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# Working with Attributes

At its core, everything in Katana is about creating and manipulating attributes. These attributes, stored at locations within the scene graph, represent the information a renderer needs to render a scene, such as geometry data, transforms, or what material should be applied at a given location.

Although almost all nodes, in essence, manipulate attributes, Katana provides a number of special, general-purpose nodes that give you free reign to create or manipulate the values of any attribute at one or more locations. The most common are AttributeSet and OpScript.

• The AttributeSet node is used to create, override, or delete attributes at one or more locations.

• The OpScript node is a Lua-based interface to the Op API. The OpScript node also allows you to modify the structure of the scene graph hierarchy, such as deleting locations or creating new child locations. For more information about OpScript and the Op API, please refer to The Op API.

To learn how to manipulate attributes, refer to either:

• AttributeSet Nodes

• OpScript Nodes

• Working with Group Attributes