82 lines
3.3 KiB
Python
82 lines
3.3 KiB
Python
"""QR 桥纯逻辑:引擎发现、面数换算、settings 生成、progress 解析。不 import bpy。
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减面可选后端 Quad Remesher 用——headless 直接调 Engine/xremesh.exe,绕开 modal 操作符。"""
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import glob
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import os
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QR_TIMEOUT = 120.0 # 引擎轮询超时(秒)
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QR_INPUT_CAP = 50000 # quad 后端 QR 前预 collapse 的中等密度目标面数
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QR_HOLE_MAX_SIDES = 6 # 补洞上限边数:只补 <=6 边的薄部位小洞
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QR_CATASTROPHIC_TOL = 12 # 软水密门容忍:补洞后仍多出超此数的开边/非流形才判灾难性
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def find_qr_engine():
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"""定位 QuadRemesher 的 xremesh.exe;找不到返回 None。
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顺序:QR_ENGINE 环境变量(权威:显式设了就以它为准,无效即 None,不再自动发现)
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-> 标准 addon 路径(取字典序最大目录,当前 Blender 5.x 下即最高版本)。"""
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env = os.environ.get("QR_ENGINE")
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if env:
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return env if os.path.isfile(env) else None
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appdata = os.environ.get("APPDATA")
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if not appdata:
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return None
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pattern = os.path.join(
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appdata, "Blender Foundation", "Blender", "*",
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"scripts", "addons", "QuadRemesher", "Engine", "xremesh.exe")
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hits = sorted(glob.glob(pattern))
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return hits[-1] if hits else None
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def tris_to_target_quads(tris):
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"""三角面数换算 QR 目标四边形数:1 quad ≈ 2 tris,至少 1。"""
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return max(1, int(tris) // 2)
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def build_settings(in_fbx, out_fbx, prog, target_quads,
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adaptive=50, exact=False, hard_edges=True):
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"""生成 RetopoSettings.txt 文本(xremesh.exe -s 读取)。"""
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lines = [
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"HostApp=Blender",
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'FileIn="%s"' % in_fbx,
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'FileOut="%s"' % out_fbx,
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'ProgressFile="%s"' % prog,
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"TargetQuadCount=%d" % target_quads,
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"CurvatureAdaptivness=%d" % adaptive,
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"ExactQuadCount=%d" % (1 if exact else 0),
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"UseVertexColorMap=False",
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"UseMaterialIds=0",
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"UseIndexedNormals=0",
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"AutoDetectHardEdges=%d" % (1 if hard_edges else 0),
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]
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return "\n".join(lines) + "\n"
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def parse_progress(text):
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"""解析 progress.txt -> (state, msg)。
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首行 '2'=success;<0=error(次行为文本);空/分数/非法=running。"""
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lines = text.splitlines()
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if not lines:
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return ("running", "")
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try:
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v = float(lines[0])
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except ValueError:
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return ("running", "")
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if v == 2:
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return ("success", "")
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if v < 0:
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return ("error", lines[1] if len(lines) > 1 else "")
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return ("running", "")
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def topology_acceptable(src_boundary, src_nonmanifold,
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out_boundary, out_nonmanifold, tol=0):
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"""QR 输出拓扑是否可接受:不比输入多出超过 tol 的开边(孔洞)/非流形边。
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tol=0(默认)为零容忍严格门;quad 后端补小洞后用 tol=QR_CATASTROPHIC_TOL 只挡灾难性破损。"""
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return (out_boundary <= src_boundary + tol
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and out_nonmanifold <= src_nonmanifold + tol)
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def precollapse_target(face_count, cap=QR_INPUT_CAP):
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"""QR 前预 collapse 目标:面数 > cap 返回 cap(先减到中等密度),否则 None(跳过)。
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高密度网格直接 QR 必破洞,先 collapse 到中等密度给 QR 一个稳定输入。"""
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return cap if face_count > cap else None
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