Method for processing 3D input image data for a display of images on at least one display unit (29, 32, 35, 36, 37) in a motor vehicle, wherein - the 3D input image data are provided scene-by-scene in accordance with an associated 3D image scene (19, 20, 21) by client applications (16, 17, 18), - 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 (19, 20, 21) are superposed at least partially and a whole 3D scene is formed and managed, - a plurality of 3D output scenes (33, 34, 40) 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 (27, 30, 38, 39), which is associated with the display unit (29, 32, 35, 36, 37), for producing target image data that are adapted to the display unit (29, 32, 35, 36, 37), - the client applications (16, 17, 18) in each case generate security parameters associated with the 3D image scenes (19, 20, 21), 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 (19, 20, 21) 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 (33, 34, 40) are structured in such a way that, as the target image data are generated in the rendering unit (27, 30, 38, 39) at a target image coordinate, those image target data that are derived from a 3D image scene (19, 20, 21) 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 (19, 20, 21) by client applications (16, 17, 18), - 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 (19, 20, 21) are superposed at least partially and a whole 3D scene is formed and managed, - a plurality of 3D output scenes (33, 34, 40) 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 (27, 30, 38, 39), which is associated with the display unit (29, 32, 35, 36, 37), for producing target image data that are adapted to the display unit (29, 32, 35, 36, 37), - the client applications (16, 17, 18) in each case generate security parameters associated with the 3D image scenes (19, 20, 21), 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 (19, 20, 21) 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 (33, 34, 40) are structured in such a way that, as the target image data are generated in the rendering unit (27, 30, 38, 39) at a target image coordinate, those image target data that are derived from a 3D image scene (19, 20, 21) of a higher priority stage superpose target image data derived from a lower priority stage.