ModelTranslator: support pure-mesh FBX via naming-convention texture discovery and auto material

Tools/ModelTranslator/bl_convert.py

@@ -38,6 +38,17 @@ def decode_sphere_map(enc01):
 
 IMG_EXTS = ('.png', '.jpg', '.jpeg', '.tga', '.exr', '.bmp', '.tif', '.tiff')
 
+# 磁盘贴图命名约定：文件名末段 token -> 贴图槽位
+DISK_MAP_TOKENS = {
+    "color": "basecolor", "basecolor": "basecolor", "albedo": "basecolor",
+    "diffuse": "basecolor",
+    "normal": "normal", "nrm": "normal",
+    "metallic": "metallic", "metalness": "metallic", "metal": "metallic",
+    "roughness": "roughness", "rough": "roughness",
+    "ao": "ao", "occlusion": "ao", "ambient": "ao",
+    "alpha": "alpha", "opacity": "alpha",
+}
+
 
 def _looks_like_ao(name):
     return bool(AO_NAME_RE.search(name))
@@ -54,6 +65,54 @@ def _image_stem(img):
     return os.path.splitext(os.path.basename(path))[0]
 
 
+def _load_disk_image(src_dir, fname, warnings):
+    """加载 FBX 同目录的贴图文件，失败返回 None。"""
+    import bpy
+    try:
+        img = bpy.data.images.load(os.path.join(src_dir, fname), check_existing=True)
+    except RuntimeError as e:
+        warnings.append("贴图 %s 加载失败：%s" % (fname, e))
+        return None
+    if _image_broken(img):
+        warnings.append("贴图 %s 加载失败（0 尺寸）" % fname)
+        return None
+    return img
+
+
+def _find_maps_on_disk(src_dir, model_name, maps, warnings):
+    """材质无任何贴图（如纯网格 FBX）时，按命名约定从 FBX 同目录识别整套贴图。
+    文件按 <前缀>_<token>.<ext> 归组；多套前缀时取与模型同名的一组。"""
+    try:
+        files = sorted(os.listdir(src_dir))
+    except OSError:
+        return
+    groups = {}  # 前缀 -> {槽位: 文件名}
+    for f in files:
+        stem, ext = os.path.splitext(f)
+        if ext.lower() not in IMG_EXTS or "_" not in stem:
+            continue
+        prefix, token = stem.rsplit("_", 1)
+        key = DISK_MAP_TOKENS.get(token.lower())
+        if key:
+            groups.setdefault(prefix, {}).setdefault(key, f)
+    if not groups:
+        return
+    if model_name in groups:
+        chosen = groups[model_name]
+    elif len(groups) == 1:
+        chosen = next(iter(groups.values()))
+    else:
+        warnings.append("同目录有多套命名约定贴图（前缀：%s），无法确定归属，忽略"
+                        % ", ".join(sorted(groups)))
+        return
+    for key, fname in chosen.items():
+        if maps.get(key):
+            continue
+        img = _load_disk_image(src_dir, fname, warnings)
+        if img is not None:
+            maps[key] = (img, None)
+
+
 def _find_ao_on_disk(src_dir, maps, warnings):
     """材质未引用 AO 时，从 FBX 同目录按文件名兜底搜索（烘焙工具常只把 _ao.png 放旁边）。
     多候选时优先与 basecolor 贴图同前缀（xxx_color.png -> xxx_ao.png）。"""
@@ -78,15 +137,7 @@ def _find_ao_on_disk(src_dir, maps, warnings):
         else:
             warnings.append("同目录有多张疑似 AO 贴图无法确定归属，忽略：%s" % ", ".join(cands))
             return None
-    try:
-        img = bpy.data.images.load(os.path.join(src_dir, pick), check_existing=True)
-    except RuntimeError as e:
-        warnings.append("AO 贴图 %s 加载失败：%s" % (pick, e))
-        return None
-    if _image_broken(img):
-        warnings.append("AO 贴图 %s 加载失败（0 尺寸）" % pick)
-        return None
-    return img
+    return _load_disk_image(src_dir, pick, warnings)
 
 
 def _image_pixels(img):
@@ -129,7 +180,7 @@ def _trace_image(socket, warnings, what):
     return None, None
 
 
-def _material_maps(mat, warnings, src_dir):
+def _material_maps(mat, warnings, src_dir, model_name):
     """从材质 Principled BSDF 提取贴图与常量。"""
     maps = {"basecolor": None, "alpha": None, "normal": None,
             "metallic": None, "roughness": None, "ao": None}
@@ -170,6 +221,9 @@ def _material_maps(mat, warnings, src_dir):
                 and not _image_broken(n.image) and _looks_like_ao(n.image.name):
             maps["ao"] = (n.image, None)
             break
+    # 纯网格 FBX：材质一张贴图都没有时，按命名约定从同目录识别整套
+    if not any(maps.values()):
+        _find_maps_on_disk(src_dir, model_name, maps, warnings)
     if maps["ao"] is None:
         img = _find_ao_on_disk(src_dir, maps, warnings)
         if img is not None:
@@ -205,7 +259,7 @@ def _save_png(path, rgba):
 
 def _convert_material(mat, model_name, outdir, max_size, used_snames, src_dir):
     warnings = []
-    maps, consts = _material_maps(mat, warnings, src_dir)
+    maps, consts = _material_maps(mat, warnings, src_dir, model_name)
     tw, th = _target_size(maps, max_size)
 
     # --- 基础贴图 ---
@@ -258,8 +312,10 @@ def _convert_material(mat, model_name, outdir, max_size, used_snames, src_dir):
     used_snames.add(sname)
     if sname != base_sname:
         warnings.append("材质名 %s 清洗后与其它材质重名，输出改用 %s" % (mat.name, sname))
-    base_png = os.path.abspath(os.path.join(outdir, "%s_%s_base.png" % (model_name, sname)))
-    mix_png = os.path.abspath(os.path.join(outdir, "%s_%s_mix.png" % (model_name, sname)))
+    # 材质名与模型名相同（如纯网格 FBX 的兜底材质）时不重复拼接
+    stem = model_name if sname == model_name else "%s_%s" % (model_name, sname)
+    base_png = os.path.abspath(os.path.join(outdir, "%s_base.png" % stem))
+    mix_png = os.path.abspath(os.path.join(outdir, "%s_mix.png" % stem))
     _save_png(base_png, base)
     _save_png(mix_png, mix)
 
@@ -299,6 +355,15 @@ def main():
     bpy.ops.wm.read_factory_settings(use_empty=True)
     bpy.ops.import_scene.fbx(filepath=src)
 
+    # 纯网格 FBX（无材质槽）：以模型名新建材质挂上，否则 Unity 侧没有重映射挂点
+    fallback_mat = None
+    for obj in bpy.data.objects:
+        if obj.type == 'MESH' and not any(s.material for s in obj.material_slots):
+            if fallback_mat is None:
+                fallback_mat = bpy.data.materials.new(model_name)
+                fallback_mat.use_nodes = True
+            obj.data.materials.append(fallback_mat)
+
     used_mats = []
     for obj in bpy.data.objects:
         if obj.type != 'MESH':