Compress baked PNGs and tighten XPbr shadows with URP quality tweaks.

Add png_compress to the model pipeline and update TownSquare lighting plus MaleExplorer/plaza textures.

Co-authored-by: Cursor <cursoragent@cursor.com>

Tools/model_tools/bl_convert.py

@@ -9,6 +9,7 @@ import numpy as np
 
 # blender --python 不会把脚本目录加入 sys.path，手动加入以复用 unity_assets（纯 stdlib）
 sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+from png_compress import compress_png, prepare_blender_png
 from unity_assets import safe_name
 
 AO_NAME_RE = re.compile(r"(ao|occlusion|ambient)", re.I)
@@ -269,8 +270,10 @@ def _save_png(path, rgba):
     img.filepath_raw = path
     img.file_format = 'PNG'
     img.alpha_mode = 'CHANNEL_PACKED'
+    prepare_blender_png(100)
     img.save()
     bpy.data.images.remove(img)
+    compress_png(path)
 
 
 def _convert_material(mat, model_name, outdir, max_size, used_snames, src_dir):