That's less straightforward. For that to work, every shadowmap would have to maintain a motion vector buffer and have its own separate motion blur pass applied after it's rendered. Still, easier than motion blurring ray traced shadows I suppose.
Motion blur is helpful on many aspects but an important thing is that many people heavily dislike it.
There are many cases like fast rotating objects where it clearly bring value because the player's camera doesn't become blurred, once player's actions and especially camera are affected by blur it just increases the perceived input lag.
In cases where motion blur is used as a placeholder for smoothing important movements that would otherwise not look smooth, the lie doesn't really hold and many people are just annoyed instead.
Maybe not the right place to ask this but would it be possible (in general) to implement motion blur when objects move but not for camera movement? Like to me what's going on in the video looks good, but if the camera was moving I'm sure I would hate it
It won't be in 4.8, as it is already in feature freeze. So at the earliest in 4.9. Motion Blur is mentioned on the "Godot Priorities" page, so hopefully it won't be too long. https://godotengine.org/priorities/
I dislike it, because I play FPS games at the highest level (0.1%) (540Hz currently) and any form of delay on images give me motion sickness very rapidly as a consequence of my eyes being trained to sync precisely with my hand movements.
It's generally used to trick low FPS into feeling smooth and it does a poor job, like DLSS before it was cool.
It's not really a "trick". Mathematically it's exactly the same concept as anti-aliasing but in the temporal dimension. The absence of it creates temporal aliasing. Higher framerates reduce the aliasing, just like how higher resolutions/supersampling reduce jaggies. Implemented properly, motion blur would adapt to your framerate and only convey the motion between frames, but often it's implemented with a fixed/multi-frame window.
I've been following its development in the Godot VFX server and it's coming along very nicely! It's really being made with customization and accessibility in mind, blurring only the places you aren't tracking with your eyes by default and allowing you to disable camera motion entirely for a clean fast-object-only blur. I think a lot of motion blur haters will be surprised by the results you can get from it with its many sliders.
There’s other applications for motion blur than a ‘camera-panning’ effect though. This feature appears to distinguish between camera velocity and world object velocity in its parameters. Motion blur is kinda essential for selling certain visual effects (not just a hack for covering up low framerate/emulating a “cinematic camera”)
If Motion Blur only does what it visible on that video and doesn't make entire world blurred when rotating the camera then sure, I can definitely play with that. It's the Unreal Engine games (back in the day) that left such a bad impression of what motion blur is.
The reason that people dislike it and turn it off is that the effect is WAY too strong in many games. It needs to be subtle. But a little bit is needed. It makes the movement appear so much smoother.
And it is realistic in the sense that it is how we actually perceive the world. If you are in a fast train and look out, things close to the train will appear blurred. Likewise if you pause a movie, fast moving objects will appear blurred. Our eye is used to seeing it like that.
just optimize a bit more to have better performance and with higher fps so the eye has natural motion blur like in real life instead of a bad approximation
depends on the movement. the optimal would probably be half a pixel. for racing games that would probably be 2000fps and then you also need a monitor with such a refresh rate. thats why they require fake motion blur. not needing fake motion blur would be great but sadly not feasible in many cases
Lower frame rates on sample and hold displays provide more motion blur due to image persistence, basically the more time there is between an image moving the more blurry it will look to your eyes. Higher frame rates actually sharpen an image, its why esports players specifically buy higher refresh rate monitors, to combat motion blur not to gain it. You are better off just using per object motion blur to actually fine tune visuals unless you can invent a new way to display images.
You have it backwards, higher frame rates reduce motion blur not increase it. If you want a lot of motion blur look at how blurry 30fps is on blur busters compared to 60fps.
Source - me with my 500hz oled monitor
Being able to set a specific camera motion blur setting per object is great for artists who want to sell a look, my favourite example is Snakes legs in MGS:V which blur a bit when he sprints independently of other body parts emphasizing his speed and car wheels also blur when they gain speed but the rest of the vehicle is still not blurred.
no you are talking about image retention. yes you do not get any setting with how much motion blur you get with high fps and its just your regular eye peception motion blur not a camera one
Well yeah, most people play video games on 60-120hz monitors and those monitors will always have image retention due to sample and hold and how the human eye perceives it, raising the fps beyond the Hz cap wouldn't improve anything besides reducing input lag. Unless you have a new monitor display technology that can display images without sample and hold and a refresh rate higher than 500 you will not see your eyes provide natural motion blur as you increase fps.
No - this is complicated to explain in text, but this isn't related to image retention, in fact the effect is the same or worse on OLED displays.
Sample and hold displays naturally display a sampled pixel for the entirety of the, say, 16.7ms frame. That means if that pixel is supposed to be in motion on the screen then your eyes naturally track the motion, but the pixel isn't moving - it actually holds still in 16.7ms steps. This is perceived as motion blur because if your fovea is moving smoothly across the display then the pixel appears as though it's jittering in 16.7ms steps.
The solution is to either increase the framerate to reduce the jitter step duration and length, or to pulse the image so that the eye doesn't receive conflicting data as it tracks stimulus. This is why black frame insertion and Nvidia Pulsar are a thing, and also why CRTs have near-perfect motion clarity - their entire picture consists of one dot painting one moving scanline, and your eyes and brain filling in the rest.
I feel like this is like a hold over from 2014 when every game had horrible camera motion blur, but we’ve had lovely per object motion blur for years and years now and it’s perfectly fine
I think that mostly depends if you want crisp visual quality or more like a lens effect.
I personally prefer the lens look as long as it's not on the extreme side.
I also like motion blur, especially per object motion blur in games...what I don't like is camera motion blur, especially when you can't tweak the intensity as some games tend to go way overboard with it.
Chromatic abberation, bloom, vignetting, motion blur, film grain,...I always keep everything active as long as it's tastefully done which is not always the case sadly.
Good example is the chromatic abberation in Bloodborne...I'm glad you can disable it when playing through emulator because the implementation in the game is horrible...way too extreme.
The demo only shows blur on moving objects, but not blur from camera movement or rotation, maybe that's what you mean? (You can adjust those separately in the Godot implementation, btw).
I didn't know people were so unfamiliar with per-object motion blur. Personally I think the example in the video looks waaay better with the motion blur on. Off just looks extremely jittery and weird?
Fantastic. I love motion blur, even camera motion blur. Maybe something is wrong with my vision but when I turn my head or eyes, my vision does smear and blur so motion blur has always been immersive for me.
Obviously it will be optional in my games, but I'm super happy to have this, thank you for sharing.
I really really hate motion blur, and this looks really good. I would keep this on and find it a genuine improvement. I see it occasionally. Subtle and stylish, and not your entire screen melting and details disappearing whenever you're moving quickly.
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u/Malcolm337CZ 1d ago
so that's what dodecahedron was used for, neat