Individually selected isotropically distributed photon trajectories emitted by a point source at h = 5r_g, x = 2r_g. The BH has a spin of a = 0.998 and is located at x′ = 0,  y′ = 0,  z′ = 0. The event horizon is illustrated in black. The accretion disk plane is z′ = 0. The dark red ring is the primary source after axial averaging. Red trajectories plunge into the BH, green trajectories escape the system, and blue trajectories hit the accretion disk, where they will be reflected. The point source is rotating in the direction denoted by the dark red arrow with a velocity v_φ as given by Eq. (7). We also display the corresponding spherical coordinates of the source, (r, θ), related to (h, x) by Eq. (4).