.gitignore

@@ -10,7 +10,4 @@ __pycache__
 /dist/
 /build/
 
-/docs/_build
-
-/.env
-/.venv
+/docs/_build

blender_asset_tracer/blendfile/__init__.py

@@ -127,7 +127,9 @@ class BlendFile:
         self.blocks = []  # type: BFBList
         """BlendFileBlocks of this file, in disk order."""
 
-        self.code_index = collections.defaultdict(list)  # type: typing.Dict[bytes, BFBList]
+        self.code_index = collections.defaultdict(
+            list
+        )  # type: typing.Dict[bytes, BFBList]
         self.structs = []  # type: typing.List[dna.Struct]
         self.sdna_index_from_id = {}  # type: typing.Dict[bytes, int]
         self.block_from_addr = {}  # type: typing.Dict[int, BlendFileBlock]

blender_asset_tracer/blendfile/iterators.py

@@ -20,6 +20,7 @@
 # (c) 2014, Blender Foundation - Campbell Barton
 # (c) 2018, Blender Foundation - Sybren A. Stüvel
 import typing
+import copy
 
 from blender_asset_tracer import cdefs
 from . import BlendFileBlock
@@ -72,26 +73,22 @@ def modifiers(object_block: BlendFileBlock) -> typing.Iterator[BlendFileBlock]:
     yield from listbase(mods, next_path=(b"modifier", b"next"))
 
 
-def copy_block(block: BlendFileBlock) -> BlendFileBlock:
-    """Create a new BlendFileBlock instance with the same slot data as the provided block."""
-    if not isinstance(block, BlendFileBlock):
-        raise ValueError("The existing_block must be an instance of BlendFileBlock")
-
-    new_block = BlendFileBlock(block.bfile)
-
-    for slot in BlendFileBlock.__slots__:
-        setattr(new_block, slot, getattr(block, slot))
-
-    return new_block
-
-
 def dynamic_array(block: BlendFileBlock) -> typing.Iterator[BlendFileBlock]:
-    """Generator, yields all blocks in a block that is a dynamic array."""
+    """
+    Generator that yields each element of a dynamic array as a separate block.
+    
+    Dynamic arrays are multiple contiguous elements accessed via a single pointer.
+    BAT interprets these as a single data block, making it hard to access individual elements.
+    This function divides the array into individual blocks by creating modified copies of the original block.
+    """
+
     offset = block.file_offset
+    element_size = block.dna_type.size
+
     for i in range(block.count):
-        new_block = copy_block(block)
+        new_block = copy.copy(block)
         new_block.file_offset = offset
-        new_block.size = block.dna_type.size // block.count
+        new_block.size = element_size
 
         yield new_block
-        offset += block.dna_type.size
+        offset += element_size

blender_asset_tracer/cdefs.py

@@ -52,6 +52,9 @@ eModifierType_MeshSequenceCache = 52
 eModifierType_Fluid = 56
 eModifierType_Nodes = 57
 
+# NodesModifierBakeFlag
+NODES_MODIFIER_BAKE_CUSTOM_PATH = 1 << 1
+
 # DNA_particle_types.h
 PART_DRAW_OB = 7
 PART_DRAW_GR = 8
@@ -101,4 +104,4 @@ PTCACHE_PATH = b"blendcache_"
 
 # BKE_node.h
 SH_NODE_TEX_IMAGE = 143
-CMP_NODE_R_LAYERS = 221
+CMP_NODE_R_LAYERS = 221

blender_asset_tracer/trace/modifier_walkers.py

@@ -369,9 +369,7 @@ def modifier_nodes(
         )
 
         flag = bake.get(b"flag")
-        flag_bin = bin(flag)
-        flag_bin_padded = flag_bin[2:].zfill(2)
-        use_custom_directory = flag_bin_padded[0] == "1"
+        use_custom_directory = bool(flag & cdefs.NODES_MODIFIER_BAKE_CUSTOM_PATH)
 
         if use_custom_directory:
             directory_ptr = bake_directory_ptr
@@ -382,7 +380,7 @@ def modifier_nodes(
             field = mod_directory_field
             block = modifier
 
-        if directory_ptr == 0:
+        if not directory_ptr:
             continue
         directory = bake.bfile.dereference_pointer(directory_ptr)
         if not directory: