From aec47dec1b43faa9cd7ad12821d85882a79aa5a6 Mon Sep 17 00:00:00 2001
From: Samo Penic <samo.penic@fe.uni-lj.si>
Date: Wed, 29 Dec 2010 22:11:05 +0000
Subject: [PATCH] Prepared for bonflip and vertexmove.

---
 src/Makefile.am  |    4 
 src/bondflip.h   |    7 
 src/main.c       |    7 
 src/timestep.c   |  456 --------------------------
 configure.ac     |   28 +
 src/vertexmove.h |    3 
 src/bondflip.c   |  354 ++++++++++++++++++++
 src/cell.h       |    3 
 src/timestep.h   |   12 
 aclocal.m4       |    4 
 src/vertexmove.c |  105 ++++++
 11 files changed, 517 insertions(+), 466 deletions(-)

diff --git a/aclocal.m4 b/aclocal.m4
index e9b7b28..eba341b 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -13,8 +13,8 @@
 
 m4_ifndef([AC_AUTOCONF_VERSION],
   [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
-m4_if(m4_defn([AC_AUTOCONF_VERSION]), [2.65],,
-[m4_warning([this file was generated for autoconf 2.65.
+m4_if(m4_defn([AC_AUTOCONF_VERSION]), [2.67],,
+[m4_warning([this file was generated for autoconf 2.67.
 You have another version of autoconf.  It may work, but is not guaranteed to.
 If you have problems, you may need to regenerate the build system entirely.
 To do so, use the procedure documented by the package, typically `autoreconf'.])])
diff --git a/configure.ac b/configure.ac
index 2c4ec30..791a930 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,24 +1,44 @@
 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.
 
-AC_PREREQ([2.50])
+AC_PREREQ([2.67])
 AC_INIT([FULL-PACKAGE-NAME], [VERSION], [BUG-REPORT-ADDRESS])
-AM_INIT_AUTOMAKE
 AC_CONFIG_SRCDIR([config.h.in])
 AC_CONFIG_HEADERS([config.h])
-
+AM_INIT_AUTOMAKE
 # Checks for programs.
 AC_PROG_CC
 
 # Checks for libraries.
+# FIXME: Replace `main' with a function in `-lconfuse':
+AC_CHECK_LIB([confuse], [cfg_parse])
+# FIXME: Replace `main' with a function in `-lm':
+AC_CHECK_LIB([m], [pow])
 
 # Checks for header files.
-AC_CHECK_HEADERS([stdlib.h])
+AC_CHECK_HEADERS([stdlib.h string.h])
 
 # Checks for typedefs, structures, and compiler characteristics.
+AC_C_INLINE
+
+dnl Check if we have enable debug support.
+AC_MSG_CHECKING(whether to enable debugging)
+debug_default="yes"
+AC_ARG_ENABLE(debug, [ --enable-debug=[no/yes] turn on debugging
+[default=$debug_default]],, enable_debug=$debug_default)
+dnl Yes, shell scripts can be used
+if test "x$enable_debug" = "xyes"; then
+CFLAGS="-g -O2 -DDEBUG"
+AC_MSG_RESULT(yes)
+else
+CFLAGS="-O3 -ffast-math"
+AC_MSG_RESULT(no)
+fi
 
