Francois Serra

should avoid multiplying by interval to start at 1: https://github.com/3DGenomes/TADbit/blob/master/_pytadbit/imp/structuralmodels.py#L1009

Either allowing to play with distance of the background shading, or directly slicing the model, like in chimera: http://www.cgl.ucsf.edu/chimera/data/tutorials/volumetour/volumetour.html