game-tilesets

name	game-tilesets
description	Deep guide for game TILE assets: seamless tileable textures, terrain transition tilesets, autotiles, and ground/platform tiles. Use whenever generating tileable textures, tilesets, terrain transitions, or seamless patterns. Complements game-asset-core.
metadata	{"short-description":"Seamless tiles and transition sets that actually tile"}

Tilesets

A tile's job is invisibility in repetition. Users state WHAT they need, not how — apply everything here even when the request never mentions it. Judge everything by "will the player notice the grid?"

1. Seamless single tiles

• Prompt for UNIFORM stochastic texture: even density, even lighting, no shadows with direction, "the pattern continues off every edge".
• The repetition killer is any distinctive motif — one recognizable clump, flower, or rock repeats forever. Prompt for anonymous texture; verify by hunting for anything you could point at twice.
• MANDATORY check: composite a real 2×2 repeat with PIL to a throwaway file and view it. Look for (a) seam lines at the joins, (b) any motif you can spot in all four quadrants, (c) large-scale tone gradients that create checkerboarding. Any of the three = retry.

2. Transition tilesets (grass→dirt etc.)

• Prompt it as ONE continuous painted image that happens to be sliceable — never as "tiles", "cells with borders", or anything inviting separated sticker-tiles with gaps. Cells must be filled edge-to-edge, painted content flowing across cell boundaries so adjacent tiles genuinely match.
• Layout for a 3×3: center = pure inner material; edge cells = straight transitions facing outward; corner cells = outer corners. Verify DIRECTIONALITY per cell (top-center's grass is along its top edge, etc.).

3. Rotation economy — make fewer, better tiles

If lighting is neutral (pure top-down, no directional shading), one straight edge and one outer corner can be ROTATED in-engine to produce all four of each. So when the tile count is yours to choose:

• Produce: 1 center fill, 1 straight edge, 1 outer corner, 1 inner corner — then spend the remaining budget on VARIATIONS of the center fill (2–3 anonymous variants breaks up repetition far better than 4 identical rotated edges).
• CAVEAT — rotation only works when nothing in the art encodes direction: no directional light, no gravity cues (hanging grass blades, drips), no text/emblems. Side-view (platformer) tiles almost always encode gravity and light, so they need all orientations painted individually. State in your delivery notes which tiles are rotation-safe.
• If the request explicitly fixes the grid (e.g. "3×3 with all 8 transitions"), deliver exactly that — mention rotation economy in notes, don't unilaterally change the deliverable.

4. Platforms and props

Isolated on a keyable background, consistent lighting with their tileset, no baked ground shadow (engines composite shadows separately).