1. A computer-implemented method for blending two three-dimensional volumetric structures, comprising: associating a first primary color and a first translucency to a first dataset, and a second primary color and a second translucency to a second dataset, each of the first dataset and the second dataset having a respective three-dimensional surface representation; and blending the first and second datasets by visualizing the translucent surfaces of the first and second datasets to produce a blended representation of the first and second translucent surface datasets simultaneously, the blended representation including a first primary color, a second primary color, and a secondary color.