Lens distortion

readme.md

@@ -189,10 +189,11 @@ and targets to DN through `Renderer`, and the CLI renders scene files. Lighting
 L1 draws Earth's surface from Blue Marble and the Moon's from the LRO Camera's
 map, shadows on the target, light from Earth and the Moon on it, eclipses on
 Earth and the Moon, and the Sun's limb darkening. Camera C1 is under way: so
-far, pixels that collect light over their area, and lens blur (a Gaussian
-PSF) applied to the scene rendered 2 x 2 finer than the pixels. Planned, in order:
+far, pixels that collect light over their area, lens distortion
+(Brown-Conrady), and lens blur (a Gaussian PSF) applied to the scene
+rendered 2 x 2 finer than the pixels. Planned, in order:
 
-- Camera: lens distortion, apparent positions, stars,
+- Camera: apparent positions, stars,
   detector noise, pixel-to-pixel variation, saturation and blooming.
 - Lighting: BRDF and spectral materials, atmospheric scattering, clouds, lunar
   terrain.