Godot Asset Generator

Generate game assets using AI image generation APIs and prepare them for use in Godot 4.x. This skill covers the complete art pipeline from concept to Godot-ready sprites.

When to Use This Skill

Use this skill when:

• Generating game sprites, characters, or objects using AI
• Creating tilesets for platformers or top-down games
• Generating UI elements, icons, or menu assets
• Batch-generating animation frames
• Preparing AI-generated assets for Godot import
• Creating consistent asset sets with style guides

Do NOT use this skill when:

• Creating 3D models or textures (2D assets only)
• Manual pixel art or illustration (use art software)
• Complex frame-by-frame animation (use animation tools)
• Working with existing assets (use Godot directly)

Prerequisites

Required:

• Deno runtime installed
• At least one API key:
  • OPENAI_API_KEY for DALL-E 3
  • REPLICATE_API_TOKEN for Replicate (SDXL, Flux)
  • FAL_KEY for fal.ai

Optional:

• ImageMagick for advanced image processing
• Godot 4.x project for import file generation

Quick Start

Generate a Single Image

deno run --allow-env --allow-net --allow-write scripts/generate-image.ts \
  --provider dalle \
  --prompt "pixel art knight character, front view, 16-bit style, transparent background" \
  --output ./assets/knight.png

Batch Generate Animation Frames

deno run --allow-env --allow-net --allow-read --allow-write scripts/batch-generate.ts \
  --spec ./batch-spec.json \
  --output ./generated/

Create Sprite Sheet

deno run --allow-read --allow-write scripts/pack-spritesheet.ts \
  --input ./generated/*.png \
  --output ./sprites/player-sheet.png \
  --columns 4

Core Workflow

Phase 1: Style Definition

Define your art style before generating assets:

1. Choose Art Style: Pixel art, hand-drawn, painterly, or vector
2. Create Style Guide: Document colors, modifiers, and constraints
3. Test Prompts: Generate samples to validate style consistency

{
  "style": "pixel-art",
  "resolution": 64,
  "palette": "limited-16-colors",
  "modifiers": "16-bit, no anti-aliasing, clean pixels"
}

Phase 2: Asset Generation

Generate assets using the appropriate provider:

1. Single Assets: Use generate-image.ts for individual images
2. Batch Assets: Use batch-generate.ts for multiple related assets
3. Iterate: Refine prompts based on results

Phase 3: Post-Processing

Prepare raw AI output for game use:

1. Background Removal: Extract sprites from backgrounds
2. Color Correction: Normalize palette if needed
3. Resize: Scale to exact game resolution
4. Trim/Pad: Remove whitespace, add sprite padding

deno run --allow-read --allow-write scripts/process-sprite.ts \
  --input ./raw/knight.png \
  --output ./processed/knight.png \
  --remove-bg \
  --resize 64x64 \
  --filter nearest

Phase 4: Godot Integration

Prepare assets for Godot import:

1. Pack Sprite Sheets: Combine frames into optimized sheets
2. Generate Import Files: Create .import with optimal settings
3. Configure Animations: Set up SpriteFrames resources

API Provider Selection

DALL-E 3 (OpenAI)

Best for high-quality, consistent results. Excellent prompt following.

--provider dalle --model dall-e-3

• Sizes: 1024×1024, 1792×1024, 1024×1792
• Quality: standard, hd
• Style: vivid, natural

Replicate (SDXL/Flux)

Best for style control and cheaper batch generation.

--provider replicate --model stability-ai/sdxl

• More model options (SDXL, Flux, specialized)
• Negative prompts supported
• ControlNet and img2img available

fal.ai

Best for rapid iteration and testing prompts.

--provider fal --model fal-ai/flux/schnell

• Fastest inference
• Good for prototyping
• Lower cost per image

Prompting by Art Style

Pixel Art

"pixel art [subject], 16-bit style, clean pixels, no anti-aliasing,
limited color palette, retro game sprite, transparent background"

Key modifiers: 16-bit, 8-bit, pixel art, retro, clean pixels, no anti-aliasing

Avoid: realistic, detailed, smooth, gradient

Hand-Drawn / Illustrated

"hand-drawn illustration of [subject], ink lines, watercolor texture,
sketch style, game art, white background"

Key modifiers: hand-drawn, illustration, ink lines, sketch, watercolor

Painterly / Concept Art

"digital painting of [subject], concept art style, painterly brush strokes,
dramatic lighting, game asset"

Key modifiers: digital painting, concept art, painterly, brush strokes

Vector / Flat Design

"flat design [subject], vector art style, clean edges, solid colors,
minimal shading, game icon, transparent background"

