41 lines
1.5 KiB
Python
41 lines
1.5 KiB
Python
"""Blender 内运行：高低模 Cycles 烘焙，低模 UV 上出 normal/ao/color/metallic/roughness。
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调用：blender -b --factory-startup --python bl_bake.py -- \
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<high.fbx> <low.fbx> <outdir> <size> <ray_distance|auto> <samples>
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"""
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import math
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import os
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import sys
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sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
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DEFAULT_RAY_PCT = 0.02 # 自动射线距离 = 低模包围盒对角线 * 2%
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BBOX_TOL = 0.10 # 高低模包围盒尺寸相对差警告阈值
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# (输出名, bake type, EMIT 来源的 Principled 输入, 目标图颜色空间)
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BAKE_PASSES = [
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("normal", 'NORMAL', None, 'Non-Color'),
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("ao", 'AO', None, 'Non-Color'),
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("color", 'EMIT', 'Base Color', 'sRGB'),
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("metallic", 'EMIT', 'Metallic', 'Non-Color'),
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("roughness", 'EMIT', 'Roughness', 'Non-Color'),
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]
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def estimate_ray_distance(bbox_dims, pct=DEFAULT_RAY_PCT):
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"""低模包围盒尺寸 (dx,dy,dz) -> 射线距离 = 对角线长 * pct。"""
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return math.sqrt(sum(d * d for d in bbox_dims)) * pct
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def output_stem(low_name):
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"""低模名去掉 _low 后缀作为输出前缀（对齐工具3纯网格贴图命名约定）。"""
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return low_name[:-4] if low_name.endswith("_low") else low_name
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def bbox_mismatch(high_dims, low_dims, tol=BBOX_TOL):
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"""任一轴尺寸相对差超 tol 返回 True；接近 0 的轴忽略（平面模型）。"""
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for h, l in zip(high_dims, low_dims):
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m = max(abs(h), abs(l))
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if m > 1e-9 and abs(h - l) / m > tol:
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return True
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return False
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