 # Checks for library functions.
 AC_FUNC_MALLOC
+AC_FUNC_REALLOC
+AC_CHECK_FUNCS([pow sqrt strndup])
 
 AC_CONFIG_FILES([Makefile
                  src/Makefile
diff --git a/src/Makefile.am b/src/Makefile.am
index e19ba39..25fc76f 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,5 +1,5 @@
 trisurfdir=../
-trisurf_PROGRAMS=trisurf
-trisurf_SOURCES=general.c vertex.c bond.c triangle.c cell.c vesicle.c initial_distribution.c io.c frame.c energy.c main.c
+trisurf_PROGRAMS = trisurf
+trisurf_SOURCES = general.c vertex.c bond.c triangle.c cell.c vesicle.c initial_distribution.c io.c frame.c energy.c timestep.c vertexmove.c main.c
 trisurf_LDFLAGS = -lm -lconfuse
 trisurf_CFLAGS = -Wall -Werror
diff --git a/src/bondflip.c b/src/bondflip.c
new file mode 100644
index 0000000..e56cc4e
--- /dev/null
+++ b/src/bondflip.c
@@ -0,0 +1,354 @@
+#include<stdlib.h>
+#include<math.h>
+#include "general.h"
+#include "vertex.h"
+#include "bond.h"
+#include "triangle.h"
+#include "vesicle.h"
+#include "energy.h"
+#include "timestep.h"
+#include "cell.h"
+//#include "io.h"
+#include<stdio.h>
+
+ts_bool single_bondflip_timestep(ts_vesicle *vesicle, ts_bond *bond, ts_double *rn){
+/*c  Vertex and triangle (lm and lp) indexing for bond flip:
+c      +----- k-------+              +----- k ------+
+c      |lm1 / | \ lp1 |              |lm1 /   \ lp1 |
+c      |  /   |   \   |              |  /       \   |
+c      |/     |     \ |     FLIP     |/    lm     \ |
+c     km  lm  | lp   kp    --->      km ---------- kp  
+c      |\     |     / |              |\    lp     / |  
+c      |  \   |   /   |              |  \       /   |
+c      |lm2 \ | / lp2 |              |lm2 \   / lp2 |
+c      +------it------+              +----- it -----+
+c
+*/
+    ts_vertex *it=bond->vtx1;
+    ts_vertex *k=bond->vtx2;
+    ts_uint nei,neip,neim;
+    ts_uint i,j;
+    ts_double oldenergy, delta_energy;
+ //   ts_triangle *lm=NULL,*lp=NULL, *lp1=NULL, *lp2=NULL, *lm1=NULL, *lm2=NULL;
+
+    ts_vertex *kp,*km;
+
+    if(it->neigh_no< 3) return TS_FAIL;
+    if(k->neigh_no< 3) return TS_FAIL;
+    if(k==NULL || it==NULL){
+        fatal("In bondflip, number of neighbours of k or it is less than 3!",999);
+    }
+
+
+    for(i=0;i<it->neigh_no;i++){ // Finds the nn of it, that is k 
+        if(it->neigh[i]==k){
+            nei=i;
+            break;
+        }
+    }
+    neip=nei+1;  // I don't like it.. Smells like I must have it in correct order
+    neim=nei-1;
+    if(neip>=it->neigh_no) neip=0;
+    if((ts_int)neim<0) neim=it->neigh_no-1; /* casting is essential... If not
+there the neim is never <0 !!! */
+  //  fprintf(stderr,"The numbers are: %u %u\n",neip, neim);
+    km=it->neigh[neim];  // We located km and kp
+    kp=it->neigh[neip];
+
+    if(km==NULL || kp==NULL){
+        fatal("In bondflip, cannot determine km and kp!",999);
+    }
+
+  //  fprintf(stderr,"I WAS HERE! after the 4 vertices are known!\n");
+
+/* test if the membrane is wrapped too much, so that kp is nearest neighbour of
+ * km. If it is true, then don't flip! */
+    for(i=0;i<km->neigh_no;i++){
+        if(km->neigh[i] == kp) return TS_FAIL;
+    }
+ //   fprintf(stderr,"Membrane didn't wrap too much.. Continue.\n");
+/* if bond would be too long, return... */
+    if(vertex_distance_sq(km,kp) > vesicle->dmax ) return TS_FAIL;
+ //   fprintf(stderr,"Bond will not be too long.. Continue.\n");
