| 23 | 23 | This source term takes the value of the clump density (perturb) and subtracts from it the density of the background density (q(1)), where background here means the ambient object "behind" the clump object. The f is a fading factor that is used within a smoothing region between clump and ambient object. If one is fully within the clump (and outside of the smoothing region), then f=1. The value of the density is then assigned by rho=q(1)+s(1)=perturb. If, on the other hand, one is fully outside of the clump, then f=0, and rho=q(1)+s(1)=q(1). Within the smoothing region, some value between 0 and 1 is used to fade the density between these two objects. |
