Split multi-soma .SWC files into separate files for each soma, and convert them to .OBJ format. Runs in linear time for large datasets.
Split somas in file named 'retinal_cells.swc' which are outputted to separate files in '/retinal_cells'
Convert to .OBJ format using conv_to_obj_robbie1977.py -- retrieved from https://github.com/Robbie1977/NRRDtools/blob/master/swc_to_obj.py