+
+/* we make a bond flip. this is different than in original fortran */
+// 0. step. Get memory prior the flip
+  oldenergy=0;
+  oldenergy+=k->xk* k->energy;
+  oldenergy+=kp->xk* kp->energy;
+  oldenergy+=km->xk* km->energy;
+  oldenergy+=it->xk* it->energy;
+//  for(i=0;i<k->neigh_no;i++) oldenergy+=k->neigh[i]->xk*k->neigh[i]->energy;
+//  for(i=0;i<kp->neigh_no;i++) oldenergy+=kp->neigh[i]->xk*kp->neigh[i]->energy;
+//  for(i=0;i<km->neigh_no;i++) oldenergy+=km->neigh[i]->xk*km->neigh[i]->energy;
+//  for(i=0;i<it->neigh_no;i++) oldenergy+=it->neigh[i]->xk*it->neigh[i]->energy;
+/*
+fprintf(stderr,"*** Naslov k=%d\n",k);
+fprintf(stderr,"*** Naslov it=%d\n",it);
+fprintf(stderr,"*** Naslov km=%d\n",km);
+fprintf(stderr,"*** Naslov kp=%d\n",kp);
+
+for(i=0;i<k->neigh_no;i++)
+    fprintf(stderr,"k sosed=%d\n",k->neigh[i]);
+for(i=0;i<it->neigh_no;i++)
+    fprintf(stderr,"it sosed=%d\n",it->neigh[i]);
+
+for(i=0;i<km->neigh_no;i++)
+    fprintf(stderr,"km sosed=%d\n",km->neigh[i]);
+for(i=0;i<kp->neigh_no;i++)
+    fprintf(stderr,"kp sosed=%d\n",kp->neigh[i]);
+
+
+*/
+  //  fprintf(stderr,"I WAS HERE! Before bondflip!\n");
+    ts_flip_bond(k,it,km,kp, bond);
+   // fprintf(stderr,"I WAS HERE! Bondflip successful!\n");
+
+/* Calculating the new energy */
+  delta_energy=0;
+  for(i=0;i<k->neigh_no;i++) energy_vertex(k->neigh[i]);
+  for(i=0;i<kp->neigh_no;i++) energy_vertex(kp->neigh[i]);
+  for(i=0;i<km->neigh_no;i++) energy_vertex(km->neigh[i]);
+  for(i=0;i<it->neigh_no;i++) energy_vertex(it->neigh[i]);
+  delta_energy+=k->xk* k->energy;
+  delta_energy+=kp->xk* kp->energy;
+  delta_energy+=km->xk* km->energy;
+  delta_energy+=it->xk* it->energy;
+//  for(i=0;i<k->neigh_no;i++) delta_energy+=k->neigh[i]->xk*k->neigh[i]->energy;
+//  for(i=0;i<kp->neigh_no;i++) delta_energy+=kp->neigh[i]->xk*kp->neigh[i]->energy;
+//  for(i=0;i<km->neigh_no;i++) delta_energy+=km->neigh[i]->xk*km->neigh[i]->energy;
+//  for(i=0;i<it->neigh_no;i++) delta_energy+=it->neigh[i]->xk*it->neigh[i]->energy;
+  delta_energy-=oldenergy;
+ // fprintf(stderr,"I WAS HERE! Got energy!\n");
+/* MONTE CARLO */
+    if(delta_energy>=0){
+#ifdef TS_DOUBLE_DOUBLE
+        if(exp(-delta_energy)< drand48() )
+#endif
+#ifdef TS_DOUBLE_FLOAT
+        if(expf(-delta_energy)< (ts_float)drand48())
+#endif
+#ifdef TS_DOUBLE_LONGDOUBLE
+        if(expl(-delta_energy)< (ts_ldouble)drand48())
+#endif
+        {
+            //not accepted, reverting changes
+       //     fprintf(stderr,"Failed to move, due to MC\n");
+
+//            ts_flip_bond(km,kp,it,k, bond);
+            ts_flip_bond(kp,km,k,it, bond);
+                
+
+/*
+fprintf(stderr,"*** Naslov k=%d\n",k);
+fprintf(stderr,"*** Naslov it=%d\n",it);
+fprintf(stderr,"*** Naslov km=%d\n",km);
+fprintf(stderr,"*** Naslov kp=%d\n",kp);
+for(i=0;i<k->neigh_no;i++)
+    fprintf(stderr,"k sosed=%d\n",k->neigh[i]);
+for(i=0;i<it->neigh_no;i++)
+    fprintf(stderr,"it sosed=%d\n",it->neigh[i]);
+
+
+for(i=0;i<km->neigh_no;i++)
+    fprintf(stderr,"km sosed=%d\n",km->neigh[i]);
+for(i=0;i<kp->neigh_no;i++)
+    fprintf(stderr,"kp sosed=%d\n",kp->neigh[i]);
+*/
+
+
+
+        //    fprintf(stderr,"Reverted condition!\n");
+            return TS_FAIL;
+        }
+    }
+        //    fprintf(stderr,"Success\n");
+
+
+/* IF BONDFLIP ACCEPTED, THEN RETURN SUCCESS! */
