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GeForce-Exclusive Anti-Aliasing Modes And Driver Settings

Anti-Aliasing Analysis, Part 1: Settings And Surprises
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Obsolete GeForce Anti-Aliasing Modes

Quincunx Anti-Aliasing

When the GeForce 3 was introduced, Nvidia included a new anti-aliasing option in the driver: Quincunx.

Quincunx anti-aliasing didn’t take additional samples within each pixel, but duplicated the frame buffer, shifted the duplicate diagonally by half a pixel, and made use of these duplicated pixels to average out the colour of the pixel in the centre and create an AA effect. While Nvidia said quincunx anti-aliasing offered 4xAA quality with a 2xAA performance load, in reality, the method often blurred both edges and textures alike. It’s been referred to as a blur filter, which also isn’t really correct (though it's not too far from what is actually happening).

We’re listing this mode for reference purposes, as it was removed from Nvidia's drivers a while ago due to its relatively poor quality. Quincunx was dropped once graphics hardware was fast enough to handle MSAA. You can learn more about Quincunx in our GeForce 3 review (written by good ol' Thomas Pabst).

Driver Settings: GeForce Anti-Aliasing Controls

The Nvidia control panel is relatively easy to use, although its settings often don’t work as simply or intuitively as you’d expect based on the labels. To access the anti-aliasing controls, click “Manage 3D Settings” under the 3D Settings right below the “Select a Task…” menu.

Here you see the three main anti-aliasing controls: “Antialiasing–Mode,” “Antialiasing–Setting,” and “Antialiasing–Transparency.” By default, the first two are set to “Application-controlled,” and the third is set to “Off.”

We’ll start with the “Antialiasing–Mode” setting. The options are as follows: “Application-controlled,” “Off,” “Enhance the application setting,” and “Override the application setting.”

Setting “Antialiasing-Mode” to “Application-controlled” surrenders anti-aliasing levels to the application. The “Off” option disables the feature entirely.

The next two settings are a little more complex. The “Enhance the application setting” option should change the anti-aliasing level in the game to the driver-set anti-aliasing level chosen in the “Antialiasing–Setting” option just below. For instance, if your game's menu options max out at 2xAA, you would set 2xAA for the game and force the 16x setting through the driver for improved anti-aliasing. Realistically, these controls might only work in DirectX 10 and 11 titles if the MSAA level you’ve set in-game corresponds to the number of samples in the anti-aliasing level you are trying to force in the driver. For example, if you set 4x MSAA in the game, you could force the 8x setting (four samples and four coverage samples) but not 8xQ (eight samples). We discuss this more in our testing.

The “Override any application setting” option should force the driver-set anti-aliasing level, regardless of the in-game settings. This mode sounds like an all-encompassing master switch, but in reality only works in a handful of scenarios, usually where anti-aliasing is not supported in the game options at all. We dig into this later, as well.

The “Antialiasing–Setting” option is closely tied to the previous “Antialiasing-Mode” setting. This is where you would choose the level of anti-aliasing that corresponds to the number of samples you’d like to use. You might have to do a little research to understand exactly how many multi- and coverage samples each setting corresponds to, as Nvidia has taken liberties with naming its anti-aliasing levels (mentioned on the previous page).

Finally, let’s look at the "Antialiasing–Transparency" setting, which turns on TAAA. This includes the options "Off," "Multisample," and "2x, 4x, and 8x Supersampling."

The “Off” setting is self-explanatory. The Multisampling setting will apply TAAA to transparent textures at the same number of samples that are currently being employed with standard MSAA—however, this mode only works in DirectX 9. The transparent supersampling settings function independently of MSAA, and tend to work in a much larger range of applications. In our testing, this feature often didn’t work in DirectX 9 titles, with much better success in DirectX 10 and 11.

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