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fal-assets

Generate game assets with fal (fal.ai) through the fal MCP server, the `um fal` CLI (REST) or `fal api`. Covers sprites and icons with transparent backgrounds, consistent variants and animation frames, pixel art, seamless textures, PBR material maps, image-to-3D models, remeshing, auto-rigging, sound effects, music, voice lines, and trailer or cutscene video. Use whenever a mod needs new art, audio or 3D models, or the user mentions fal, generating sprites, textures, models, SFX or music for a game.

インストール方法を見る

含まれるファイル(1)

  • SKILL.md7.9 KB

SKILL.md(原文)

インストールする前に、エージェントに与えられる指示の中身を確認できます。

Game assets with fal

fal runs hundreds of generative models behind one API key. Use it whenever the mod needs something that doesn't exist yet: a weapon sprite, a boss, a unit rendered from 16 angles, a tileable floor, a laser sound, boss music, a voiced line.

Setup (check once per session)

  • Key. FAL_KEY must be set (create one at https://fal.ai/dashboard/keys). um fal also reads it from a .env file (FAL_KEY=...) in the working folder. Never write the key into mod files; um publish check flags leaked keys.

  • MCP. fal's hosted MCP server is https://mcp.fal.ai/mcp with header Authorization: Bearer $FAL_KEY. The repo pre-configures it for each agent:

    • Claude Code: .mcp.json
    • Codex: .codex/config.toml
    • Cursor: .cursor/mcp.json
    • VS Code/Copilot: .vscode/mcp.json
    • Gemini CLI: gemini-extension.json

    To add it by hand:

    • Claude Code: claude mcp add --transport http fal https://mcp.fal.ai/mcp --header "Authorization: Bearer $FAL_KEY"
    • Codex (~/.codex/config.toml): [mcp_servers.fal] with url = "https://mcp.fal.ai/mcp" and bearer_token_env_var = "FAL_KEY"
    • anything else: point its MCP config at the URL and header above. MCP tools: search_models, recommend_model, get_model_schema, get_pricing, run_model, submit_job/check_job/get_job_result, upload_file, search_docs.
  • No fal key? For images, um comfy uses a local ComfyUI server instead (um comfy status, then um comfy image "..." --sprite). It has no audio, 3D or video recipes.

  • CLI alternatives: pip install fal gives fal api <endpoint> key=value key:=json; the genmedia CLI (genmedia run ... --json --download) is agent-friendly too.

Which interface

  • Discovery (what's the best model for X right now, its inputs, its price): fal MCP recommend_model / search_models / get_model_schema / get_pricing, or um fal search, um fal schema <endpoint>, um fal price <endpoint>. The catalog changes weekly. The defaults below were current in September 2026; check before a big batch.
  • Anything that must land on disk (every game asset): um fal <recipe>. It uploads local inputs, queues, polls, downloads every output file, and appends the endpoint, inputs, seed and request id to <out>/fal_manifest.jsonl, so every asset can be traced and regenerated.
  • Quick look or one-off where a URL is enough: MCP run_model.

Recipes (um fal <recipe> --help for options; --model overrides the endpoint; --set k=v passes extra inputs)

AssetCommandDefault endpoint
Sprite / icon, transparent backgroundum fal sprite "<subject, view, style>" --name xopenai/gpt-image-2 (background=transparent)
Concept art, key art, backgroundsum fal image "<prompt>" --aspect 16:9fal-ai/nano-banana-2
Consistent variants, extra frames, recolors, same character new poseum fal edit "<change>" --ref base.pngfal-ai/nano-banana-2/edit
Background removalum fal rmbg in.pngfal-ai/birefnet/v2
Clean pixel art from any imageum fal pixelate in.png --colors 24fal-ai/image2pixel
Upscaleum fal upscale in.png --factor 2fal-ai/seedvr/upscale/image
Seamless tiling textureum fal texture "mossy cobblestone"fal-ai/z-image/turbo/tiling
PBR maps (basecolor, normal, roughness, metalness, height)um fal pbr "rusted sheet metal"fal-ai/patina/material
Image → textured 3D model (GLB)um fal model3d concept.png [--engine trellis2|hunyuan|tripo|meshy]fal-ai/trellis-2
Auto-rig a humanoid, optional animationsum fal rig character.glb --animatefal-ai/meshy/rigging
Sound effectum fal sfx "plasma rifle shot, punchy" --seconds 1.2fal-ai/elevenlabs/sound-effects/v2
Musicum fal music "tense boss battle, chiptune, 150 bpm" --seconds 90elevenlabs/music/v2.5
Voice lineum fal voice "You dare challenge me?" --voice-id Adamfal-ai/elevenlabs/tts/eleven-v3
Trailer / cutscene clipum fal video still.png "camera orbits the boss"bytedance/seedance-2.5/image-to-video
Anything elseum fal run <endpoint> key=value key:=json image_url=@local.pngany

