feat(tools): 白模关卡自动生成Python脚本——Level Builder
两阶段流水线：搭建指南Markdown → JSON → UE5 Actor - 解析器：4种表格变体+范围展开+坐标表达式计算 - 配置：37种BSP资产映射+13种材质+7区域定义 - 验证：265个Actor全部通过，0错误 - Builder：UE5 Python API自动放置Actor+材质+Outliner - 报告：自动生成搭建报告Markdown Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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"""UE5 场景构建器。
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在 UE5 编辑器的 Python 环境中运行。读取 JSON 中间数据，
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使用 unreal Python API 创建 Actor、设置 Transform/材质/Outliner 文件夹。
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使用方式：
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在 UE5 编辑器 Output Log 中切换到 Python，执行：
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exec(open(r"path/to/scene_builder.py").read())
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build_level(r"path/to/level_v01.json")
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"""
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import json
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import logging
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import sys
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from pathlib import Path
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# 尝试导入 unreal，失败时给出提示
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try:
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import unreal
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HAS_UNREAL = True
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except ImportError:
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HAS_UNREAL = False
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# 将项目根目录加入 sys.path 以支持 config 导入
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_SCRIPT_DIR = Path(__file__).resolve().parent
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_TOOLS_DIR = _SCRIPT_DIR.parent.parent.parent
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if str(_TOOLS_DIR) not in sys.path:
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sys.path.insert(0, str(_TOOLS_DIR))
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from tools.level_builder.config.asset_mapping import MESH_ASSETS
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from tools.level_builder.config.material_mapping import MATERIAL_PATHS
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logger = logging.getLogger("level_builder.builder")
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def build_level(json_path: str, clear_existing: bool = True, zones: list[str] = None):
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"""从 JSON 数据构建 UE5 关卡。
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Args:
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json_path: 中间 JSON 文件路径。
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clear_existing: 是否清除已有的 LVL_* Actor。
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zones: 仅构建指定区域（如 ["Z1", "Z3"]），None 表示全部。
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"""
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if not HAS_UNREAL:
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print("[错误] 未检测到 unreal 模块。此脚本必须在 UE5 编辑器 Python 环境中运行。")
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return
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# 加载数据
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data = _load_json(json_path)
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if not data:
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return
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actors = data.get("actors", [])
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print(f"[LevelBuilder] 加载 {len(actors)} 个 Actor 定义")
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# 可选：清除已有 LVL_* Actor
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if clear_existing:
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_clear_existing_actors()
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# 过滤区域
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if zones:
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actors = [a for a in actors if a.get("zone_id") in zones or a.get("zone_id") == "GLOBAL"]
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print(f"[LevelBuilder] 过滤为 {len(actors)} 个 Actor（区域: {zones}）")
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# 获取编辑器子系统
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editor_subsystem = unreal.get_editor_subsystem(unreal.EditorActorSubsystem)
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if not editor_subsystem:
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print("[错误] 无法获取 EditorActorSubsystem")
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return
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# 统计
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success = 0
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failed = 0
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build_log = []
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for i, actor_def in enumerate(actors):
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name = actor_def.get("actor_name", f"Actor_{i}")
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asset_type = actor_def.get("asset_type", "static_mesh")
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try:
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if asset_type == "player_start":
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actor = _spawn_player_start(editor_subsystem, actor_def)
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elif asset_type == "directional_light":
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actor = _spawn_directional_light(editor_subsystem, actor_def)
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elif asset_type == "sky_light":
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actor = _spawn_sky_light(editor_subsystem, actor_def)
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elif asset_type == "point_light":
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actor = _spawn_point_light(editor_subsystem, actor_def)
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else:
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actor = _spawn_mesh_actor(editor_subsystem, actor_def)
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if actor:
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success += 1
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build_log.append({"name": name, "status": "ok", **actor_def})
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else:
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failed += 1
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build_log.append({"name": name, "status": "failed", "reason": "spawn returned None"})
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except Exception as e:
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failed += 1
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error_msg = str(e)
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build_log.append({"name": name, "status": "error", "reason": error_msg})
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print(f" [错误] {name}: {error_msg}")
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# 进度
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if (i + 1) % 20 == 0:
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print(f" 进度: {i + 1}/{len(actors)} ({success} 成功, {failed} 失败)")
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print(f"\n[LevelBuilder] 构建完成!")
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print(f" 成功: {success}")
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print(f" 失败: {failed}")
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print(f" 总计: {len(actors)}")
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# 保存构建日志
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log_path = Path(json_path).parent / "build_log.json"
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with open(log_path, "w", encoding="utf-8") as f:
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json.dump(build_log, f, ensure_ascii=False, indent=2)
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print(f" 日志: {log_path}")
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return build_log
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def _load_json(path: str) -> dict:
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"""加载 JSON 文件。"""
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try:
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with open(path, "r", encoding="utf-8") as f:
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return json.load(f)
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except Exception as e:
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print(f"[错误] 无法加载 JSON: {e}")
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return None
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def _clear_existing_actors():
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"""清除场景中所有 LVL_ 前缀的 Actor。"""
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editor_subsystem = unreal.get_editor_subsystem(unreal.EditorActorSubsystem)
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all_actors = unreal.EditorLevelLibrary.get_all_level_actors()
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lvl_actors = [a for a in all_actors if a.get_actor_label().startswith("LVL_")]
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if lvl_actors:
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print(f"[LevelBuilder] 清除 {len(lvl_actors)} 个已有 LVL_* Actor...")
