P23: GEOMETRY NODES BASICS

ID: P23 | Кластер: Geometry Nodes | Сложность: ⭐⭐ | Теги: #geometry-nodes #procedural #attributes #instances

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🎯 ЦЕЛЬ

Базовый GN-сетап: Group Input/Output, distribute points, instance on points, realize

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📝 ПРОМПТ (РУС)

Создай Geometry Nodes "[GROUP]" на "[OBJECT]":
Входы: [Count, Seed, Scale]
Логика: Distribute Points → Instance Collection → Random Transform

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📝 ПРОМПТ (ENG)

Create Geometry Nodes "[GROUP]" on "[OBJECT]":
Inputs: [Count, Seed, Scale]
Logic: Distribute Points → Instance Collection → Random Transform

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🔧 MCP: execute_blender_code

import bpy

def create_gn_scatter(obj_name, group_name="GN_Scatter", collection_name=None):
    obj = bpy.data.objects.get(obj_name)
    if not obj:
        raise ValueError("Object not found")
    ng = bpy.data.node_groups.new(group_name, 'GeometryNodeTree')
    nodes, links = ng.nodes, ng.links
    nodes.clear()
    inp = nodes.new('NodeGroupInput')
    out = nodes.new('NodeGroupOutput')
    inp.location = (-400, 0); out.location = (400, 0)
    ng.interface.new_socket(name="Count", in_out='INPUT', socket_type='NodeSocketInt')
    ng.interface.new_socket(name="Seed", in_out='INPUT', socket_type='NodeSocketInt')
    ng.interface.new_socket(name="Geometry", in_out='OUTPUT', socket_type='NodeSocketGeometry')
    dist = nodes.new('GeometryNodeDistributePointsOnFaces')
    dist.location = (-100, 0)
    dist.distribute_method = 'POISSON'
    inst = nodes.new('GeometryNodeInstanceOnPoints')
    inst.location = (100, 0)
    real = nodes.new('GeometryNodeRealizeInstances')
    real.location = (300, 0)
    links.new(inp.outputs[0], dist.inputs['Density'])
    links.new(dist.outputs['Points'], inst.inputs['Points'])
    links.new(inst.outputs['Instances'], real.inputs['Geometry'])
    links.new(real.outputs['Geometry'], out.inputs['Geometry'])
    mod = obj.modifiers.new("GN", 'NODES')
    mod.node_group = ng
    return {"group": group_name, "object": obj_name}

# create_gn_scatter("Ground", "GN_Trees")

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📊 КЛЮЧЕВЫЕ НОДЫ

Нода	Назначение
Distribute Points on Faces	Точки по поверхности
Instance on Points	Инстансы коллекции
Realize Instances	Конвертация в геометрию
Random Value	Случайные scale/rotation
Store Named Attribute	Кастомные атрибуты

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🔗 СВЯЗИ

• Прочие в категории «Промпты»: P07: INSTANCING & ARRAYS, P25: PROCEDURAL BUILDING GENERATOR, P45: GEOMETRY NODES SIMULATION ZONES, P01: PRIMITIVE CREATION BASICS, P03: MODIFIERS STACK
• По темам: P04: MESH EDITING (BMESH), P18: DRIVERS & CONSTRAINTS, P22: PARTICLE SYSTEMS
• Теги: #attributes, #geometry, #geometry-nodes, #instances, #modeling, #procedural, #prompt