44 lines
2.1 KiB
Markdown
44 lines
2.1 KiB
Markdown
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# Unity URP Temporal Anti-Aliasing
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This is a Temporal Anti-Aliasing (TAA) solution for Unity's Universal render pipeline. URP does not have a TAA solution yet, so this may solve aliasing issues for devs using URP.
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NOTE: URP does not support true motion vectors, so we rely on Neighborhood Clipping to deal with objects in motion. It should be fine though when the game runs at 60+ FPS, but this can definately depend on the use case.
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This implementation is based on the Siggraph2014 talk by Brian Karis:
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High Quality Temporal Supersampling
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https://de45xmedrsdbp.cloudfront.net/Resources/files/TemporalAA_small-59732822.pdf
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## Limitations
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- Some pixel flickering at thin lines
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- Does not work with active MSAA
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- Only one camera with TAA is supported at the moment
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## Comparison
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You can easily see that FXAA is more or less a blurry mess everywhere. SMAA is much cleaner but still has issues with very thin details, like the rope.
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TAA fixes those issues and efficiently super samples the details of the image.
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A Video is available on my youtube channel:
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https://www.youtube.com/watch?v=0D_8q_3q0_s
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## Usage
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- Render Pipeline Asset:
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- Make sure MSAA is disabled
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- Enable Depth / Opaque Textures
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- Camera:
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- Disable any anti-aliasing method on your camera
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- Renderer Asset:
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- Add Temporal AA Feature to your renderer
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- Done!
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### Suggested Settings
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- TemporalFade: 0.95 -> Lower leads to the current value being more represented in the final image, but more jittering is visible.
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- MovementBlending: 100 -> Higher leads to more aggressive pixel rejection
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- UseFlipUV: Sometimes, post processing and other settings flip the image. Toggle this to fix upside down results.
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A Halton length of 8 should be enough (roughly 8x super sampling), larger values seem to make the jittering more obvious.
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## Requirements
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- Unity 2021.2+ with URP 12 -> Should also work with most other versions, I just didn't test it.
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- Unity.Mathematics (https://docs.unity3d.com/Packages/com.unity.mathematics@1.1/)
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