After setting up your render layers and creating your render passes in Maya, you may want to export your elements to be composited in Composite.

1. Select Render > Export Pre-Compositing. The Export Pre-Compositing window appears.
2. The Export Pre-compositing editor is divided into three tabs: Cameras, Render Layers and Render Passes. Select the appropriate tab depending on the elements that you want to export.
3. Use the icon to expand the render layer, render camera, or render pass hierarchy and select the elements that you want to export. A icon indicates that all elements are being exported and A icon indicates that only partial elements are being exported.
4. Enter a scene anchor name in the Pre-Compositing Scene Anchor field. Composite uses the scene anchor name to identify the elements that should be included in the composite. If a composite with the specified anchor name does not exist, Composite builds a new one and adds to it all the elements with the same scene anchor. Otherwise, if the composite already exists, it is updated and all elements with the same scene anchor are included in the composite.
   Note

   Unlike the scene name, which can change, for example, from version one to version two, the scene anchor does not change. It uniquely connects a Maya scene to a scene composition in a Composite project. All elements that belong to the same composite, for example, cameras, render passes, render layers, and so forth, should have the same scene anchor. A scene anchor is only required if you plan to updated your scene compositions in Composite.

5. Click the Export All or Export Selection button to export your render layers, passes and cameras to Composite. The Export PRECOMP file window opens that allows you to enter a filename for your exported file.