix this problem is to explicitly change the order of operations by applying the drop shadow to a group containing the layer, then rotating only the layer:

1) Turn off the drop shadow for the layer.
2) Place the layer inside a group, or precompose the layer, by selecting the layer and choosing Group from the Object menu.

Now the Scissors layer is inside its own group.

3) Apply the drop shadow to the group instead of the layer.

Now, when you rotate the layer (not the group), the shadow angle gets calculated after the rotation, so it keeps the same angle.

This is because changes made to layers are calculated before changes made to the group containing the layers.

The strategy of applying transformations and effects to groups rather than layers is a powerful one. In Part 2, we’ll look at how Motion’s Order of Operations affects working with layers, transformations, and filters.

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