Generate AI-powered item images for Mystica game using Gemini with R2-hosted reference images. Use when creating item assets, generating game art, or when user mentions "item image", "generate image", "Mystica items", or "game assets".
Generate consistent AI-powered item images for Mystica using Gemini with style reference images.
npx tsx scripts/generate-image.ts \
--type "ITEM_TYPE" \
--materials "material1,material2" \
--provider gemini \
-r "https://pub-1f07f440a8204e199f8ad01009c67cf5.r2.dev/image-refs/IMG_0821.png,https://pub-1f07f440a8204e199f8ad01009c67cf5.r2.dev/image-refs/IMG_2791.png,https://pub-1f07f440a8204e199f8ad01009c67cf5.r2.dev/image-refs/IMG_4317.png,https://pub-1f07f440a8204e199f8ad01009c67cf5.r2.dev/image-refs/IMG_5508.png,https://pub-1f07f440a8204e199f8ad01009c67cf5.r2.dev/image-refs/IMG_9455.png"
| Parameter | Source | Example |
|---|---|---|
--type | docs/seed-data-items.json | "Gatling Gun", "Umbrella" |
--materialsdocs/seed-data-materials.json |
"cocaine,lava,plasma" (1-3 materials) |
--provider | Always gemini | gemini |
-r | Always all 5 URLs below | See Quick Start |
| Parameter | Default | Purpose |
|---|---|---|
--aspect-ratio | Auto | "2:3" for portrait items |
--format | png | jpg for smaller files |
-o | scripts/output/gemini-{timestamp}.png | Custom output path |
Epic-tier weapon:
npx tsx scripts/generate-image.ts \
--type "Gatling Gun" \
--materials "cocaine,lava,plasma" \
--provider gemini \
-r "https://pub-1f07f440a8204e199f8ad01009c67cf5.r2.dev/image-refs/IMG_0821.png,https://pub-1f07f440a8204e199f8ad01009c67cf5.r2.dev/image-refs/IMG_2791.png,https://pub-1f07f440a8204e199f8ad01009c67cf5.r2.dev/image-refs/IMG_4317.png,https://pub-1f07f440a8204e199f8ad01009c67cf5.r2.dev/image-refs/IMG_5508.png,https://pub-1f07f440a8204e199f8ad01009c67cf5.r2.dev/image-refs/IMG_9455.png"
Output: scripts/output/gemini-{timestamp}.png → "Molten Vaporizer"
Uncommon utility item:
npx tsx scripts/generate-image.ts \
--type "Umbrella" \
--materials "bubble,slime" \
--provider gemini \
-r "https://pub-1f07f440a8204e199f8ad01009c67cf5.r2.dev/image-refs/IMG_0821.png,https://pub-1f07f440a8204e199f8ad01009c67cf5.r2.dev/image-refs/IMG_2791.png,https://pub-1f07f440a8204e199f8ad01009c67cf5.r2.dev/image-refs/IMG_4317.png,https://pub-1f07f440a8204e199f8ad01009c67cf5.r2.dev/image-refs/IMG_5508.png,https://pub-1f07f440a8204e199f8ad01009c67cf5.r2.dev/image-refs/IMG_9455.png"
Output: scripts/output/gemini-{timestamp}.png → "Slimebub Umbrella"
Common: coffee, gum, feather, button, candle, pizza Uncommon: matcha_powder, bubble, slime, propeller, magnet Rare: rainbow, lava, ghost, shadow, goo, cocaine, lube, void Epic: diamond, lightning, laser_beam, stardust, plasma
Complete list with stat modifiers: docs/seed-data-materials.json
# Required in .env
REPLICATE_API_TOKEN=your_token
OPENAI_API_KEY=your_key
R2 bucket mystica-assets already configured at https://pub-1f07f440a8204e199f8ad01009c67cf5.r2.dev/
Quick Upload:
cd docs/image-refs
# Upload all images to R2 (remote)
for file in IMG_*.png; do
wrangler r2 object put "mystica-assets/image-refs/$file" --file="$file" --remote
done
# Verify uploads
curl -I "https://pub-1f07f440a8204e199f8ad01009c67cf5.r2.dev/image-refs/IMG_0821.png"
Complete R2 Guide: See the Wrangler R2 Guide skill - Comprehensive Wrangler CLI reference with all bucket operations, CORS config, troubleshooting, and cost info.
docs/external/r2-image-hosting.md (integration guide)docs/ai-image-generation-workflow.mdscripts/generate-image.tsscripts/generate-item-description.ts