+    return TS_SUCCESS;
+}
+
+
+ts_bool ts_flip_bond(ts_vertex *k,ts_vertex *it,ts_vertex *km, ts_vertex *kp,
+ts_bond *bond){
+
+    ts_triangle *lm=NULL,*lp=NULL, *lp1=NULL, *lm2=NULL;
+    ts_uint i,j, lmidx, lpidx;
+if(k==NULL || it==NULL || km==NULL || kp==NULL){
+    fatal("ts_flip_bond: You called me with invalid pointers to vertices",999);
+}
+// 1. step. We find lm and lp from k->tristar !
+    for(i=0;i<it->tristar_no;i++){
+        for(j=0;j<k->tristar_no;j++){
+            if((it->tristar[i] == k->tristar[j])){ //ce gre za skupen trikotnik
+                if((it->tristar[i]->vertex[0] == km || it->tristar[i]->vertex[1]
+== km || it->tristar[i]->vertex[2]== km )){
+                lm=it->tristar[i];
+         //       lmidx=i;
+                }
+                else
+                {
+                lp=it->tristar[i];
+         //       lpidx=i;
+                }
+
+            }
+        }
+    }
+if(lm==NULL || lp==NULL) fatal("ts_flip_bond: Cannot find triangles lm and lp!",999);
+
+//we look for important triangles lp1 and lm2.
+
+ for(i=0;i<k->tristar_no;i++){
+        for(j=0;j<kp->tristar_no;j++){
+                if((k->tristar[i] == kp->tristar[j]) && k->tristar[i]!=lp){ //ce gre za skupen trikotnik
+                    lp1=k->tristar[i];
+            }
+        }
+}
+
+ for(i=0;i<it->tristar_no;i++){
+        for(j=0;j<km->tristar_no;j++){
+            if((it->tristar[i] == km->tristar[j]) && it->tristar[i]!=lm){ //ce gre za skupen trikotnik
+                    lm2=it->tristar[i];
+            } 
+        }
+    }
+/*
+// DEBUG TESTING!
+fprintf(stderr,"*** Naslov k=%d\n",k);
+fprintf(stderr,"*** Naslov it=%d\n",it);
+fprintf(stderr,"*** Naslov km=%d\n",km);
+fprintf(stderr,"*** Naslov kp=%d\n",kp);
+
+for(i=0;i<k->neigh_no;i++)
+    fprintf(stderr,"k sosed=%d\n",k->neigh[i]);
+for(i=0;i<it->neigh_no;i++)
+    fprintf(stderr,"it sosed=%d\n",it->neigh[i]);
+
+
+// END DEBUG TESTING!
+*/
+if(lm2==NULL || lp1==NULL) fatal("ts_flip_bond: Cannot find triangles lm2 and lp1!",999);
+
+
+//fprintf(stderr,"1. step: lm, lm2, lp1 and lp found!\n");
+
+/*
+//DEBUG TESTING
+fprintf(stderr,"--- Naslov lm=%d",lm);
+
+
+fprintf(stderr,"   vtxs(%d, %d, %d)\n",lm->vertex[0],lm->vertex[1], lm->vertex[2]);
+fprintf(stderr,"--- Naslov lp=%d",lp);
+fprintf(stderr,"   vtxs(%d, %d, %d)\n",lp->vertex[0],lp->vertex[1], lp->vertex[2]);
+fprintf(stderr,"--- Naslov lm2=%d",lm2);
+fprintf(stderr,"   vtxs(%d, %d, %d)\n",lm2->vertex[0],lm2->vertex[1], lm2->vertex[2]);
+fprintf(stderr,"--- Naslov lp1=%d",lp1);
+fprintf(stderr,"   vtxs(%d, %d, %d)\n",lp1->vertex[0],lp1->vertex[1], lp1->vertex[2]);
+
+for(i=0;i<lm->neigh_no;i++)
+    fprintf(stderr,"lm sosed=%d\n",lm->neigh[i]);
+for(i=0;i<lp->neigh_no;i++)
+    fprintf(stderr,"lp sosed=%d\n",lp->neigh[i]);
+// END DEBUG TESTING
+*/
+/*
+// DEBUG TESTING!
+
+for(i=0;i<3;i++){
+
+    if(lp1->neigh[i]==lp) fprintf(stderr,"Nasel sem par lp1->lp\n");
+    if(lp->neigh[i]==lp1) fprintf(stderr,"Nasel sem par lp->lp1\n");
+    if(lm2->neigh[i]==lm) fprintf(stderr,"Nasel sem par lm2->lm\n");
+    if(lm->neigh[i]==lm2) fprintf(stderr,"Nasel sem par lm->lm2\n");
+}
+// END DEBUG TESTING!
+*/
+
+
+// 2. step. We change the triangle vertices... (actual bond flip)
+    for(i=0;i<3;i++) if(lm->vertex[i]== it) lm->vertex[i]= kp;
+    for(i=0;i<3;i++) if(lp->vertex[i]== k) lp->vertex[i]= km;