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for a in lvl_actors:
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unreal.EditorLevelLibrary.destroy_actor(a)
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else:
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print("[LevelBuilder] 无已有 LVL_* Actor 需清除")
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def _spawn_mesh_actor(editor_subsystem, actor_def: dict):
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"""生成 StaticMesh Actor。"""
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asset_key = actor_def.get("asset_key", "")
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if not asset_key or asset_key not in MESH_ASSETS:
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print(f" [警告] {actor_def['actor_name']}: 资产 '{asset_key}' 未找到，使用默认 Cube")
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asset_key = "Cube"
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mesh_path = MESH_ASSETS[asset_key]["path"]
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static_mesh = unreal.load_asset(mesh_path)
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if not static_mesh:
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print(f" [警告] {actor_def['actor_name']}: 无法加载资产 '{mesh_path}'")
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return None
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# 生成
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loc = actor_def.get("location", [0, 0, 0])
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actor = editor_subsystem.spawn_actor_from_object(
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static_mesh,
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unreal.Vector(loc[0], loc[1], loc[2])
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)
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if not actor:
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return None
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# 设置 Transform
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rot = actor_def.get("rotation", [0, 0, 0])
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actor.set_actor_rotation(unreal.Rotator(rot[0], rot[1], rot[2]))
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scale = actor_def.get("scale", [1, 1, 1])
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actor.set_actor_scale3d(unreal.Vector(scale[0], scale[1], scale[2]))
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# 设置材质
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material_name = actor_def.get("material", "")
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if material_name and material_name in MATERIAL_PATHS:
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mat_path = MATERIAL_PATHS[material_name]
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material = unreal.load_asset(mat_path)
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if material:
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mesh_comp = actor.get_component_by_class(unreal.StaticMeshComponent)
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if mesh_comp:
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mesh_comp.set_material(0, material)
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# 设置名称和文件夹
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actor.set_actor_label(actor_def["actor_name"])
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folder = actor_def.get("folder", "")
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if folder:
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actor.set_folder_path(folder)
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return actor
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def _spawn_player_start(editor_subsystem, actor_def: dict):
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"""生成 PlayerStart Actor。"""
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loc = actor_def.get("location", [0, 0, 0])
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actor = editor_subsystem.spawn_actor_from_class(
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unreal.PlayerStart,
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unreal.Vector(loc[0], loc[1], loc[2])
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)
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if actor:
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rot = actor_def.get("rotation", [0, 0, 0])
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actor.set_actor_rotation(unreal.Rotator(rot[0], rot[1], rot[2]))
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actor.set_actor_label(actor_def["actor_name"])
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folder = actor_def.get("folder", "")
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if folder:
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actor.set_folder_path(folder)
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return actor
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def _spawn_directional_light(editor_subsystem, actor_def: dict):
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"""生成 DirectionalLight Actor。"""
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loc = actor_def.get("location", [0, 0, 500])
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actor = editor_subsystem.spawn_actor_from_class(
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unreal.DirectionalLight,
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unreal.Vector(loc[0], loc[1], loc[2])
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)
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if actor:
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rot = actor_def.get("rotation", [-45, 315, 0])
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actor.set_actor_rotation(unreal.Rotator(rot[0], rot[1], rot[2]))
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actor.set_actor_label(actor_def["actor_name"])
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folder = actor_def.get("folder", "")
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if folder:
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actor.set_folder_path(folder)
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return actor
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def _spawn_sky_light(editor_subsystem, actor_def: dict):
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"""生成 SkyLight Actor。"""
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loc = actor_def.get("location", [0, 0, 0])
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actor = editor_subsystem.spawn_actor_from_class(
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unreal.SkyLight,
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unreal.Vector(loc[0], loc[1], loc[2])
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)
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if actor:
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actor.set_actor_label(actor_def["actor_name"])
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folder = actor_def.get("folder", "")
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if folder:
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actor.set_folder_path(folder)
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return actor
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def _spawn_point_light(editor_subsystem, actor_def: dict):
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"""生成 PointLight Actor。"""
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loc = actor_def.get("location", [0, 0, 0])
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actor = editor_subsystem.spawn_actor_from_class(
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unreal.PointLight,
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unreal.Vector(loc[0], loc[1], loc[2])
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)
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if actor:
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actor.set_actor_label(actor_def["actor_name"])
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folder = actor_def.get("folder", "")
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if folder:
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actor.set_folder_path(folder)
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return actor
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