Key modifiers: flat design, vector, clean edges, solid colors, minimal

Script Reference

generate-image.ts

Generate a single image from any supported provider.

deno run --allow-env --allow-net --allow-write scripts/generate-image.ts [options]

Options:
  --provider <name>   Provider: dalle, replicate, fal (required)
  --prompt <text>     Generation prompt (required)
  --output <path>     Output file path (required)
  --model <name>      Specific model (optional, provider-dependent)
  --size <WxH>        Image size, e.g., 1024x1024 (default: 1024x1024)
  --style <name>      Style preset: pixel-art, hand-drawn, painterly, vector
  --negative <text>   Negative prompt (Replicate/fal only)
  --quality <level>   Quality: standard, hd (DALL-E only)
  --json              Output metadata as JSON
  -h, --help          Show help

batch-generate.ts

Generate multiple images from a specification file.

deno run --allow-env --allow-net --allow-read --allow-write scripts/batch-generate.ts [options]

Options:
  --spec <path>       Path to batch specification JSON (required)
  --output <dir>      Output directory (required)
  --concurrency <n>   Parallel requests (default: 2)
  --delay <ms>        Delay between requests (default: 1000)
  --resume            Resume from last successful
  --json              Output results as JSON
  -h, --help          Show help

Batch Spec Format:

{
  "provider": "replicate",
  "model": "stability-ai/sdxl",
  "style": "pixel-art",
  "basePrompt": "16-bit pixel art, game sprite, transparent background",
  "assets": [
    { "name": "player-idle", "prompt": "knight standing idle, front view" },
    { "name": "player-walk-1", "prompt": "knight walking, frame 1 of 4" },
    { "name": "player-walk-2", "prompt": "knight walking, frame 2 of 4" }
  ]
}

process-sprite.ts

Post-process generated images for game use.

deno run --allow-read --allow-write scripts/process-sprite.ts [options]

Options:
  --input <path>      Input image path (required)
  --output <path>     Output image path (required)
  --remove-bg         Remove background (make transparent)
  --resize <WxH>      Resize to dimensions
  --filter <type>     Resize filter: nearest, linear (default: nearest)
  --trim              Trim transparent whitespace
  --padding <n>       Add padding pixels
  --color-key <hex>   Color to make transparent (e.g., ff00ff)
  -h, --help          Show help

pack-spritesheet.ts

Pack multiple sprites into a sprite sheet.

deno run --allow-read --allow-write scripts/pack-spritesheet.ts [options]

Options:
  --input <pattern>   Input files (glob pattern, required)
  --output <path>     Output sprite sheet path (required)
  --columns <n>       Number of columns (default: auto)
  --padding <n>       Padding between sprites (default: 0)
  --power-of-two      Force power-of-two dimensions
  --metadata <path>   Output JSON metadata path
  -h, --help          Show help

Output Metadata:

{
  "image": "player-sheet.png",
  "size": { "width": 256, "height": 128 },
  "frames": [
    { "name": "idle", "x": 0, "y": 0, "width": 64, "height": 64 },
    { "name": "walk-1", "x": 64, "y": 0, "width": 64, "height": 64 }
  ]
}

generate-import-files.ts

Generate Godot .import files with optimal settings.

deno run --allow-read --allow-write scripts/generate-import-files.ts [options]

Options:
  --input <path>      Input image or directory (required)
  --preset <name>     Preset: pixel-art, hd-sprite, ui (default: pixel-art)
  --frames <n>        Animation frame count (for sprite sheets)
  --columns <n>       Sprite sheet columns
  --fps <n>           Animation FPS (default: 12)
  -h, --help          Show help

Godot Import Settings

Pixel Art Sprites

Filter Mode: Nearest
Compression: Lossless
Mipmaps: Off
Fix Alpha Border: On

HD Sprites

Filter Mode: Linear
Compression: VRAM Compressed
Mipmaps: On

UI Elements

Filter Mode: Linear (or Nearest for pixel UI)
Compression: Lossless
Mipmaps: Off

Examples

Example 1: Pixel Art Character with Walk Animation

# 1. Create batch spec
cat > character-batch.json << 'EOF'
{
  "provider": "replicate",
  "style": "pixel-art",
  "basePrompt": "16-bit pixel art knight, game sprite, transparent background",
  "assets": [
    { "name": "knight-idle", "prompt": "standing idle, front view" },
    { "name": "knight-walk-1", "prompt": "walking, left foot forward" },
    { "name": "knight-walk-2", "prompt": "walking, standing straight" },
    { "name": "knight-walk-3", "prompt": "walking, right foot forward" },
    { "name": "knight-walk-4", "prompt": "walking, standing straight" }
  ]
}
EOF

