2011

Table Of Contents
is imported the same way it is done in the creation processsee The
Pre-Compositing Import Options
on page 306.
Note that the primary version of a render pass composition is never changed
by the pre-compositing update. It is up to you to decide which one is the
primarysee
Working with Compositions on page 217.
Render Layer Compositions
Render Layer Composition Creation
Before the render layer composition is created, render pass compositions for
the given render layer are created or updated.
With a Template If a template is specified for the render layer, its content
is copied into the render layer composition and the rest of the operations
applied to it are quite similar to what happens during an update.
The dependency graph is reviewed to find all the render pass anchor link
nodes which are updated to link to their associated render pass composition,
which was previously created or updated.
If some render pass anchor link nodes are missing in the template, new
unconnected render pass anchor link nodes are automatically added to the
render layer composition (in the same way as when no template is specified).
Without a Template If no template is specified, the render layer composition
is created with a single unconnected output node. For each render pass
composition, there is an unconnected link node that points to it.
The render pass link nodes have their anchors automatically set to their
corresponding render pass anchor name and the nodes are initially named
after their linked render pass compositions (their names are not changed by
further updates).
What Happens Next? By default, a render pass anchor link node points to
the Latest version. This is because a new render pass composition version was
added during a pre-comp file update is not automatically tagged as the primary
version. Choosing the primary render pass version is up to you. If you want
the render layer composition to be updated automatically when new Maya
render passes are imported in Composite, the render pass anchor link nodes
must point to their latest version by defaultsee
Working with Compositions
on page 217Working with Compositions on page 217.
The image format, pixel format and rate of the render layer composition are
set according to the information contained in the pre-comp file.
316 | Chapter 13 Pre-Compositing