Interactive Spatial Multidimensional Transfer Functions in Hardware Accelerated Volume Rendering
Ji Young Hong · 2007
Transfer functions are fundamental to direct volume rendering because their role is essentially to make the data visible. In this paper a new method is proposed to design the interactive spatial multidimensional transfer functions in hardware accelerated volume rendering,which assign color and opacity to the volume based not only on the scalar intensity of the dataset but also on the position of voxels in the dataset. The approach uses a unique spatial projection transformation to label the volume into user desired different regions,and defines the transfer functions to each region respectively. The proposed technique utilizes sophisticated graphics hardware functionality,especially the fragment program,to enable interactively select and explore regions of the volume dataset under the standard PC.