fix .. hum not really a bug but waste of CPU

remove 6 multiplications and one square root in core spring calculation .. called for every solver step try 

1 files changed, 2 insertions, 4 deletions

diff --git a/source/blender/blenkernel/intern/softbody.c b/source/blender/blenkernel/intern/softbody.c
index bd9d1cb75ca..fdc03a88230 100644
--- a/source/blender/blenkernel/intern/softbody.c
+++ b/source/blender/blenkernel/intern/softbody.c
@@ -2307,9 +2307,8 @@ static void softbody_calc_forces(Object *ob, float forcetime, float timenow)
 						}
 
 						if (( (sb->totpoint-a) == bs->v1) ){ 
-							actspringlen= VecLenf( (bproot+bs->v2)->pos, bp->pos);
 							VecSubf(sd,(bproot+bs->v2)->pos, bp->pos);
-							Normalize(sd);
+							actspringlen=Normalize(sd);
 							
 							/* friction stuff V1 */
 							VecSubf(velgoal,bp->vec,(bproot+bs->v2)->vec);
@@ -2330,9 +2329,8 @@ static void softbody_calc_forces(Object *ob, float forcetime, float timenow)
 						}
 						
 						if (( (sb->totpoint-a) == bs->v2) ){ 
-							actspringlen= VecLenf( (bproot+bs->v1)->pos, bp->pos);
 							VecSubf(sd,bp->pos,(bproot+bs->v1)->pos);
-							Normalize(sd);
+							actspringlen=Normalize(sd);
 							
 							/* friction stuff V2 */
 							VecSubf(velgoal,bp->vec,(bproot+bs->v1)->vec);