From c718fb3a41d618bcbdb86ab4551c2b1a61e2e6d9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sybren=20A=2E=20St=C3=BCvel?= <sybren@stuvel.eu>
Date: Wed, 20 Mar 2019 11:14:23 +0100
Subject: [PATCH] Support the Mesh Sequence Cache modifier (a.k.a. Alembic
 files)

---
 blender_asset_tracer/cdefs.py                  |  1 +
 blender_asset_tracer/trace/modifier_walkers.py | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/blender_asset_tracer/cdefs.py b/blender_asset_tracer/cdefs.py
index e9a7709..0a49988 100644
--- a/blender_asset_tracer/cdefs.py
+++ b/blender_asset_tracer/cdefs.py
@@ -46,6 +46,7 @@ eModifierType_WeightVGMix = 37
 eModifierType_WeightVGProximity = 38
 eModifierType_Ocean = 39
 eModifierType_MeshCache = 46
+eModifierType_MeshSequenceCache = 52
 
 # DNA_particle_types.h
 PART_DRAW_OB = 7
diff --git a/blender_asset_tracer/trace/modifier_walkers.py b/blender_asset_tracer/trace/modifier_walkers.py
index c7a7f87..32e59ea 100644
--- a/blender_asset_tracer/trace/modifier_walkers.py
+++ b/blender_asset_tracer/trace/modifier_walkers.py
@@ -62,6 +62,17 @@ def modifier_filepath(ctx: ModifierContext, modifier: blendfile.BlendFileBlock,
     yield result.BlockUsage(modifier, path, path_full_field=field, block_name=block_name)
 
 
+@mod_handler(cdefs.eModifierType_MeshSequenceCache)
+def modifier_mesh_sequence_cache(ctx: ModifierContext, modifier: blendfile.BlendFileBlock,
+                                 block_name: bytes) -> typing.Iterator[result.BlockUsage]:
+    """Yield the Alembic file(s) used by this modifier"""
+    cache_file = modifier.get_pointer(b'cache_file')
+    path, field = cache_file.get(b'filepath', return_field=True)
+
+    yield result.BlockUsage(cache_file, path, path_full_field=field,
+                            block_name=b'%s.cache_file' % block_name)
+
+
 @mod_handler(cdefs.eModifierType_Ocean)
 def modifier_ocean(ctx: ModifierContext, modifier: blendfile.BlendFileBlock, block_name: bytes) \
         -> typing.Iterator[result.BlockUsage]: