P41: DISPLACEMENT & MICRO-DETAIL

ID: P41 | Кластер: Materials/Render | Сложность: ⭐⭐⭐ | Теги: #displacement #adaptive-subdivision #micro-detail #true-displacement #cycles

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🎯 ЦЕЛЬ

Настоящий дисплейсмент: Adaptive Subdivision + 32-bit height + правильные настройки Cycles

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📝 ПРОМПТ (РУС)

Настрой true displacement для "[OBJECT]":
Height map [путь], scale [S], midlevel [M].
Adaptive Subdivision: dicing rate [R]. Проверь силуэт на крупном плане.

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📝 ПРОМПТ (ENG)

Setup true displacement for "[OBJECT]":
Height map [path], scale [S], midlevel [M].
Adaptive Subdivision: dicing rate [R]. Verify silhouette in close-up.

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🔧 MCP: execute_blender_code

import bpy

def true_displacement(obj_name, height_img_path, scale=0.1, midlevel=0.5, dicing=1.0):
    obj = bpy.data.objects.get(obj_name)
    if not obj or obj.type != 'MESH':
        raise ValueError("Mesh object required")
    mat = obj.active_material
    if not mat:
        raise ValueError("Object has no material")
    mat.cycles.displacement_method = 'BOTH'
    nodes = mat.node_tree.nodes
    links = mat.node_tree.links
    tex = nodes.new('ShaderNodeTexImage')
    tex.image = bpy.data.images.load(height_img_path)
    tex.image.colorspace_settings.name = 'Non-Color'
    tex.location = (-400, -300)
    disp = nodes.new('ShaderNodeDisplacement')
    disp.location = (-100, -300)
    disp.inputs['Scale'].default_value = scale
    disp.inputs['Midlevel'].default_value = midlevel
    out = next(n for n in nodes if n.type == 'OUTPUT_MATERIAL')
    links.new(tex.outputs['Color'], disp.inputs['Height'])
    links.new(disp.outputs['Displacement'], out.inputs['Displacement'])
    sub = obj.modifiers.new("AdaptiveSubdiv", 'SUBSURF')
    sub.subdivision_type = 'CATMULL_CLARK'
    sub.use_adaptive_subdiv = True
    s = bpy.context.scene
    s.cycles.feature_set = 'EXPERIMENTAL'
    s.cycles.preview_dicing_rate = dicing
    s.cycles.dicing_rate = max(0.5, dicing / 2)
    return {"displacement": True, "scale": scale}

# true_displacement("Ground", "//textures/ground_height_4k.exr", scale=0.15)

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📊 ПАРАМЕТРЫ

Параметр	Значение	Зачем
Height map	32-bit EXR	Без бандинга на плавных склонах
Scale	0.05–0.3	Реальная высота рельефа в метрах
Midlevel	0.5	Точка «ноль» (ниже — впадины, выше — выступы)
Dicing rate	1.0 preview / 0.5 render	Детализация сабдива
Feature set	EXPERIMENTAL	Обязателен для adaptive

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⚠️ ОШИБКИ

Ошибка	Решение
Плоский силуэт	Displacement method = Both/True, а не Bump Only
Взрыв геометрии	Scale слишком большой; проверь единицы midlevel
Шум/артефакты	Height в Non-Color, 32-bit, dicing меньше

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🔗 СВЯЗИ

• Прочие в категории «Промпты»: P48: EEVEE VS CYCLES DECISION, P09: PRINCIPLED BSDF SETUP, P10: NODE GROUP CREATION, P11: PROCEDURAL TEXTURES, P14: CAMERA & COMPOSITION
• По темам: CASE 03: PRODUCT VISUALIZATION, P22: PARTICLE SYSTEMS, P29: BATCH PROCESSING & CLI
• Теги: #adaptive, #adaptive-subdivision, #cycles, #displacement, #micro, #micro-detail, #prompt, #render, #shading, #true