Mission
To recreate in 3D, independently from the software and without involving render-intensive physical engines, the natural phenomena where colors shift during the transition from light to drop shadow.
Answer
To create a dual light source that reacts like natural light would do.
Visual reference
The dual lighting system
Instead of lighting up a 3D scene with a light source with a single emitting point, I duplicate the light emissive source into 2 entities, offsetting colors and position.
LEFT: standard, RIGHT: dual lighting system