# 2. Generate images
deno run --allow-env --allow-net --allow-read --allow-write \
  scripts/batch-generate.ts --spec character-batch.json --output ./raw/

# 3. Process sprites
for f in ./raw/knight-*.png; do
  deno run --allow-read --allow-write scripts/process-sprite.ts \
    --input "$f" --output "./processed/$(basename $f)" \
    --remove-bg --resize 64x64 --filter nearest
done

# 4. Pack sprite sheet
deno run --allow-read --allow-write scripts/pack-spritesheet.ts \
  --input "./processed/knight-*.png" \
  --output ./sprites/knight-sheet.png \
  --columns 5 --metadata ./sprites/knight-sheet.json

# 5. Generate Godot import
deno run --allow-read --allow-write scripts/generate-import-files.ts \
  --input ./sprites/knight-sheet.png --preset pixel-art \
  --frames 5 --columns 5 --fps 8

Example 2: Tileset Generation

# Generate individual tiles
deno run --allow-env --allow-net --allow-write scripts/generate-image.ts \
  --provider dalle \
  --prompt "seamless pixel art grass tile, top-down view, 32x32, game tileset" \
  --output ./tiles/grass.png \
  --style pixel-art

# Process and resize
deno run --allow-read --allow-write scripts/process-sprite.ts \
  --input ./tiles/grass.png --output ./tiles/grass-processed.png \
  --resize 32x32 --filter nearest

Example 3: UI Icons

# Batch generate UI icons
cat > ui-batch.json << 'EOF'
{
  "provider": "fal",
  "style": "vector",
  "basePrompt": "flat design game icon, clean edges, solid colors, transparent background",
  "assets": [
    { "name": "icon-sword", "prompt": "sword weapon icon" },
    { "name": "icon-shield", "prompt": "shield defense icon" },
    { "name": "icon-potion", "prompt": "health potion bottle icon" },
    { "name": "icon-coin", "prompt": "gold coin currency icon" }
  ]
}
EOF

deno run --allow-env --allow-net --allow-read --allow-write \
  scripts/batch-generate.ts --spec ui-batch.json --output ./icons/

Common Issues

API Key Not Found

Error: OPENAI_API_KEY environment variable is not set

Solution: Export the API key before running:

export OPENAI_API_KEY="sk-..."

Inconsistent Style Across Batch

Problem: Generated images have different styles despite same prompt.

Solutions:

• Use more specific style modifiers
• Use Replicate with seed parameter for reproducibility
• Generate more images and select best matches
• Use img2img with reference image (Replicate)

Background Removal Fails

Problem: --remove-bg doesn’t cleanly separate sprite.

Solutions:

• Add “transparent background” or “white background” to prompt
• Use --color-key with a specific background color
• Use more explicit prompts: “isolated on transparent background”
• Manual cleanup may be needed for complex images

Pixel Art Has Anti-Aliasing

Problem: Generated pixel art has smoothed edges.

Solutions:

• Add “no anti-aliasing”, “clean pixels” to prompt
• Generate at larger size, then downscale with nearest neighbor
• Use --filter nearest in process-sprite.ts
• Post-process with palette reduction

Rate Limiting

Problem: API returns 429 rate limit errors.

Solutions:

• Increase --delay in batch-generate.ts
• Reduce --concurrency
• Wait and retry
• Use different provider for large batches

Additional Resources

Prompting Guides

• references/prompting/pixel-art.md – Detailed pixel art techniques
• references/prompting/hand-drawn.md – Illustrated style guide
• references/prompting/consistent-characters.md – Character consistency

API Guides

• references/api-guides/openai-dalle.md – DALL-E 3 API reference
• references/api-guides/replicate-sdxl.md – Replicate integration
• references/api-guides/fal-ai.md – fal.ai guide

Godot Integration

• references/godot-integration/import-settings.md – Import configuration
• references/godot-integration/animation-setup.md – AnimatedSprite2D setup

Templates

• assets/prompts/pixel-art-templates.json – Pixel art prompt templates
• assets/prompts/character-templates.json – Character prompts
• assets/style-guides/style-guide-template.json – Style guide schema

Limitations

• API-based only: Requires internet and API keys (no local models)
• Style consistency: AI may produce variations despite same prompt
• Resolution constraints: Each provider has size limits
• 2D assets only: Not for 3D models, textures, or complex animations
• Background removal: May require manual cleanup for complex images
• Cost: API calls incur charges, especially for large batches