Fix Blender 5.0 compatibility and add console logging for pack operations

Guard DNA field accesses with has_field() checks for fields renamed or
removed across Blender versions (proxy, dup_group, texcomesh, nodetree,
etc.), fix mesh block pointer mismatch in path rewriting, fix mkrelative
IndexError when asset path is shorter than blend file path, and add
[BAT] console prints for tracing progress.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

blender_asset_tracer/bpathlib.py

@@ -75,7 +75,7 @@ class BlendPath(bytes):
         # Remove matching initial parts. What is left in bdir_parts represents
         # the number of '..' we need. What is left in asset_parts represents
         # what we need after the '../../../'.
-        while bdir_parts:
+        while bdir_parts and asset_parts:
             if bdir_parts[0] != asset_parts[0]:
                 break
             bdir_parts.popleft()

blender_asset_tracer/operators.py

@@ -30,8 +30,12 @@ class ExportBatPack(Operator, ExportHelper):
             Path(bpy.data.filepath).parent,
             str(self.filepath),
         ) as packer:
+            print("[BAT] Strategising (tracing dependencies)...")
             packer.strategise()
+            print(f"[BAT] Found {len(packer._actions)} assets to process")
+            print("[BAT] Executing (rewriting paths and copying files)...")
             packer.execute()
+            print("[BAT] Packing complete!")
         self.report({"INFO"}, "Packing successful!")
 
         with zipfile.ZipFile(str(self.filepath)) as inzip:
@@ -123,8 +127,12 @@ class BAT_OT_export_zip(Operator, ExportHelper):
         self.report({"INFO"}, "Packing with hierarchy...")
 
         with packer_cls(bfile, project, target, keep_hierarchy=True) as packer:
+            print("[BAT] Strategising (tracing dependencies)...")
             packer.strategise()
+            print(f"[BAT] Found {len(packer._actions)} assets to process")
+            print("[BAT] Executing (rewriting paths and copying files)...")
             packer.execute()
+            print("[BAT] Packing complete!")
 
         if self.use_zip:
             with zipfile.ZipFile(target) as inzip:

blender_asset_tracer/trace/__init__.py

@@ -64,6 +64,7 @@ def deps(
             if usage_hash in seen_hashes:
                 continue
             seen_hashes.add(usage_hash)
+            print(f"[BAT] Found reference: {block_usage.asset_path} (block {block.code.decode()})")
             yield block_usage
 
 

blender_asset_tracer/trace/blocks2assets.py

@@ -133,14 +133,18 @@ def library(block: blendfile.BlendFileBlock) -> typing.Iterator[result.BlockUsag
 @dna_code("ME")
 def mesh(block: blendfile.BlendFileBlock) -> typing.Iterator[result.BlockUsage]:
     """Mesh data blocks."""
-    block_external = block.get_pointer((b"ldata", b"external"), None)
-    if block_external is None:
-        block_external = block.get_pointer((b"fdata", b"external"), None)
+    block_external = None
+    for field_name in (b"ldata", b"fdata"):
+        if not block.has_field(field_name):
+            continue
+        block_external = block.get_pointer((field_name, b"external"), None)
+        if block_external is not None:
+            break
     if block_external is None:
         return
 
     path, field = block_external.get(b"filename", return_field=True)
-    yield result.BlockUsage(block, path, path_full_field=field)
+    yield result.BlockUsage(block_external, path, path_full_field=field)
 
 
 @dna_code("MC")

blender_asset_tracer/trace/expanders.py

@@ -152,16 +152,20 @@ def _expand_generic_idprops(block: blendfile.BlendFileBlock):
 
 
 def _expand_generic_nodetree_id(block: blendfile.BlendFileBlock):
-    if block.bfile.header.version >= 500 and block.bfile.file_subversion >= 4:
-        # Introduced in Blender 5.0, commit bd61e69be5a7c96f1e5da1c86aafc17b839e049f
+    # compositing_node_group replaced nodetree for Scene blocks in Blender 5.0.
+    if block.has_field(b"compositing_node_group"):
         block_ntree = block.get_pointer(b"compositing_node_group", None)
-    else:
+    elif block.has_field(b"nodetree"):
         block_ntree = block.get_pointer(b"nodetree", None)
+    else:
+        block_ntree = None
     if block_ntree is not None:
         yield from _expand_generic_nodetree(block_ntree)
 
 
 def _expand_generic_animdata(block: blendfile.BlendFileBlock):
+    if not block.has_field(b"adt"):
+        return
     block_adt = block.get_pointer(b"adt")
     if block_adt:
         yield block_adt.get_pointer(b"action")
@@ -187,6 +191,7 @@ def _expand_curve(block: blendfile.BlendFileBlock):
         b"taperobj",
         b"textoncurve",
     ):
+        if block.has_field(fieldname):
             yield block.get_pointer(fieldname)
 
