Abstract: After the hidden surfaces algorithms for 3D rastergraphics, hardware design is the main problem, for many applicat ions, such as : Audiovisual animat ions. CADCAM, and simulation.After a short description of our CUBI 7 system (a 3D real-time Z-buffer system), and its CRISTAL module which increases RAY-TRACING computations, we present our hardware project based on :-Parallel architecture for RAY-TRACING, special effects; This module is also useful for pre-processing the image : (rotations, clipping, perspective transform... ).-A or Z-BUFFER which will be designed on VLSI chips polygon filling will be also designed with pipe-lined chips.