At the Institute for Visualization and Interactive Systems (VIS), a multi-volume visual­ization application was implemented and developed based on Graphics Processing Unit techniques to visualize multiple volumes in one scene. That is dorre by dynamically gen­erating pieces of shader code from pre-defined render nodes. The tool provides a user interface and special functionalities for the interactivity of the user with the visualized scene. However, extending the tool with new render nodes was still a difficult task for the programmer because of the need of deep examination of the tool's source code. For this, a generic extension concept has been applied by adding features to the applica­tion in a standardized manner to help minimizing the effort and avoiding the redundancy of the code each time a new render node is implemented and integrated to the applica­tion. These features extended the application to allow for standardization to help the programmer focus on the specific tasks to be added while keeping more general tasks transparent.