FroyokThis weekend I added motion blur in my engine. Initially I didn't want to have this effect at all. Usually I find it ugly/noisy and makes me a bit sick. There is one game however where I actually like it: Syndicate (2012) !
In this game, the effect is only based on the camera motion, and only when moving very fast. So it triggers only in specific conditions, and doesn't impact gameplay much.
So that's what I did !
I went with the same idea: camera based only, no per-pixel velocity buffer computation at all. It's cheap also, I render it at half-resolution then composite it back up.
I went with the same idea: camera based only, no per-pixel velocity buffer computation at all. It's cheap also, I render it at half-resolution then composite it back up.
I generate mips and use textureGrad with anisotropy to make it a non-uniform blur, needing only 7 taps per pixel.
Final result is really good, and cost 0.4ms (downsample, mip, effect, blit back up).
Final result is really good, and cost 0.4ms (downsample, mip, effect, blit back up).
Ho yeah, forgot to mention: to keep it simple to integrate I run it after the depth of field, which avoid blur discontinuities at mesh edges.
This is wrong, but looks okay in motion.
This is wrong, but looks okay in motion.
LR@froyok reminds me how i once did motion blur and depth of field in a single effect (monte carlo sampling kernel changes shape)
Frans
Ronflaix
Ignacio Castaño🍉@froyok I relied on textureGrad and anisotropic level for the blur in the water reflection on the witness and was really annoyed AMD disabled anisotropic filtering at the driver level after we shipped, breaking the effect.
Andrea Dahnberg@froyok interesting! i find i prefer motion blur the other way - none on my camera movements, only on objects moving
@andicraft I think my problem with that is that it become difficult to make it look good. You have to handle sample rejection for objects moving behind static ones, dither in case an object motion is too wide, etc.
Plus during gameplay I like being able to still easily track moving target.
I guess it's a matter of taste and habits. :D
@andicraft I guess I focus on the "I'm moving fast" vibe instead of "that object is moving fast". 😄