+//fprintf(stderr,"2. step: actual bondflip made\n");
+// 2a. step. If any changes in triangle calculations must be done, do it here!
+//   * normals are recalculated here
+    triangle_normal_vector(lp);
+    triangle_normal_vector(lm);
+// 3. step. Correct neighbours in vertex_list
+
+
+            vertex_remove_neighbour(k,it);
+            vertex_remove_neighbour(it,k);
+            //Tukaj pa nastopi tezava... Kam dodati soseda?
+            vertex_insert_neighbour(km,kp,k);
+            vertex_insert_neighbour(kp,km,it);
+//            vertex_add_neighbour(km,kp); //pazi na vrstni red.
+//            vertex_add_neighbour(kp,km);
+//fprintf(stderr,"3. step: vertex neighbours corrected\n");
+
+// 3a. step. If any changes to ts_vertex, do it here!
+//   bond_length calculatons not required for it is done in energy.c
+
+// 4. step. Correct bond_list (don't know why I still have it!)
+            bond->vtx1=km;
+            bond->vtx2=kp;
+//fprintf(stderr,"4. step: bondlist corrected\n");
+
+
+// 5. step. Correct neighbouring triangles 
+   
+    triangle_remove_neighbour(lp,lp1);
+   // fprintf(stderr,".\n");
+    triangle_remove_neighbour(lp1,lp);
+  //  fprintf(stderr,".\n");
+    triangle_remove_neighbour(lm,lm2);
+  //  fprintf(stderr,".\n");
+    triangle_remove_neighbour(lm2,lm);
+   
+    triangle_add_neighbour(lm,lp1);    
+    triangle_add_neighbour(lp1,lm);
+    triangle_add_neighbour(lp,lm2);  //Vrstni red?!
+    triangle_add_neighbour(lm2,lp);
+
+//fprintf(stderr,"5. step: triangle neigbours corrected\n");
+
+
+// 6. step. Correct tristar for vertices km, kp, k and it
+            vertex_add_tristar(km,lp);  // Preveri vrstni red!
+            vertex_add_tristar(kp,lm);
+            vertex_remove_tristar(it,lm);
+            vertex_remove_tristar(k,lp);
+//fprintf(stderr,"6. step: tristar corrected\n");
+
+/*
+//DEBUG TESTING
+fprintf(stderr,"--- Naslov lm=%d",lm);
+
+
+fprintf(stderr,"   vtxs(%d, %d, %d)\n",lm->vertex[0],lm->vertex[1], lm->vertex[2]);
+fprintf(stderr,"--- Naslov lp=%d",lp);
+fprintf(stderr,"   vtxs(%d, %d, %d)\n",lp->vertex[0],lp->vertex[1], lp->vertex[2]);
+fprintf(stderr,"--- Naslov lm2=%d",lm2);
+fprintf(stderr,"   vtxs(%d, %d, %d)\n",lm2->vertex[0],lm2->vertex[1], lm2->vertex[2]);
+fprintf(stderr,"--- Naslov lp1=%d",lp1);
+fprintf(stderr,"   vtxs(%d, %d, %d)\n",lp1->vertex[0],lp1->vertex[1], lp1->vertex[2]);
+
+for(i=0;i<lm->neigh_no;i++)
+    fprintf(stderr,"lm sosed=%d\n",lm->neigh[i]);
+for(i=0;i<lp->neigh_no;i++)
+    fprintf(stderr,"lp sosed=%d\n",lp->neigh[i]);
+// END DEBUG TESTING
+*/
+  energy_vertex(k);
+  energy_vertex(kp);
+  energy_vertex(km);
+  energy_vertex(it);
+
+
+// END modifications to data structure!
+
+
+    return TS_SUCCESS;
+}
diff --git a/src/bondflip.h b/src/bondflip.h
new file mode 100644
index 0000000..6713c31
--- /dev/null
+++ b/src/bondflip.h
@@ -0,0 +1,7 @@
+#ifdef _H_BONDFLIP
+#define _H_BONDFLIP
+
+ts_bool single_bondflip_timestep(ts_vesicle *vesicle, ts_bond *bond, ts_double *rn);
+
+ts_bool ts_flip_bond(ts_vertex *k,ts_vertex *it,ts_vertex *km, ts_vertex *kp, ts_bond *bond);
+#endif
diff --git a/src/cell.h b/src/cell.h
index 660792b..76ba105 100644
--- a/src/cell.h
+++ b/src/cell.h
@@ -7,6 +7,5 @@
 ts_bool cell_add_vertex(ts_cell *cell, ts_vertex *vtx);
 ts_bool cell_list_cell_occupation_clear(ts_cell_list *clist);
 
