Animated sprite generation
Skill 0xheycat/isometric-game-skills/skills/animated-sprite-generation
Agent-ready toolkit for isometric games: ComfyUI art pipelines, seamless terrain, sprites, grid math, Canvas2D rendering, pathfinding, and asset automation.
npx -y skills add 0xheycat/isometric-game-skills --skill animated-sprite-generationAssembled from the repository path, not quoted from the project. Check it against their README if it does not work.
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Use when creating looping animated isometric sprites (water, fire, windmills, flags) as frame strips that play back smoothly in-engine.
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SKILL.md
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Animated Sprite Generation
Overview
Animation in 2D isometric games is frame-based, not skeletal. This skill produces short, seamless LOOPS as frame strips. Do NOT animate ground tiles - animate objects on top of them, or performance and visual noise explode.
When to Use
- You need animated water, fire, smoke, windmills, or flags.
- You want idle/ambient motion without a 3D engine.
- A sprite must loop seamlessly without a visible jump.
Process
- Decide frame count for a clean loop (4-8 frames is plenty for ambient motion).
- Generate frames with a FIXED seed, varying only the motion phrase per frame (e.g. wave phase, blade angle).
- Keep the silhouette and lighting identical - only the moving part changes.
- Assemble frames into a horizontal strip / sprite sheet.
- Confirm frame 1 and frame N loop seamlessly (last frame flows into first).
- Play back in-engine at a low FPS (6-12) for ambient motion.
- NEVER animate full ground tiles - animate overlay objects only.
# assemble frames into a horizontal strip
convert frame_*.png +append spritesheet.png
Rationalizations (Stop Lying to Yourself)
| Excuse | Reality |
|---|---|
| "More frames = smoother = better" | More frames = more VRAM and bigger atlas for zero visible gain on ambient loops. |
| "I will animate the water tiles directly" | Animating every ground tile tanks performance. Use an overlay object. |
Red Flags - STOP if you catch yourself:
- Animating ground tiles instead of overlay objects.
- Loop visibly jumps between last and first frame.
- Silhouette or light changes between frames.
Verification
You are NOT done until every box is checked:
- The loop is seamless (last frame flows into first).
- Only the intended part moves; silhouette/light stay fixed.
- Ground tiles are NOT animated; only overlay objects are.