def __init__(self,
universe_material,
nbins,
diameter=100.,
detector_width=100.,
detector='plane'):
self.universe_material = universe_material
self.geometry = Geometry()
self.source = np.array([-diameter / 2., 0.])
if detector == 'plane':
self.detector = DetectorPlane([diameter / 2., 0.], detector_width,
nbins)
elif detector == 'arc':
self.detector = DetectorArc(self.source, diameter,
detector_width / 2.,
-detector_width / 2., nbins)
