**Figure 1**
Implementation of the SAXS cylindrical sample geometry in *RADDOSE-3D* given a defined diameter, *d*, and height, *h*. (*a*) Evenly spaced points around a circle are generated given the radius, *r* = *d*/2, of the circular cross section. *RADDOSE-3D* defaults to 32 points. (*b*) In three dimensions the points represent the circles at each end of the cylinder at a distance of *h*/2 from the origin located at the centre of the cylinder. |