 
@@ -258,8 +263,9 @@ def _expand_metaball(block: blendfile.BlendFileBlock):
 def _expand_mesh(block: blendfile.BlendFileBlock):
     yield from _expand_generic_animdata(block)
     yield from _expand_generic_material(block)
+    # texcomesh was removed in Blender 4.0.
+    if block.has_field(b"texcomesh"):
         yield block.get_pointer(b"texcomesh")
-    # TODO, TexFace? - it will be slow, we could simply ignore :S
 
 
 @dna_code("NT")
@@ -275,10 +281,16 @@ def _expand_object(block: blendfile.BlendFileBlock):
 
     yield block.get_pointer(b"data")
 
-    if block[b"transflag"] & cdefs.OB_DUPLIGROUP:
+    # dup_group was renamed to instance_collection in Blender 2.80.
+    if block.has_field(b"instance_collection"):
+        yield block.get_pointer(b"instance_collection", default=None)
+    elif block[b"transflag"] & cdefs.OB_DUPLIGROUP:
         yield block.get_pointer(b"dup_group")
 
+    # proxy and proxy_group were removed in Blender 3.0.
+    if block.has_field(b"proxy"):
         yield block.get_pointer(b"proxy")
+    if block.has_field(b"proxy_group"):
         yield block.get_pointer(b"proxy_group")
 
     # 'ob->pose->chanbase[...].custom'
@@ -312,10 +324,17 @@ def _expand_particle_settings(block: blendfile.BlendFileBlock):
     yield from _expand_generic_animdata(block)
     yield from _expand_generic_mtex(block)
 
+    # dup_group/dup_ob were renamed to instance_collection/instance_object in Blender 2.80.
     block_ren_as = block[b"ren_as"]
     if block_ren_as == cdefs.PART_DRAW_GR:
+        if block.has_field(b"instance_collection"):
+            yield block.get_pointer(b"instance_collection")
+        else:
             yield block.get_pointer(b"dup_group")
     elif block_ren_as == cdefs.PART_DRAW_OB:
+        if block.has_field(b"instance_object"):
+            yield block.get_pointer(b"instance_object")
+        else:
             yield block.get_pointer(b"dup_ob")
 
 

blender_asset_tracer/trace/file2blocks.py

@@ -69,6 +69,7 @@ class BlockIterator:
         """Open a blend file, sending notification about this to the progress callback."""
 
         log.info("opening: %s", bfilepath)
+        print(f"[BAT] Reading blend file: {bfilepath}")
         self.progress_cb.trace_blendfile(bfilepath)
         return blendfile.open_cached(bfilepath)
 

blender_asset_tracer/trace/modifier_walkers.py

@@ -233,8 +233,12 @@ def modifier_particle_system(
 def modifier_fluid_sim(
     ctx: ModifierContext, modifier: blendfile.BlendFileBlock, block_name: bytes
 ) -> typing.Iterator[result.BlockUsage]:
+    """Legacy fluid sim, removed in Blender 3.0."""
     my_log = log.getChild("modifier_fluid_sim")
 
+    if not modifier.has_field(b"fss"):
+        return
+
     fss = modifier.get_pointer(b"fss")
     if fss is None:
         my_log.debug(
@@ -257,8 +261,12 @@ def modifier_fluid_sim(
 def modifier_smoke_sim(
     ctx: ModifierContext, modifier: blendfile.BlendFileBlock, block_name: bytes
 ) -> typing.Iterator[result.BlockUsage]:
+    """Legacy smoke sim, removed in Blender 2.82 (replaced by Fluid modifier)."""
     my_log = log.getChild("modifier_smoke_sim")
 
+    if not modifier.has_field(b"domain"):
+        return
+
     domain = modifier.get_pointer(b"domain")
     if domain is None:
         my_log.debug(