Seamless Isometric Terrain

Seamless Isometric Terrain (Hay Day-style) — Skill

What this skill does

This skill produces isometric ground tiles that snap together into a clean map with no seams, no gaps, and no color chaos — the look of mobile farm games like Hay Day. It targets ComfyUI on an RTX 3060 12GB / 32GB RAM but the recipe works on any SDXL-capable GPU.

The single most important idea: a map looks seamless when every tile shares the exact same diamond shape and thickness. Get the shape consistent first (fixed seed), then vary only the surface texture. Everything in this skill enforces that rule.

Goal: tiles that connect into a continuous map. This is a reference render — production tiles are generated one-by-one in ComfyUI and assembled by the game engine.

When to use this skill

• The user wants to make terrain / ground tiles for an isometric game or map.
• Tiles don't line up: visible edges, seams, gaps, or mismatched sizes/angles.
• Tiles have mixed/irregular colors, stray grass rims, or random props.
• The user needs the ComfyUI workflow, prompts, settings, or transparent-PNG export for tiles.
• The user asks to extend a tile set (seasons, new materials like sand/stone/snow).

How to use this skill (workflow at a glance)

1. Read the overview → references/01-overview.md (concepts + the golden rule).
2. Set up ComfyUI with the proven recipe → references/02-production-guide.md.
3. Copy the prompts (positive/negative + per-tile table) → references/03-prompts.md.
4. Follow the rules + the avoid-list → references/04-rules.md.
5. If a tile is wrong, diagnose it → references/05-troubleshooting.md.
6. Build the full set / extend it → references/06-tileset-spec.md.

When running the workflow programmatically, see scripts/ for the ComfyUI graph builder and the rembg (transparent background) node plan.

The golden rule (never break this)

> Fix the seed. Keep the prompt short. Same shape for every tile. > > Seam problems are almost never a texture problem — they are a shape consistency > problem. Use one FIXED seed for the whole set so every tile is the same diamond, > then only swap the short surface phrase per material.

One tile, done right: 2:1 diamond, full surface, thick solid soil base, clean background.

Quick reference card

| Setting | Value | |---|---| | Checkpoint | juggernautXL_ragnarokBy | | LoRA 1 | isometric_tilemap_xl @ 0.75 | | LoRA 2 | white_background_sdxl @ 0.7 | | Sampler / Scheduler | DPM++ 2M / Karras | | Steps / CFG | 30 / 6.5 | | Seed | FIXED (identical for every tile in the set) | | Resolution | 1024 × 1024, batch 1 | | VAE | sdxl_vae | | Export | rembg / SAM → transparent PNG |

Positive template:

single isometric full [SURFACE] block tile, 2:1 isometric view,
thick solid [COLOR] soil base underneath, soft painterly shading,
simple clean composition, isolated on plain flat background,
game asset, high quality

Never put these in the prompt (top 3 causes of failure):

1. thin grassy rim / green grass along the edges
2. Hay Day mobile farm game art style, cute hand-painted cartoon
3. Long, wordy surface descriptions

See references/04-rules.md for the full avoid-list and references/05-troubleshooting.md for fixes.

Verification

The tile set is done only when every box is checked:

• [ ] Each tile fills its full 2:1 isometric footprint — no thin grassy rim or stray edge.
• [ ] Placed in a grid, tiles connect with no visible seam, gap, or color mismatch.
• [ ] The seed was fixed across the whole set, so colors/lighting match.
• [ ] No stray props, buildings, or extra objects baked into a ground tile.
• [ ] Background removed to clean transparent alpha (no halo/fringe).
• [ ] The prompt did not contain any of the 3 banned phrases above.
• [ ] 3+ terrain types generated and verified together in one test map.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: 0xheycat
• Source: 0xheycat/isometric-game-skills
• License: MIT
• Homepage: https://0xheycat.github.io/isometric-game-skills/demo/

Install and usage instructions live in the source repository linked above.