Rendering hair in computer graphics is complex because accurately simulating every strand would be computationally prohibitive; instead, approximations are used to capture the overall effect of hair.

Getting human faces right in computer graphics involves the interplay of numerous systems; if any aspect is incorrect, it can lead to an uncanny valley effect, making the representation feel off.

Humans are the most challenging aspect of computer graphics due to our evolved ability to detect patterns, faces, and emotions, which makes capturing realistic human representations difficult.

Rendering objects at extreme close-up and far away distances requires generating the right amount of geometry to be indistinguishable from reality without excess.

The subtlety of human expressions, such as the difference between a real smile and a fake smile, is essential to capture in computer graphics, as it conveys deep emotional nuances.

Creating realistic human faces in computer graphics requires advanced hardware and techniques, including high-resolution video capture and understanding the nuances of facial expressions and muscle movements.

Lumen, the lighting system in Unreal Engine, calculates light interactions across the entire scene, allowing for realistic global illumination that mimics how light behaves in the real world.

Dynamic lighting in Unreal Engine was achieved through approximations rather than brute force calculations, allowing for real-time effects like torch flickering and shadows.

The realism in computer graphics comes from the collaboration of artists and technical artists who build environments, utilizing multiple technical features that work together to create stunning visuals.