ModelTranslator: 减面 ratio/容差纯逻辑（TDD）

2026-07-16 10:36:01 +08:00
parent da935926c7
commit 8ede09f859
2 changed files with 64 additions and 0 deletions
@@ -0,0 +1,24 @@
+"""Blender 内运行：FBX 减面到指定三角面数 + Smart UV 重展。
+调用：blender -b --factory-startup --python bl_decimate.py -- <src.fbx> <out.fbx> <target_tris>
+"""
+import os
+import sys
+
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+
+TOLERANCE = 0.03    # 面数相对误差容忍
+MAX_RETRY = 2       # ratio 修正轮数上限
+
+
+def decimate_ratio(target, cur):
+    """Decimate collapse ratio；cur <= target 或非法时返回 1.0（不减面）。"""
+    if cur <= 0 or cur <= target:
+        return 1.0
+    return target / float(cur)
+
+
+def within_tolerance(target, actual, tol=TOLERANCE):
+    """减面结果是否落在目标 ±tol 内。"""
+    if target <= 0:
+        return False
+    return abs(actual - target) <= target * tol