/procedural-modeling

name: procedural-modeling
description: Procedural asset creation for rocks, buildings, vegetation, roads, terrain, pipes, cables, and sci-fi panels using Geometry Nodes and modifier-based workflows in Blender via MCP.
license: MIT
metadata:
  author: https://github.com/arjun988
  version: "1.0.0"
  domain: blender
  role: specialist
  triggers: procedural modeling, procedural rock, procedural building, terrain, road, pipe, cable, sci-fi panel, parametric
  related-skills: geometry-nodes, environment-artist, blender-modeler

Procedural Modeling

Parametric assets with art-directable variation. Geometry Nodes priority. Bake for game export.

When to Use

• Rocks, cliffs, terrain features
• Modular building generation
• Road and path systems
• Pipe/cable networks
• Sci-fi panel arrays
• Vegetation placement systems

Workflow

Define Parameters → Build Procedural System → Validate Variations
    → Realize/Bake → Optimize → Export

System Categories

| System | Primary Tool | Output | |--------|--------------|--------| | Rocks | Geo Nodes + noise | Static mesh | | Buildings | Geo Nodes stack | Modular pieces | | Roads | Curve + Geo Nodes | Mesh strip | | Pipes | Curve to mesh | Network | | Vegetation | Scatter GN | Instanced/baked | | Sci-fi panels | Array + random | Trim sheet geo |

Rock Generation

Base shape (ico sphere) → Displace (multi-scale noise)
    → Decimate → Subdivide (selective) → Weighted Normal
    → Variation: seed input controls all noise

Expose: `seed`, `scale`, `roughness`, `density`

Building Generation

Footprint curve → Extrude floors → Window boolean pattern
    → Balcony probability → Roof type switch → Material ID

Output separate meshes per floor module for game kits.

Road Systems

Centerline curve → Resample → Cross-section profile
    → Bridge blend at intersections → UV follow curve

Pipe/Cable Networks

Node graph points → Connect minimum spanning → Curve segments
    → Profile sweep → Collision offset → Clamp size range

Sci-Fi Panels

Grid subdivide → Random inset/extrude → Bevel
    → Panel index → Material variation
    → Bake to trim sheet layout

Variation Testing

Test at parameter extremes:

• Minimum scale/density
• Maximum scale/density
• Seed 0, 42, 9999 (reproducibility check)

Game Export Decision

| Approach | When | |----------|------| | Keep procedural in Blender only | Iteration phase | | Realize single variant | Standard game prop | | Bake multiple seeds as LOD variants | Background variety | | Export node group to engine | Only if engine supports |

MCP Integration

1. Build procedural systems via MCP 2. Set seed/density parameters via MCP 3. Realize geometry via MCP 4. Query output polycount per variation 5. Export realized meshes

Constraints

MUST DO

• Expose seed for reproducibility
• Test min/max parameter bounds
• Realize before game engine export
• Optimize after realize (asset-optimization)
• Document parameter ranges in production brief

MUST NOT DO

• Export unrealsized geometry nodes to game without validation
• Infinite variation without performance testing
• Procedural where manual hero quality required
• Skip UV planning on procedural output
• Hardcode random without seed control

Reference Guide

| Topic | Reference | Load When | |-------|-----------|-----------| | Geo nodes patterns | `../geometry-nodes/SKILL.md` | Node setup | | Environment integration | `../environment-artist/SKILL.md` | Scene placement |