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AntiAliasing

Adds modern anti-aliasing and sharpening to RimWorld. Smooths jagged edges on sprites and terrain. Anti-aliasing runs on the GPU after the simulation, so it has no impact on TPS. Works with any texture or graphics feature.

• FXAA: Fast Approximate Anti-Aliasing. The cheapest option.
  
• SMAA: Subpixel Morphological Anti-Aliasing. Sharp, clean edges; a faithful port of the reference implementation. Recommended.
  
• SSAA: Supersampling (1.5x / 2x / 4x). The highest quality - antialiases textures too, not just edges. The heaviest option.
  
• CAS RGB & Luma: Contrast Adaptive Sharpening, applied after AA to restore detail.
  
• Quality presets + Advanced Settings: A simple quality picker per method, with an Advanced toggle for fine-grained controls.
  
• Negligible CPU overhead: Processing happens on the GPU after rendering, with no effect on TPS.
  
• Compatibility: Compatible with graphics and texture mods. The UI is unaffected and stays crisp.

FXAA, SMAA and CAS are post-process passes:
Game renders scene → source RT → OnRenderImage → AA blit(s) → destination RT → Present

Each method costs:

- FXAA: 1 blit
- SMAA: 3 blits (edge detection → blending weights → neighborhood blend)
- CAS (RGB/Luma): 1 blit (added after AA if enabled)

SSAA is different: it renders the world at a higher resolution and downsamples back to your screen, so its cost scales with the pixel count - 2x renders 4x the pixels, 4x renders 16x. It is fill-rate bound rather than a fixed number of blits, and is the most demanding option.

The post-process methods are cheap for sprite-based 2D rendering like RimWorld, and modern GPUs handle full-screen blits efficiently. As with anything graphics related the cost is not free - any extra pass reduces FPS. SSAA especially can be heavy at 4x. Please test and report your findings if you have substantial (or noticeable) performance loss.

• Harmony

All

1.4, 1.5, 1.6

Mods by Remi Workshop Collection


FXAA works by detecting edges based on luminance (brightness) contrast, then blurring along those edges.


Technical Details:
• Samples a 5x5 neighborhood to compute local contrast
• Determines edge orientation (horizontal vs vertical)
• Walks along the edge up to 6 pixels to find endpoints
• Blends pixels perpendicular to the edge direction
• Single pass, extremely GPU-friendly

Best for: Lower-end hardware, maximum performance

SMAA recognizes patterns. It detects the morphological shape of each aliased edge and reconstructs the smooth line it was meant to represent, using precomputed lookup tables for accurate, sharp results with minimal blur.

Technical Details:
• Pass 1: color-based edge detection
• Pass 2: blending-weight calculation using precomputed AreaTex / SearchTex lookup tables
• Pass 3: neighborhood blending
• A faithful 1:1 port of the reference shader (matches Unity's Post-Processing v2), High preset by default
• Low / Medium / High quality controls search steps and diagonal/corner detection
• Edge threshold is adjustable under Advanced Settings

Best for: Sharp, clean edges with minimal blur. Recommended for most users.

SSAA is brute force, and the highest quality. It renders the world at a higher resolution and shrinks it back down, averaging multiple samples into every final pixel. Because it has more real samples to work with, it is the only method that smooths the inside of textures, not just detected edges.

Technical Details:
• Renders the world camera into a 1.5x / 2x / 4x render target
• Downsamples back to native resolution with an iterative box filter
• Antialiases texture interiors, thin features, and in-world text - not just edges
• The UI is rendered separately and stays at native resolution (crisp)
• Mathematically exact; cost scales with the square of the scale factor

Best for: Maximum quality on capable GPUs.

CAS restores detail that anti-aliasing may soften. Unlike basic sharpening, it adapts to local contrast to avoid amplifying noise or creating halos. Apply it after AA. With SSAA it is fused into the downsample for free.

Two Modes:
CAS (RGB) - Sharpens all color channels independently
• Maximum detail enhancement
• Best for most content

CAS (Luma) - Sharpens brightness only, preserves colors
• Prevents color fringing on high-contrast edges
• Better for pixel art or stylized graphics


FXAA - Timothy Lottes, "FXAA" (NVIDIA, 2009)

SMAA - Jimenez, Echevarria, Sousa, Gutierrez, "SMAA: Enhanced Subpixel Morphological Antialiasing" (Computer Graphics Forum, 2012)

SSAA - Ordered-grid supersampling. Franklin Crow, "The Aliasing Problem in Computer-Generated Shaded Images" (CACM 20(11), 1977)

CAS - AMD FidelityFX Contrast Adaptive Sharpening (Timothy Lottes, AMD)