-//ts_bool cell_occupation_number_and_internal_proximity(ts_cell_list *clist,
-//ts_uint cellidx, ts_vertex *vtx, ts_vertex *tvtx);
+ts_bool cell_occupation_number_and_internal_proximity(ts_cell_list *clist, ts_uint cellidx, ts_vertex *vtx, ts_vertex *tvtx);
 #endif
diff --git a/src/main.c b/src/main.c
index 96473ba..e4e1027 100644
--- a/src/main.c
+++ b/src/main.c
@@ -9,6 +9,7 @@
 #include "io.h"
 #include "initial_distribution.h"
 #include "frame.h"
+#include "timestep.h"
 
 /** Entrance function to the program
   * @param argv is a number of parameters used in program call (including the program name
@@ -18,6 +19,7 @@
 
 int main(int argv, char *argc[]){
 ts_bool retval;
+ts_uint i;
     ts_vertex_list *vlist=init_vertex_list(5);
 ts_vertex_list *vlist1;
 ts_bond_list *blist=init_bond_list();
@@ -63,6 +65,11 @@
 centermass(vesicle);
 cell_occupation(vesicle);
 
+for(i=0;i<100;i++)
+single_timestep(vesicle);
+
+
+
 write_vertex_xml_file(vesicle,0);
 write_master_xml_file("test.pvd");
 write_dout_fcompat_file(vesicle,"dout");
diff --git a/src/timestep.c b/src/timestep.c
index 5d4a447..829faec 100644
--- a/src/timestep.c
+++ b/src/timestep.c
@@ -1,34 +1,29 @@
 #include<stdlib.h>
-#include<math.h>
-#include "general.h"
-#include "vertex.h"
-#include "bond.h"
-#include "triangle.h"
-#include "vesicle.h"
-#include "energy.h"
-#include "timestep.h"
-#include "cell.h"
-//#include "io.h"
 #include<stdio.h>
+#include<math.h>
+//#include "io.h"
+#include "general.h"
+#include "timestep.h"
+#include "vertexmove.h"
 
 ts_bool single_timestep(ts_vesicle *vesicle){
     ts_bool retval;
     ts_double rnvec[3];
     ts_uint i;
-    for(i=0;i<vesicle->vlist.n;i++){
+    for(i=0;i<vesicle->vlist->n;i++){
         rnvec[0]=drand48();
         rnvec[1]=drand48();
         rnvec[2]=drand48();
-        retval=single_verticle_timestep(vesicle,&vesicle->vlist.vertex[i],rnvec);
+        retval=single_verticle_timestep(vesicle,vesicle->vlist->vtx[i],rnvec);
     }
 
-    for(i=0;i<vesicle->blist.n;i++){
+    for(i=0;i<vesicle->blist->n;i++){
         rnvec[0]=drand48();
         rnvec[1]=drand48();
         rnvec[2]=drand48();
         //find a bond and return a pointer to a bond...
         //call single_bondflip_timestep...
-        retval=single_bondflip_timestep(vesicle,&vesicle->blist.bond[i],rnvec);
+//        retval=single_bondflip_timestep(vesicle,&vesicle->blist.bond[i],rnvec);
         
     } 
 
@@ -37,436 +32,3 @@
 
 
 
