Fig. 1. Diagram of the underwater light field

Fig. 2. Underwater light field from the sun

Fig. 3. Formation of underwater spherical illuminance

Fig. 4. Iterative solution flow chart of the underwater light field

Fig. 5. Iteration curves of the underwater light field from the sun

Fig. 6. Illuminance on the surface with the sky as the background

Fig. 7. Iteration curves of the underwater light field with the sky as the background

Fig. 8. Underwater initial light field by an underwater point light source

Fig. 9. Underwater initial light field by an overwater point light source