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# Using the Viewer

Katana's Viewer is Hydra-powered, providing a fast and flexible way of previewing locations in the scene graph.

The Viewer tab provides one or more 3D windows into the scene described by the scene graph. Only locations that are exposed within the Scene Graph tab are represented in the Viewer - the exception being pinned locations.

You can interactively modify parameters, on some nodes contributing to a scene graph location, using Manipulators within the Viewer. The manipulators available vary depending on the scene graph location selected, and the nodes that created it.

To access the Viewer, navigate to Tabs > Viewer.

The Viewer incorporates Lighting Tools, an enhanced lighting environment for artists. For full information about Lighting Tools workflows, see Lighting Tools.