Method for processing 3D input image data for a display of images on at least one display unit in a motor vehicle, wherein - the 3D input image data are provided scene-by-scene in accordance with an associated 3D image scene by client applications , - the 3D input image data are fed to a scene processing unit for management and processing, - the 3D input image data are processed scene-by-scene in the scene processing unit , wherein at least two 3D image scenes are superposed at least partially and a whole 3D scene is formed and managed, - a plurality of 3D output scenes are derived from the whole 3D scene , with the superposition taking place in each case in accordance with a perspective viewing location, and 3D output image data being produced in the process, - wherein the 3D output image data are supplied to at least one rendering unit , which is associated with the display unit , for producing target image data that are adapted to the display unit , - the client applications in each case generate security parameters associated with the 3D image scenes , which security parameters in each case specify a priority stage, and wherein a priority stage in each case specifies the extent to which the associated 3D image scene remains visible when superposed by another 3D image scene, - wherein the 3D input image data are in each case associated with one of at least two priority stages, and - wherein the 3D output scenes are structured in such a way that, as the target image data are generated in the rendering unit at a target image coordinate, those image target data that are derived from a 3D image scene of a higher priority stage superpose target image data derived from a lower priority stage. - the 3D input image data are provided scene-by-scene in accordance with an associated 3D image scene by client applications , - the 3D input image data are fed to a scene processing unit for management and processing, - the 3D input image data are processed scene-by-scene in the scene processing unit , wherein at least two 3D image scenes are superposed at least partially and a whole 3D scene is formed and managed, - a plurality of 3D output scenes are derived from the whole 3D scene , with the superposition taking place in each case in accordance with a perspective viewing location, and 3D output image data being produced in the process, - wherein the 3D output image data are supplied to at least one rendering unit , which is associated with the display unit , for producing target image data that are adapted to the display unit , - the client applications in each case generate security parameters associated with the 3D image scenes , which security parameters in each case specify a priority stage, and wherein a priority stage in each case specifies the extent to which the associated 3D image scene remains visible when superposed by another 3D image scene, - wherein the 3D input image data are in each case associated with one of at least two priority stages, and - wherein the 3D output scenes are structured in such a way that, as the target image data are generated in the rendering unit at a target image coordinate, those image target data that are derived from a 3D image scene of a higher priority stage superpose target image data derived from a lower priority stage. <EOS>