Asset Generation

Asset Generation Pipeline

Generate → Validate → Convert → Import → Validate Again → Integrate

Every step must pass before proceeding to the next. No manual intervention.

3D Models

Meshy AI (Primary)

• REST API, outputs FBX/GLB/OBJ
• PBR textures included
• Adjustable polygon count: 1K–300K faces
• Native UE plugin available
• Best for: characters, vehicles, props

# Example API call (requires MESHY_API_KEY)
curl -X POST https://api.meshy.ai/v2/text-to-3d \
  -H "Authorization: Bearer $MESHY_API_KEY" \
  -d '{"prompt": "low poly cartoon frog character", "topology": "quad", "target_polycount": 1500}'

Blender Headless (Procedural Geometry)

• Full programmatic control via Python scripts
• Best for: lane markers, platforms, simple obstacles, tiling geometry

blender -b -P scripts/generate_road_tile.py -- --width 200 --length 100 --output road_tile.fbx

Validation

• trimesh: Verify mesh integrity (watertight, no degenerate faces, correct normals)
• Polycount check: Must be within budget (see Art Director specifications)
• Scale check: Must match UE unit scale (1 unit = 1 cm)

Textures

Scenario API (Primary)

• Purpose-built for game development
• Generates complete PBR map sets: albedo, normal, roughness, metallic, height, AO
• REST API with style consistency features

Poly Haven (CC0 Library)

• 100+ photoscanned PBR texture sets
• Public API, 8K+ resolution
• Best for: environmental surfaces, road, water, grass

Procedural (Python)

• Pillow/NumPy for simple patterns
• Best for: noise textures, gradients, color fills for blockmesh

Texture Standards

• Power-of-2 dimensions (256, 512, 1024, 2048)
• Albedo: RGB, no alpha unless transparency needed
• Normal: RGB, OpenGL format (convert from DirectX if needed)
• Roughness/Metallic: Grayscale
• Max resolution: 2048x2048 for props, 1024x1024 for tiling

Audio

ElevenLabs SFX V2

• Text-to-SFX generation
• 48kHz professional quality
• Supports looping and duration control (up to 30 seconds)
• Best for: realistic effects, ambient sounds

rFXGen (Retro/Arcade)

• Single CLI executable (~1.5MB)
• Presets: coin, explosion, powerup, hit, jump
• WAV output
• Best for: retro arcade sound effects

# Generate a jump sound
rfxgen -t jump -o hop_sound.wav

Audio Standards

• Source format: WAV 48kHz 16-bit
• Shipping format: OGG (compressed by UE on import)
• Naming: SW_ prefix for Sound Waves, SC_ for Sound Cues
• Import path: /Content/Audio/{Category}/

UE Import Automation

import unreal

def import_asset(filepath, destination, asset_type="mesh"):
    task = unreal.AssetImportTask()
    task.filename = filepath
    task.destination_path = destination
    task.automated = True
    task.replace_existing = True

    if asset_type == "mesh":
        task.options = unreal.FbxImportUI()
        task.options.import_materials = True
        task.options.import_textures = True

    unreal.AssetToolsHelpers.get_asset_tools().import_asset_tasks([task])
    return task.imported_object_paths

Asset Budget (UnrealFrog)