Support for cloth ptcaches stored on disk

Currently pointcaches on disk for cloth sims were not traced. This patch allows the tracing of pointcaches for cloth sims.

Reviewers: sybren, fsiddi

Reviewed By: sybren

Differential Revision: https://developer.blender.org/D3910

blender_asset_tracer/cdefs.py

@@ -38,6 +38,7 @@ eModifierType_Wave = 7
 eModifierType_Displace = 14
 eModifierType_UVProject = 15
 eModifierType_ParticleSystem = 19
+eModifierType_Cloth = 22
 eModifierType_Fluidsim = 26
 eModifierType_Smokesim = 31
 eModifierType_WeightVGEdit = 36

blender_asset_tracer/trace/modifier_walkers.py

@@ -223,3 +223,13 @@ def modifier_smoke_sim(ctx: ModifierContext, modifier: blendfile.BlendFileBlock,
       cdefs.PTCACHE_FILE_OPENVDB: cdefs.PTCACHE_EXT_VDB
     }
     yield from _walk_point_cache(ctx, block_name, modifier.bfile, pointcache, extensions[format])
+
+
+@mod_handler(cdefs.eModifierType_Cloth)
+def modifier_cloth(ctx: ModifierContext, modifier: blendfile.BlendFileBlock, block_name: bytes) \
+        -> typing.Iterator[result.BlockUsage]:
+    pointcache = modifier.get_pointer(b'point_cache')
+    if pointcache is None:
+        return
+
+    yield from _walk_point_cache(ctx, block_name, modifier.bfile, pointcache, cdefs.PTCACHE_EXT)