This thesis describes methods for advanced visualization of 3D data. Order-independent transparent data between multiple datasets of varying types can be combined using an A-buffer. In this thesis, an implementation of such a buffer is presented. An optimisation of the A-buffer, based on the discarding of unnecessary fragments will be presented. A line integral convolution method for 3D volumes will also be presented, where noise input, and resolution of the input- compared to output volumes will be discussed. The resulting method is able to visualize multiple types of data with order-independent transparency. The rendering speed is generally fast enough for an interactive user-experience.