AI로 게임 스프라이트 시트 만들기

{
  "styleGuide": {
    "artStyle": "2D vector cartoon, soft gradients, cel-shaded highlights",
    "perspective": "side view, slight 3/4 angle facing right",
    "lighting": "soft top-left lighting, subtle rim light on edges",
    "outline": "clean dark outline (2-3px), slightly thicker on body",
    "mood": "friendly and appealing for casual mobile game",
    "references": "Insaniquarium, Fishdom, mobile idle games"
  },
  "species": {
    "guppy": {
      "name": "Guppy",
      "description": "Small colorful freshwater fish",
      "physicalTraits": {
        "bodyShape": "small oval body, slightly chubby belly",
        "distinguishingFeatures": "large flowing tail, big cute eyes"
      },
      "layers": [
        {
          "name": "body",
          "variants": ["round", "slim", "chubby"],
          "promptDetails": {
            "round": "perfectly round plump body, balloon-like cute shape",
            "slim": "elongated streamlined body, elegant swimmer shape",
            "chubby": "extra pudgy body, adorable fat cheeks"
          }
        },
        {
          "name": "tail",
          "variants": ["delta", "veil", "lyretail", "round"],
          "promptDetails": {
            "delta": "triangular delta tail, classic guppy shape",
            "veil": "long flowing veil tail, elegant draping fabric-like"
          }
        }
      ],
      "colors": [
        { "name": "sunset_orange", "hex": "#FF6B35", "description": "warm sunset orange with yellow highlights" },
        { "name": "ocean_blue", "hex": "#2E86AB", "description": "deep ocean blue with teal undertones" }
      ]
    }
  }
}

function buildFullFishPrompt(speciesKey, species, bodyVariant, color, pattern) {
  const { styleGuide } = config;

  return `
Create a single ${species.name} fish character for a mobile game.

CHARACTER SPECS:
- Species: ${species.name}
- Body Type: ${bodyVariant} - ${species.layers.find(l => l.name === 'body').promptDetails[bodyVariant]}
- Color: ${color.name} (${color.hex}) - ${color.description}
- Pattern: ${pattern}

ART STYLE (MUST FOLLOW):
- ${styleGuide.artStyle}
- ${styleGuide.perspective}
- ${styleGuide.lighting}
- ${styleGuide.outline}

TECHNICAL REQUIREMENTS:
- 512x512px, transparent PNG, centered composition
- Single character, no duplicates
- BACKGROUND: Plain solid white background.
  `.trim();
}

function buildPrompt(fish) {
  return `IMAGE 1: Layout template (empty grid)
IMAGE 2: "${fish.name}" character idle sprite (reference)

TASK: Fill the template grid with the "${fish.name}" character.
Draw the character ONCE in each cell matching the state.

CELLS:
Top row:  IDLE | DEAD (belly-up, X eyes, gray) | HUNGRY (thin, sad) | HAPPY (smile, sparkles)
Bottom row:  SICK (green tint, spiral) | EATING (mouth open, food crumbs) | ATTACKING (lunging, fierce)

STRICT RULES:
- Same character in ALL 7 cells — same body shape, same species
- Each state must be CLEARLY DIFFERENT
- 2D vector cartoon style matching the reference`;
}

async function removeBackgroundAI(imageBuffer) {
  writeFileSync(inputPath, imageBuffer);
  execSync(`python3 rembg_worker.py "${inputPath}" "${outputPath}"`);
  return readFileSync(outputPath);
}

BACKGROUND: Solid pure green (#00FF00) background ONLY - classic green screen