1. A computer-storage medium having instructions stored thereon for execution by a processor to perform a method for generating a representation of a mesostructure for use in rendering a synthesized image, the method comprising: calculating both an entrance distance and an exit distance when the voxel is located outside the mesostructure, where the entrance distance is measured from the voxel to a closest intersection of the mesostructure along a desired view direction and the exit distance is measured from the voxel to a farthest intersection of the mesostructure along the desired view direction; and determining a value for each voxel of a volumetric texture of the mesostructure based, in part, on both the entrance distance and the exit distance, wherein the value represents a jump distance for the voxel along the desired view direction when a model is decorated with the mesostructure.