Commit: 9edeff8a045033d3f68225b95265880a70442dd0
Author: Lukas Tönne
Date: Wed Mar 4 18:29:15 2015 +0100
Branches: alembic_pointcache
https://developer.blender.org/rB9edeff8a045033d3f68225b95265880a70442dd0
Left a comment in DerivedMesh.c explaining why the caching system has
to use the cumbersome cachedm pointer instead of virtual modifiers.
===================================================================
M source/blender/blenkernel/intern/DerivedMesh.c
===================================================================
diff --git a/source/blender/blenkernel/intern/DerivedMesh.c
b/source/blender/blenkernel/intern/DerivedMesh.c
index affc104..9aaedc6 100644
--- a/source/blender/blenkernel/intern/DerivedMesh.c
+++ b/source/blender/blenkernel/intern/DerivedMesh.c
@@ -1564,6 +1564,11 @@ static void mesh_calc_modifiers(Scene *scene, Object
*ob, float (*inputVertexCos
modifiers_clearErrors(ob);
+ /* XXX it would be nicer to treat caching as a virtual modifier (when
no actual cache modifier is used).
+ * However, the virtual modifiers work by setting their own 'next'
pointers without touching actual
+ * modifier DNA. This is possible only for prepending at the beginning,
but not for appending
+ * at the end of the modifier stack.
+ */
if (BKE_cache_read_derived_mesh(G.main, scene, scene->r.cfra,
cache_eval_mode, ob, &cachedm)) {
CacheModifierData *cmd = (CacheModifierData
*)mesh_find_cache_modifier(scene, ob, required_mode);
if (cmd) {
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