The effectiveness of the bounding volume method as a useful approach to achieve a real-time frame rate on rendering large volume data is widely accepted. The bounding volume method belongs to the space leaping technique, in which the objects pertaining to the volume data are enclosed within geometry objects of various shapes in order to delimit the range of effective calculation, thus avoiding useless calculation. This method is expected not only to be useful as a preprocessing stage for acceleration of volume rendering by Ray-Casting and Splatting, but also, for volume rendering using Texture-Mapping, which is currently gaining attention. In this report, we describe the positioniong of our proposed boundary-projection technique within the bounding volume method as well as some possible enhancements to support transfer function changing without considerable
performance degradation.