text: Title: Convert colored mesh to volume
  Body: Hi, given a mesh with colors appointed to each vertex, how can I convert it into a volume (voxel format) with the colors of the voxels relating to these points. Is there a simple way to achieve this? My purpose requires taking either the nearest point as the color, or the most frequent color within the space of the voxel.
  Thanks.
  
  Note that I currently use `mesh.binarize(spacing, fg_val=1, bg_val=0)` but this (obviously) doesn't convert the colors into voxel metadata. 