1. An MRI apparatus, comprising: a patient table; upper and lower magnets positioned about said table; upper and lower magnetic coils positioned about said table; amplifiers for energizing said upper and lower magnetic coils; a radio frequency detector; a digitizer responsive to said radio frequency detector for producing a dataset; and a computer having input and output devices connected thereto, said computer responsive to said digitizer, said computer programmed to operate on said dataset to perform a method comprising: defining a plurality of slicing planes through the dataset, said slicing planes being parallel to a viewing plane; interpolating density values in normalized device space for the figures generated by the intersection of the dataset with the slicing planes; and storing the density values as density textures for later use.