# Blender Geometry Nodes

Geometry Nodes in Blender 5.2 - fields, domains, attributes, instancing, zones...

- Repository: https://github.com/EL4CTEO/blender-skills (651 stars)
- Category: Engineering
- License: MIT
- Last updated: 2026-10-30
- Runs scripts: yes, review before use

## Install

Claude Code: `npx skills add EL4CTEO/blender-skills --skill blender-geometry-nodes -g -a claude-code -y`
Codex: `npx skills add EL4CTEO/blender-skills --skill blender-geometry-nodes -g -a codex -y`
Cursor: `npx skills add EL4CTEO/blender-skills --skill blender-geometry-nodes -g -a cursor -y`
Gemini CLI: `npx skills add EL4CTEO/blender-skills --skill blender-geometry-nodes -g -a gemini-cli -y`
Claude Code plugin marketplace: `/plugin marketplace add EL4CTEO/blender-skills`

## Description

Geometry Nodes in Blender 5.2 - fields, domains, attributes, instancing, zones (simulation/repeat/for-each), closures/bundles, lists, SDF grids, node tools, baking, plus a JSON-to-node-tree builder and socket inspector. Use for scattering, procedural assets/environments, parametric tools and modifier inputs.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# Geometry Nodes

The execution model is in `blender-core`. Build trees with `scripts/gn_builder.py`, a compact JSON spec that's far cheaper than raw bpy. Look up exact socket names first, because they change between versions:
```
scripts/gn_builder.py -- --describe GeometryNodeDistributePointsOnFaces GeometryNodeInstanceOnPoints
scripts/gn_builder.py -- --spec scatter.json --apply Ground --set Density=20 Seed=3 Mask=@paint_mask
```
`--set Name=@attr` feeds a modifier input from a named attribute. The result reports evaluated vert/face counts and node warnings. The spec format is in the script docstring; full examples are in [references/recipes.md](references/recipes.md).

## Core concepts (get these right or nothing works)
- **Geometry** flows left→right through sockets with **circle** shapes. **Fields** (diamond sockets) are functions evaluated per element **on the node that consumes them**, in that node's domain/context.
- **Domains**: Point, Edge, Face, Face Corner, Spline, Instance, Layer. `Capture Attribute` freezes a field at a point in the graph (before topology changes), and `Evaluate on Domain` converts between domains.
- **Attributes**: built-ins (`position`, `normal`, `sharp_face`, `material_index`, `UVMap`...) plus named ones via `Store Named Attribute`. Named attributes persist after the modifier. That's how GN data reaches shaders (Attribute node) and exporters (glTF `export_attributes`, which exports names starting with `_`).
- **Instances** are cheap (one mesh, many transforms). **Realize Instances** only when you must edit per-instance geometry or export a single mesh. Realize as late as possible.
- Inputs exposed on the group interface become **modifier inputs** (5.2: `mod.properties.inputs.<identifier>.value`). Panels group them, menu sockets give enums.

The rest: https://github.com/EL4CTEO/blender-skills/blob/HEAD/skills/blender-geometry-nodes/SKILL.md