Other useful endpoints:

  • 3D: tripo3d/tripo/remesh and fal-ai/meshy/v5/remesh (low-poly, game-ready), fal-ai/trellis-2/retexture.
  • Motion: fal-ai/hunyuan-motion (text → motion).
  • Icons: fal-ai/recraft/v4.1/text-to-vector (SVG icons).
  • Video cutouts: pixelcut/video-background-removal.
  • Music: google/lyria-3.5.
  • Voice: fal-ai/minimax/speech-2.8-hd.

Prompting game art that fits the game

  • Look at the game's own assets first: pixel size, outline, palette, perspective, facing, how busy they are. Put that into a reusable style suffix. For Terraria: "16-bit pixel art game sprite in the style of Terraria, crisp dark outline, limited palette, centered, plain flat white background, no shadow, no text".
  • Describe the view and orientation explicitly: "perfectly horizontal side view with the muzzle pointing right" for held weapons, "seen from the side facing left" for enemies, "pointing straight down" for a falling bomb. Engines have conventions (Terraria items point right, NPCs face left) and fixing orientation afterwards costs quality.
  • Backgrounds: transparent (gpt-image-2) or a flat colour that um sprite cutout can flood-fill. Avoid gradients, scenery and ground shadows. If a soft shadow sneaks in, use --grey / --keep-top in cutout.
  • Player / team colour: ask for "bright saturated blue accents" on the parts that should take the player's colour, then um sprite team-mask --hue blue turns them into a mask.
  • Consistency across a set: generate one hero image, then derive the rest with the edit endpoint and the hero as --ref ("same robot, now firing, muzzle flash"). Don't ask one prompt for a whole sprite sheet; grids come out uneven.
  • Many angles or frames of the same object: go 3D. Take the concept, run um fal model3d, then um render3d from the game's camera (asset-pipeline skill). That's how the AoE2 robotaxi got 16 consistent headings × 5 animations.
  • No text or logos in art unless wanted: models love to add them.

Audio for engines

  • The SFX and music endpoints return MP3. Convert to what the engine wants:
    • ffmpeg -i x.mp3 -ar 44100 x.wav (XNA/tModLoader, most engines);
    • ffmpeg -i x.mp3 -c:a libvorbis -q:a 5 x.ogg (Minecraft, Godot, Unity);
    • trim silence first: -af silenceremove=start_periods=1:start_threshold=-50dB.
  • Loops: um fal sfx ... --loop, or ask the music model for a loopable track and crossfade the ends.
  • Keep SFX short (0.2-2 s) and normalize loudness (-af loudnorm=I=-16) so they sit with the game's own sounds.

Cost and etiquette

  • Price the expensive stuff: before batching 3D, video or long music, check the price (um fal price <endpoint> / MCP get_pricing). For more than about 20 generations or anything video-sized, tell the user the rough cost first.
  • Iterate cheap: use low quality or resolution while exploring (--quality low, --res 0.5K), then re-run the winners at full quality with the same prompt (and seed where supported).
  • Reproducibility: keep fal_manifest.jsonl with the assets; it records prompts, seeds and request ids.
  • Credits: in the mod's README, credit that assets were generated with fal and name the models. Check a model's license page for commercial use.

レビュー

まだレビューはありません。使ってみた感想をお寄せください。

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