Commit: 2f766f8ad2ad6e1827468cd0e33c30672663e704
Author: Sergey Sharybin
Date:   Wed Aug 26 14:27:44 2015 +0200
Branches: master
https://developer.blender.org/rB2f766f8ad2ad6e1827468cd0e33c30672663e704

Fix T45709: Cached Hair system is not seen in 2.75

Don't force re-distribution of cached particle systems, this doesn't
cause actual evaluation of particles and there was a reason why particles
are baked actually..

===================================================================

M       source/blender/blenloader/intern/versioning_270.c

===================================================================

diff --git a/source/blender/blenloader/intern/versioning_270.c 
b/source/blender/blenloader/intern/versioning_270.c
index 1e309f5..6af6a7a 100644
--- a/source/blender/blenloader/intern/versioning_270.c
+++ b/source/blender/blenloader/intern/versioning_270.c
@@ -42,6 +42,7 @@
 #include "DNA_sequence_types.h"
 #include "DNA_space_types.h"
 #include "DNA_screen_types.h"
+#include "DNA_object_force.h"
 #include "DNA_object_types.h"
 #include "DNA_mesh_types.h"
 #include "DNA_modifier_types.h"
@@ -654,7 +655,9 @@ void blo_do_versions_270(FileData *fd, Library 
*UNUSED(lib), Main *main)
                        ParticleSystem *psys;
                        for (ob = main->object.first; ob; ob = ob->id.next) {
                                for (psys = ob->particlesystem.first; psys; 
psys = psys->next) {
-                                       psys->recalc |= PSYS_RECALC_RESET;
+                                       if ((psys->pointcache->flag & 
PTCACHE_BAKED) == 0) {
+                                               psys->recalc |= 
PSYS_RECALC_RESET;
+                                       }
                                }
                        }
                }

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