This PhD thesis describes the employment of PC clusters for the interactive visualization of three-dimensional polygonal models. The main objective of this work was to improve the visual quality by utilizing the combined processing power of such a cluster system. Additionally the development of new cluster based graphic applications should be simplified. It is shown, how a scene graph system must be extended, to enable efficient distributed cluster rendering. Furthermore the work describes new network protocols for an efficient data distribution in large cluster systems. On the basis of a distributed scene graph different strategies for parallel rendering are discussed. New algorithms for the parallelization were developed that are optimized for the use in a cluster environment. The work describes the parallel rendering of parts of an image and parallel rendering of parts of the scenegraph. With the new algorithms it is possible to drive arbitrary multi-projector display systems like tiled display, workbench or cave with a PC cluster very efficiently. Furthermore it is possible to visualize very large models with high frame rates.