-
-
-ts_bool single_verticle_timestep(ts_vesicle *vesicle,ts_vertex *vtx,ts_double
-*rn){
-    ts_uint i;
-    ts_double dist;
-    ts_vertex tvtx;
-    ts_bool retval; 
-    ts_uint cellidx; 
-    ts_double xold,yold,zold;
-    ts_double delta_energy,oenergy;
-    ts_vertex *ovtx;
-
-    //randomly we move the temporary vertex
-    tvtx.x=vtx->x+vesicle->stepsize*(2.0*rn[0]-1.0);
-    tvtx.y=vtx->y+vesicle->stepsize*(2.0*rn[1]-1.0);
-    tvtx.z=vtx->z+vesicle->stepsize*(2.0*rn[2]-1.0);
-    //check we if some length to neighbours are too much
-
-    for(i=0;i<vtx->neigh_no;i++){
-        dist=vertex_distance_sq(&tvtx,vtx->neigh[i]);
-        if(dist<1.0 || dist>vesicle->dmax) return TS_FAIL;
-    }
-    //self avoidance check with distant vertices
-     cellidx=vertex_self_avoidance(vesicle, &tvtx);
-    //check occupation number
-     retval=cell_occupation_number_and_internal_proximity(&vesicle->clist,cellidx,vtx,&tvtx);
-    if(retval==TS_FAIL){
-        return TS_FAIL;
-    }
-    
-    //if all the tests are successful, then we update the vertex position
-    xold=vtx->x;
-    yold=vtx->y;
-    zold=vtx->z;
-    ovtx=malloc(sizeof(ts_vertex));
-    vertex_full_copy(ovtx,vtx);
-    vtx->x=tvtx.x;
-    vtx->y=tvtx.y;
-    vtx->z=tvtx.z;
-
-    delta_energy=0;
-    //update the normals of triangles that share bead i.
-    for(i=0;i<vtx->tristar_no;i++) triangle_normal_vector(vtx->tristar[i]);
-    //energy and curvature
-    energy_vertex(vtx);
-    delta_energy=vtx->xk*(vtx->energy - ovtx->energy);
-    //the same is done for neighbouring vertices
-    for(i=0;i<vtx->neigh_no;i++){
-        oenergy=vtx->neigh[i]->energy;
-        energy_vertex(vtx->neigh[i]);
-        delta_energy+=vtx->neigh[i]->xk*(vtx->neigh[i]->energy-oenergy);
-    }
-  //  fprintf(stderr, "DE=%f\n",delta_energy);
-    //MONTE CARLOOOOOOOO
-    if(delta_energy>=0){
-#ifdef TS_DOUBLE_DOUBLE
-        if(exp(-delta_energy)< drand48() )
-#endif
-#ifdef TS_DOUBLE_FLOAT
-        if(expf(-delta_energy)< (ts_float)drand48())
-#endif
-#ifdef TS_DOUBLE_LONGDOUBLE
-        if(expl(-delta_energy)< (ts_ldouble)drand48())
-#endif
-    {
-    //not accepted, reverting changes
-    vtx->x=xold;
-    vtx->y=yold;
-    vtx->z=zold;
-    //update the normals of triangles that share bead i.
-    for(i=0;i<vtx->tristar_no;i++) triangle_normal_vector(vtx->tristar[i]);
-    //energy and curvature
-    energy_vertex(vtx);
-    //the same is done for neighbouring vertices
-    for(i=0;i<vtx->neigh_no;i++) energy_vertex(vtx->neigh[i]);
-  free(ovtx->bond_length);
-    free(ovtx->bond_length_dual);
-    free(ovtx);
-    return TS_FAIL; 
-    }
-}
-    //END MONTE CARLOOOOOOO
-
-    //TODO: change cell occupation if necessary!
-
-    free(ovtx->bond_length);
-    free(ovtx->bond_length_dual);
-    free(ovtx);
-    return TS_SUCCESS;
-}
-
-ts_bool single_bondflip_timestep(ts_vesicle *vesicle, ts_bond *bond, ts_double *rn){
-/*c  Vertex and triangle (lm and lp) indexing for bond flip:
-c      +----- k-------+              +----- k ------+
-c      |lm1 / | \ lp1 |              |lm1 /   \ lp1 |
-c      |  /   |   \   |              |  /       \   |
-c      |/     |     \ |     FLIP     |/    lm     \ |
-c     km  lm  | lp   kp    --->      km ---------- kp  
-c      |\     |     / |              |\    lp     / |  
-c      |  \   |   /   |              |  \       /   |
-c      |lm2 \ | / lp2 |              |lm2 \   / lp2 |
-c      +------it------+              +----- it -----+
-c
-*/
-    ts_vertex *it=bond->vtx1;
-    ts_vertex *k=bond->vtx2;
