Fix T61124: Lag on physics simulation

Need to synchronize simulated frame back to original object.

Solves the lag during transformation, but amount of floppyness is
lower for some reason. Final animated object behaves the same as
in older Blender though.

1 files changed, 13 insertions, 3 deletions

diff --git a/source/blender/blenkernel/intern/softbody.c b/source/blender/blenkernel/intern/softbody.c
index 133d645a279..86791512dc6 100644
--- a/source/blender/blenkernel/intern/softbody.c
+++ b/source/blender/blenkernel/intern/softbody.c
@@ -3344,6 +3344,16 @@ static void softbody_step(struct Depsgraph *depsgraph, Scene *scene, Object *ob,
 	}
 }
 
+static void sbStoreLastFrame(struct Depsgraph *depsgraph, Object *object, float framenr)
+{
+	if (!DEG_is_active(depsgraph)) {
+		return;
+	}
+	Object *object_orig = DEG_get_original_object(object);
+	object->soft->last_frame = framenr;
+	object_orig->soft->last_frame = framenr;
+}
+
 /* simulates one step. framenr is in frames */
 void sbObjectStep(struct Depsgraph *depsgraph, Scene *scene, Object *ob, float cfra, float (*vertexCos)[3], int numVerts)
 {
@@ -3415,7 +3425,7 @@ void sbObjectStep(struct Depsgraph *depsgraph, Scene *scene, Object *ob, float c
 		BKE_ptcache_validate(cache, framenr);
 		cache->flag &= ~PTCACHE_REDO_NEEDED;
 
-		sb->last_frame = framenr;
+		sbStoreLastFrame(depsgraph, ob, framenr);
 
 		return;
 	}
@@ -3436,7 +3446,7 @@ void sbObjectStep(struct Depsgraph *depsgraph, Scene *scene, Object *ob, float c
 		if (cache_result == PTCACHE_READ_INTERPOLATED && cache->flag & PTCACHE_REDO_NEEDED && can_write_cache)
 			BKE_ptcache_write(&pid, framenr);
 
-		sb->last_frame = framenr;
+		sbStoreLastFrame(depsgraph, ob, framenr);
 
 		return;
 	}
@@ -3471,5 +3481,5 @@ void sbObjectStep(struct Depsgraph *depsgraph, Scene *scene, Object *ob, float c
 	BKE_ptcache_validate(cache, framenr);
 	BKE_ptcache_write(&pid, framenr);
 
-	sb->last_frame = framenr;
+	sbStoreLastFrame(depsgraph, ob, framenr);
 }