ModelTranslator: dedupe sanitized material names, set alphaIsTransparency for alpha-test textures

Tools/ModelTranslator/bl_convert.py

@@ -132,7 +132,7 @@ def _channel(pixels, ch):
     return pixels[..., ch if ch is not None else 0]
 
 
-def _save_png(path, rgba, srgb_view=False):
+def _save_png(path, rgba):
     """float32 (h,w,4) -> PNG。写原始值（Non-Color，避免色彩管理改写数据）。"""
     import bpy
     h, w = rgba.shape[:2]
@@ -146,7 +146,7 @@ def _save_png(path, rgba, srgb_view=False):
     bpy.data.images.remove(img)
 
 
-def _convert_material(mat, model_name, outdir, max_size):
+def _convert_material(mat, model_name, outdir, max_size, used_snames):
     warnings = []
     maps, consts = _material_maps(mat, warnings)
     tw, th = _target_size(maps, max_size)
@@ -192,7 +192,15 @@ def _convert_material(mat, model_name, outdir, max_size):
     else:
         mix[..., 3] = consts["roughness"]
 
-    sname = safe_name(mat.name)
+    # 中文等非 ASCII 材质名会同样退化（如都变 "mat"），加序号防止互相覆盖
+    sname = base_sname = safe_name(mat.name)
+    n = 1
+    while sname in used_snames:
+        n += 1
+        sname = "%s_%d" % (base_sname, n)
+    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)))
     _save_png(base_png, base)
@@ -242,7 +250,9 @@ def main():
             if slot.material and slot.material not in used_mats:
                 used_mats.append(slot.material)
 
-    results = [_convert_material(m, model_name, outdir, max_size) for m in used_mats]
+    used_snames = set()
+    results = [_convert_material(m, model_name, outdir, max_size, used_snames)
+               for m in used_mats]
 
     _strip_textures()
     fbx_out = os.path.join(outdir, model_name + ".fbx")
@@ -253,5 +263,5 @@ def main():
         ensure_ascii=False))
 
 
-if __name__ == "__main__" and "--" in __import__("sys").argv:
+if __name__ == "__main__" and "--" in sys.argv:
     main()