2011

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contains an arbitrary number of anchor link nodes that source an arbitrary
dependency graph.
The anchor link nodes in a template can be unconnected or linked to existing
compositions; the link is simply replaced when the template is used to create
a composition.
A template has at least one output (the primary) which is typically the final
look of the render layer or scene. However, you can add an arbitrary number
of secondary outputs to the template.
Template Types
There are three types of templates that you specify in the Pre-Compositing
Import Options dialog box during import: layer, scene, and merge.
Layer Template
The layer template assembles passes from a single layer. This is the default
template provided with Composite. For example, the following shows the
default Maya 2011 layer template provided with Composite. Its link nodes
have render pass anchors that match the default name of the standard render
passes in Maya 2011.
Because the layer template assembles passes from a single layer, the render
layer template composition must contain link nodes with a render pass anchor
on themsee
Pre-Compositing Anchors on page 308. On render layer templates,
the render passes are assembled to reflect the shaders network in the 3D
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