Edge Fusion HDRP: Smooth Surface Contacts

Edge Fusion HDRP is a post-processing effect for the High-Definition Rendering Pipeline that blends edges between objects to eliminate hard seams and produce cohesive, natural-looking scenes. Add it as a Render Feature and control it through a Volume, with both global and per-object settings to target exactly where blending should occur.

🌟 Key features:

- Edge blending: smooths transitions between meshes, terrain, and props without changing materials or geometry.

- Global control via Volume: intensity, world‑space radius, max blend distance, and max screen radius.

- Intra-object fusion (optional): blends within the same mesh based on normal/depth discontinuities.

- Per-object overrides with Edge Fusion Object: custom radius (0 disables), include children with layer mask.

- Performance tuning: sample count, binary search steps, jitter (TAA-friendly), 3D noise (intensity/scale), shadow protection.

- Blend layers: choose precisely which objects participate in blending, including exclusion rules.

- Debug views: object IDs, Edges, Blending, Normals, and Depth.

- Compare mode: realtime side-by-side view to compare the original with the applied effect.

- Editor friendly: optional Scene View rendering; can run even if the camera’s post processing is off.

🎯 Ideal usecases:

• Modular environments: hide seams between tiles, walls, floors, cliffs.
• Terrain + props/materials: blend contacts for rocks, sand, snow, mud, gravel, dust, ice, ash, soil, moss, roots, asphalt/roads, ...
• Kitbashing/mixed packs: unify assets from different styles and PBR setups.
• Photogrammetry: soften scan boundaries when merging with terrain/meshes.
• Foliage/debris contacts: reduce harsh intersections for more believable placement.
• Intra‑object smoothing: reduce visible splits/normal seams on segmented meshes.
• Cinematics/marketing: fast polish without editing materials or geometry.
• Prototyping/blockouts: Instant cohesion while iterating layouts.

➡️ Getting started:

1) Add a Custom Pass Volume to your scene (GameObject -> Volume -> Custom Pass).

2) Set the Custom Pass Volume to Global and Injection Point to "After Opaque and Sky" or "Before Transparent”.

3) Add "EdgeFusionPass" to the Custom Pass Volume.

4) Set Intensity > 0 to enable the effect and customize!

Related assets:

- Edge Fusion for URP.

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