Why does camera blur, especially close up characters, always look unnatural in games?

This problem stems from the specific way game engines implement bokeh, using the Unreal Engine 4 that I'm familiar with. First of all, it's clear that the so-called "bokeh" is the image blurring effect that occurs when a scene is captured outside of the focal length of the lens when shooting with an analog camera. In games, it is used to create a visual sensation similar to a movie, or to designate a focused object to keep the player focused on a specific object.

This effect is called "depth of field" (DOF) in game engines, and as mentioned above, depth of field is a tool. It can simulate the effect of a camera lens or attract the player's attention, rather than simulating real visuals, where the human eye can only clearly see a small part of the center of the field of view, but the human eye zooms in. Soon, the visual center of the brain interacts with the eyes for image processing, which actually makes the depth of field invisible.

Normally, where the human eye sees, it will quickly zoom to the correct state for clear imaging. Unless it is too close to the human eye, the human eye has physical impairments such as nearsightedness and farsightedness, so there is no depth of field, therefore, the depth of field mentioned here should be as natural as possible, which means that the depth of field effect should be as close as possible to the effect of objects outside the focal length of the camera.

It is easy for game engines to get the distance between an object and the camera, in theory. As long as the set focal length is applied, a certain degree of blurring can be applied to objects outside of focus, thus simulating objects This is the simplest implementation of Unreal 4: Gaussian DOF - named after the Gaussian blur method it uses.

So sometimes after blurring, when you look at the characters after zooming in, you will feel weird.

If the characters are too clear and the resolution is too high, then many computers will not be able to move the game, which is for the sake of the player.

It's hard for me to ask this question.,The lens blur is blurry, right?,Is this what it looks like? So it's not natural.

This has something to do with the design of the game itself, and if the bokeh mode that the game says to you doesn't exist, then your own bokeh will lead to conflicts.

This has something to do with the game's production screen.,There are a lot of games with a bad sense of picture now.。

It's not very clear.,Maybe it's because the game's engine isn't doing it well enough.,It should be.。

Because this belongs to the game engine and can't be fully bokehed, this will happen.

This is a game engine that can't be fully bokehed.,It's related to the design of the game itself.。

Because of the visual impact, it may also be that the overall structure and proportions are not appropriate, so it looks unnatural.