The following reasons speak for preparing for pre-composing: Keep two layers in sync. If you ever make the same settings on two different layers in the same composition, it may be a signal that the layers now contain one element and you need to precompose. As a solution for renderorder problems. Sometimes it is simply not possible to perform a render action without pre-composing before another.
For example, if you want to mask a layer after applying effects to it, you need to apply the effects to a pre-composition and then mask it. To keep the master composition in order , it should be self-explanatory. A master composition with six well-organized elements is much more useful than one with dozens of different elements. Reusing an element. If you have used a set of layers to create an element that you think could be reused or that your customer wants to change globally in several places, it makes sense to nest those layers as a composition.
In this way, you can reuse the element by simply dragging it into a new timeline. Because an element or set of layers is essentially executed. Options and Gotchas.
Typical errors that occur with this process include Changes the duration and offset of the layers as they appear in the Timeline. It is not intended that some attributes need to be pre-compiled, but not all. It is difficult to undo the pre-composing of multiple edits. The behavior of precomposten blend modes and 3D transformations changes depending on whether the compression transformations are on or off.
Confusion about recursion: In what cases do motion blur, frame blending, and compressed transformation switches affect nested subcomponents?
Confusion in Layer Duration. In the precompiler, move the time needle to the first image that contains all the data. Select all layers and move them while holding down the Shift key so that the first frame appears as the first frame of the composition. If the time needle is still at the beginning of the layers, return to the main composition.
Press the [ button to reposition the first image of the composition. The missing option. Close-up: Undoing a pre-composition. Data transmission. The time component. Close-up: Extending boundaries.
Designers who are familiar with other applications often forget to pay attention to the frame rate settings when they import an image sequence. Create a new composition from scratch. Embed a composition at one frame rate into another at a different frame rate. Close-up: Collapsing new mixes. The Advanced tab. Thank you for visiting.
Notice that the layer is now a composition within the original composition, and a new composition has appeared in your project window. If you still want to manipulate the original layers, double-click on the new composition in the project window.
That will bring you inside the precomposition, and the layers will now be available for manipulation. To nest , this is simply done by selecting two or more compositions from the Project panel and dragging them into your Composition panel. Submit a technology support request No account or having problems logging in?
Request help as a guest. After a layer has been rendered, rendering begins for the next layer. The rendered layer below may be used as input to the rendering of the layer above—for example, for determining the result of a blending mode.
If a composition contains other compositions nested within it, the nested composition is rendered before other layers in the containing composition. To have such an effect operate on a masked layer, pre-compose the layer with the mask applied, and then apply the effect to the pre-composed layer. See About precomposing and nesting. If the Collapse Transformations switch is selected for a nested composition, then the transformations for the nested composition are not performed until after the masks and effects for the containing composition are rendered.
This render order allows the transformations for the nested composition and the containing composition to be combined—or collapsed —and performed together. The same is true for vector layers that are not continuously rasterized.
Instead of a Collapse Transformations switch, vector layers have a Continuously Rasterize switch in the same location. Vector layers include shape layers, text layers, and layers with vector graphic files as the source footage. Text layers and shape layers are always continuously rasterized. Collapsing transformations can, for example, preserve resolution when a layer is scaled down by half in a nested composition, and the nested composition is scaled up by a factor of two in the containing composition.
In this case, rather than performing both transformations and losing image data in the process, one transformation can be performed—doing nothing, because the individual transformations cancel each other. If transformations are not collapsed, a nested composition that contains 3D layers is rendered as a 2D image of the 3D arrangement, using the default composition camera.
This rendering prevents the nested composition from intersecting with 3D layers, casting shadows on 3D layers, and receiving shadows from 3D layers in the containing composition. The nested composition is also not controlled by the cameras and lights of the containing composition. If transformations are collapsed, the 3D properties of the layers in the nested composition are exposed to the containing composition. Thus, the nested composition can intersect with 3D layers, cast shadows on 3D layers, and receive shadows from 3D layers in the containing composition.
The containing composition's camera and lights can also control the nested composition. Essentially, collapsing transformations for a nested composition tells After Effects to not flatten and crop the layers in the precomposition. Because an adjustment layer operates on the composite of all of the layers beneath it within the same composition, an adjustment layer within a nested composition with collapsed transformations will force the flattening and cropping that collapsing transformations would normally prevent.
When a closed mask with mask mode other than None , a layer style, or an effect is applied to a nested composition with collapsed transformations, the layers in the nested composition are first rendered on their own, then masks and effects are applied, and then the result is composited into the main composition.
This rendering order means that the blending modes of the nested layers are not applied to any underlying layers in the main composition, and that 3D layers above and below the collapsed layer cannot intersect or cast shadows on each other. Chris and Trish Meyer explain collapsing transformations and continuous rasterization in this article on the ProVideo Coalition website.
Legal Notices Online Privacy Policy. Buy now. Precomposing, nesting, and pre-rendering Search. About precomposing and nesting. Uses for precomposing and nesting. By precomposing and nesting, you can do the following: Apply complex changes to an entire composition - You can create a composition that contains multiple layers, nest the composition within the overall composition, and animate and apply effects to the nested composition so that all the layers change in the same ways over the same time period.
Reuse anything you build - You can build an animation in its own composition and then drag that composition into other compositions as many times as you want. Update in one step - When you make changes to a nested composition, those changes affect every composition in which it is used, just like changes made to a source footage item affect every composition in which it is used.
Alter the default rendering order of a layer - You can specify that After Effects render a transformation such as rotation before rendering effects, so that the effect applies to the rotated footage. Add another set of transform properties to a layer - The layer that represents the composition has its own properties, in addition to the properties of the layers that it contains.
This allows you to apply an additional set of transformations to a layer or set of layers. Preferences and composition settings that affect nested compositions. Online resources about precomposing and nesting. Precompose layers. Select one of the following:. Effects can include masks and effects of other layers. For effects with layer properties, open the Input Parameter menu to the right of the layer selection choose the target input layer such as: Source: targets only the source of the layer.
Masks and effects are ignored. Masks: targets the layer after its masks are applied. Effects are ignored. Opening and navigating nested compositions. After Effects provides several ways to open a nested composition precomposition :.
Double-click the composition entry in the Project panel. Double-click a precomposition layer in the Timeline panel. Alt-double-click Windows or Option-double-click Mac OS to open the precomposition layer as a layer in the Layer panel.
Use the Composition Navigator. Use the Composition Mini-Flowchart. The Composition Navigator.
0コメント