Depth of Field (Depth of Field / DoF) is a technical term that is extremely important in rendering and optimizing game graphics (technical art). This technology creates an overwhelming sense of depth similar to that of a single-lens reflex camera by clearly depicting only the specific object that the camera focuses on (focus position), and smoothly blurring the foreground and background that are outside of that object.
Real-world analogy: When you hold your index finger close to your eye and stare at it, the background in the background becomes blurred and appears double, and conversely, when you look into the distance, your finger in the foreground completely blurs and disappears.Focus adjustment of the human eye
Depth of field (DoF) is the extreme visual magic in which when photographing a person with a single-lens reflex camera, only the main character's face stands out clearly, while the tree-lined background and flowers in the foreground (out of focus) are beautifully blurred, as if they were melting softly like cotton candy.'' The player's attention can be focused 100% on ``important items and characters that need to be shown right now,'' and a casual game play screen can suddenly be transformed into an emotional and sophisticated piece of cinema.
Figure: Depth of Field (Depth of Field / Infographic that clearly illustrates the basic processing flow and mechanism of DoF) in Japanese notation
Detailed mechanism and operating principle
Post processing Add "Depth of Field" to the volume, set the Focus Distance, and blur the background other than the main character cinematically.