What is the concept of motion blur in games?

"Motion Blur" is an option in many game screen settings now, but many players are extremely disgusted with this setting. Let’s not care whether we like this thing or not, but let’s talk about what’s going on. Movies and videos inherently have a motion blur effect. In fact, everyone can understand this easily. If we pause the high-speed moving part of the movie, we will see that the picture is blurred in a certain direction, and this blur is the motion recorded by the camera. information. It is precisely because of this motion information that objects moving at high speed can appear coherent at 24 frames. Even many cartoons drawn frame by frame will deliberately draw this kind of dynamic blur to achieve a coherent effect. The opposite case is stop-motion animation. I believe everyone has seen "Avanti". "Avanti" is a typical stop-motion animation, that is, a type of animation in which you take a photo by posing an action, then fine-tune the action in the next frame, take another photo, and then connect all the photos to play. In reality, it is impossible to achieve motion blur when posing, and at that time, there was no post-processing technology to add motion blur, so even though the frame number of the stop-motion animations you see is 24 frames, there is always a kind of lag. feeling. Of course, there are certain reasons why the position of human hand adjustment movements is not accurate enough, but it is enough to prove the role of dynamic blur.

The game has not had the effect of motion blur for a long time, which means that the images generated in each frame of the game are extremely clear, just like stop-motion animation. Therefore, if it is still 24 frames, there will be a feeling of lag, so at least 30 frames can be barely smooth. This is the first reason why the game needs at least 30 frames to be qualified. In fact, even if it is 30 frames, in high-speed changing scenes, such as racing games or quick camera changes, you will still feel stuck. Therefore, in the past few years, game development companies have added the motion blur effect, just to make 30 frames or even longer. When it is low, it can produce a smooth effect like a movie. The actual effect is also very obvious. At 30 frames, it is indeed more comfortable with motion blur than without motion blur. We used software to limit the picture of "The Witcher 3" to 24 frames to compare with and without motion blur. Motion blur does make the picture smoother.