Comparison of the UV-to-optical continuum escape fraction derived from our code with the results of Witt & Gordon (2000). The clumpy shell geometry studied here is built on a Cartesian grid of N = 30³ cells and is characterized by the following parameters: FF = 0.15, n_IC/n_C = 0.01, R_min = 5, and R_max = 15. The evolution of the escape fraction at 25 different wavelengths is shown, from λ = 0.1  μm to λ = 30  μm, assuming three different dust optical depths τ_V in the shell structure (measured in V band): τ_V = 2, 4.5, and 8. The escape fractions obtained with MCLyα are marked in red, whereas those obtained by Witt & Gordon (2000) are marked in grey. We find very good agreement with Witt & Gordon (2000).