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# About Source Nodes

Use source nodes in Action to create more advanced techniques such as transforming or replacing a front or matte clip or applying motion blur. Source nodes can be used to separate front and matte clips in media and then apply separate transformations to each clip. For example, if you apply media to a surface and you want to create an effect where the matte moves into the scene, add a source that isolates the matte clip. A matte source lets you animate the matte's position separately from the front. You can also use source nodes to apply several matte clips to a single front clip.

NoteWhen applying colour corrector, blur, and crop effects with source nodes, the effects are applied to the result of the source of the media. In contrast, keyer effects are applied only to the input clip of the media.

#### Topics in this section

- Creating a Matte or Front Source
- Replacing the Front or Matte Clip
- Viewing a Source Node
- Blurring with Source Nodes
- Adding Cameras