“Shadows are amazing. Lighting is amazing. Geometry is amazing. 3D reconstruction is a huge part of what I do.”
Farid has been doing this for two decades, since the Kerry-Jane Fonda fake in 2004. His method is physics. Check the shadows, check the lighting, check the geometry. The depressing part is that he is one guy. The volume of synthetic media now produced per day exceeds what any human-led forensic operation can verify, which means most fakes will simply never get checked.