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BF3 Post AA?

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zod96

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Does Post AA add anything visually to the game other then getting rid of jaggy edges? Does it make things look better or is it just a way to smooth edges?
 
axl2000 said:
well yes :) with medium or high image is blurry as hell...
Click to expand...

Low-medium takes JUST the right edge off of text and non-focused objects that it makes focusing on the game much easier.

I usually hate AA, this post implementation however, works wonders. Better player with it than without.
 
It(deferred AA) does use a lot more GPU power, but does not decrease CPU load. You'll just be limited by your GPU that much faster.
 
SicKlown42012 said:
It does use more GPU power(extremely little though), but does not decrease CPU load.
Click to expand...

Preeeetty sure it's the opposite. Post AA is a filter applied to the whole image, typically as a single pass. The advantages are it avoids engine limitations because it's closer to a photoshop filter than mathematical equations for red and blue sub pixels, but is typically of lower quality when it actually comes to staring at something with huuuuge aliasing issues.

I could be completely wrong. I read about how it worked in on article on [H] but that was many moons ago.
 
So if my projector is slightly out of focus then I don't need post-AA? :D
 
Post AA is FXAA on the PC version, it's fast and generally works pretty well. There's advantages and there's shortcomings, but IMO it does a really good job in BF3 of ridding jaggies while being really cheap on performance.

I like it on Low
 
I3eyond said:
Does deferred AA take the load off the CPU and put it onto the GPU?
Click to expand...

Post-AA is done off the GPU as well, just in case you thought post was done on CPU whereas deferred is done on the GPU.

Deferred-AA is much more demanding than Post-AA for roughly the same AA performance. Typically speaking you can roughly compare medium-high FXAA or MLAA as 4xMSAA, whereas it takes less of a performance hit than 2xMSAA. Check the [H] comparisons done in the past for instance for data regarding this.
 
I appreciate the info in this thread. I'm going to double check to make sure mine is set to low per the advice. :)
 
Also what exactly is Raw Mouse Input? I've tried it both ways and notice no difference. Does it increase or decrease frame rates at all?
 
Raw Mouse Input is to bypass any mouse acceleration that might be applied by Windows. For some people with stuttering, turning it off seems to help alleviate it. I've also noticed no difference, but I've already disable mouse acceleration in Windows.
 
If you've got acceleration disabled in windows, disabling raw input cleans it up a tiny bit. A few sensitivity changes helped my game a lot.
 
As far as this particular game is concerned.

FXAA (post-processing): Post-processing shader (pixel shader). After an image is rendered FXAA finds edges in the image and blurs them. It has almost no performance hit but does an excellent job at removing aliasing on everything. Low/medium/high sets the amount of blur. Setting it too high can cause the scene to lose some detail (over blurred).

Deferred multisampling: Extremely demanding on performance, 4x can cut your framerate in half and make the game virtually unplayable on even the most powerful graphics cards. Leave it off if you don't have multiple GTX 570/580 in SLI. For some reason it's far more demanding on AMD GPUs than Nvidia GPUs. It does a good job removing aliasing on your gun and other very close objects but seems to be completely ineffective at removing aliasing on anything that isn't extremely close to you. It also increases your vram usage a lot, with 4x adding another 300MB to the size of the framebuffer/G-buffer.

Source: http://www.tomshardware.com/reviews/battlefield-3-graphics-performance,3063.html
 
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