quite a load is still hidden behind the define #ifdef _work_on_sb_solver

a glance to view is the "STU PID semi implicit euler"
most of the work to implement a semi implicit euler was done ..
now i am dealing  with the tradeoffs between 'calculation time' which is quite expensive .. inverting a 0(n*n) sparse matrix /* once agian thanks to brecht for his work on making sparse matrices LU decomposition and evaluating inverses that easy*/  putting it into and cropping works pretty nice .. argh off topic again
...
while i spent a little time on reading recent papers i found :

1. control on springs needs to be split in pushing and pulling  /* fabric pushes easy but pulls hard */
2. diagonals on 4-gons (in the current SB model) can be seen as shear .. thus need a contol to modify .. this commit wil add it
3. 2 nd order springs /*aka rigidity */ can focus on bending .. thus renaming 'em
 
i have no idea how i would provide backward compatiblity, but the spots i marked in code :)

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_softbody.h b/source/blender/blenkernel/BKE_softbody.h
index 0f58b93730a..512ee67b36f 100644
--- a/source/blender/blenkernel/BKE_softbody.h
+++ b/source/blender/blenkernel/BKE_softbody.h
@@ -41,6 +41,7 @@ typedef struct BodyPoint {
 	float origS[3], origE[3], origT[3], pos[3], vec[3], force[3];
 	float goal;
 	float prevpos[3], prevvec[3], prevdx[3], prevdv[3]; /* used for Heun integration */
+    float impdv[3],impdx[3];
     int nofsprings; int *springs;
 	float choke;
 	float colball;