-    ts_uint nei,neip,neim;
-    ts_uint i,j;
-    ts_double oldenergy, delta_energy;
- //   ts_triangle *lm=NULL,*lp=NULL, *lp1=NULL, *lp2=NULL, *lm1=NULL, *lm2=NULL;
-
-    ts_vertex *kp,*km;
-
-    if(it->neigh_no< 3) return TS_FAIL;
-    if(k->neigh_no< 3) return TS_FAIL;
-    if(k==NULL || it==NULL){
-        fatal("In bondflip, number of neighbours of k or it is less than 3!",999);
-    }
-
-
-    for(i=0;i<it->neigh_no;i++){ // Finds the nn of it, that is k 
-        if(it->neigh[i]==k){
-            nei=i;
-            break;
-        }
-    }
-    neip=nei+1;  // I don't like it.. Smells like I must have it in correct order
-    neim=nei-1;
-    if(neip>=it->neigh_no) neip=0;
-    if((ts_int)neim<0) neim=it->neigh_no-1; /* casting is essential... If not
-there the neim is never <0 !!! */
-  //  fprintf(stderr,"The numbers are: %u %u\n",neip, neim);
-    km=it->neigh[neim];  // We located km and kp
-    kp=it->neigh[neip];
-
-    if(km==NULL || kp==NULL){
-        fatal("In bondflip, cannot determine km and kp!",999);
-    }
-
-  //  fprintf(stderr,"I WAS HERE! after the 4 vertices are known!\n");
-
-/* test if the membrane is wrapped too much, so that kp is nearest neighbour of
- * km. If it is true, then don't flip! */
-    for(i=0;i<km->neigh_no;i++){
-        if(km->neigh[i] == kp) return TS_FAIL;
-    }
- //   fprintf(stderr,"Membrane didn't wrap too much.. Continue.\n");
-/* if bond would be too long, return... */
-    if(vertex_distance_sq(km,kp) > vesicle->dmax ) return TS_FAIL;
- //   fprintf(stderr,"Bond will not be too long.. Continue.\n");
-
-/* we make a bond flip. this is different than in original fortran */
-// 0. step. Get memory prior the flip
-  oldenergy=0;
-  oldenergy+=k->xk* k->energy;
-  oldenergy+=kp->xk* kp->energy;
-  oldenergy+=km->xk* km->energy;
-  oldenergy+=it->xk* it->energy;
-//  for(i=0;i<k->neigh_no;i++) oldenergy+=k->neigh[i]->xk*k->neigh[i]->energy;
-//  for(i=0;i<kp->neigh_no;i++) oldenergy+=kp->neigh[i]->xk*kp->neigh[i]->energy;
-//  for(i=0;i<km->neigh_no;i++) oldenergy+=km->neigh[i]->xk*km->neigh[i]->energy;
-//  for(i=0;i<it->neigh_no;i++) oldenergy+=it->neigh[i]->xk*it->neigh[i]->energy;
-/*
-fprintf(stderr,"*** Naslov k=%d\n",k);
-fprintf(stderr,"*** Naslov it=%d\n",it);
-fprintf(stderr,"*** Naslov km=%d\n",km);
-fprintf(stderr,"*** Naslov kp=%d\n",kp);
-
-for(i=0;i<k->neigh_no;i++)
-    fprintf(stderr,"k sosed=%d\n",k->neigh[i]);
-for(i=0;i<it->neigh_no;i++)
-    fprintf(stderr,"it sosed=%d\n",it->neigh[i]);
-
-for(i=0;i<km->neigh_no;i++)
-    fprintf(stderr,"km sosed=%d\n",km->neigh[i]);
-for(i=0;i<kp->neigh_no;i++)
-    fprintf(stderr,"kp sosed=%d\n",kp->neigh[i]);
-
-
-*/
-  //  fprintf(stderr,"I WAS HERE! Before bondflip!\n");
-    ts_flip_bond(k,it,km,kp, bond);
-   // fprintf(stderr,"I WAS HERE! Bondflip successful!\n");
-
-/* Calculating the new energy */
-  delta_energy=0;
-  for(i=0;i<k->neigh_no;i++) energy_vertex(k->neigh[i]);
-  for(i=0;i<kp->neigh_no;i++) energy_vertex(kp->neigh[i]);
-  for(i=0;i<km->neigh_no;i++) energy_vertex(km->neigh[i]);
-  for(i=0;i<it->neigh_no;i++) energy_vertex(it->neigh[i]);
-  delta_energy+=k->xk* k->energy;
-  delta_energy+=kp->xk* kp->energy;
-  delta_energy+=km->xk* km->energy;
-  delta_energy+=it->xk* it->energy;
-//  for(i=0;i<k->neigh_no;i++) delta_energy+=k->neigh[i]->xk*k->neigh[i]->energy;
-//  for(i=0;i<kp->neigh_no;i++) delta_energy+=kp->neigh[i]->xk*kp->neigh[i]->energy;
-//  for(i=0;i<km->neigh_no;i++) delta_energy+=km->neigh[i]->xk*km->neigh[i]->energy;
-//  for(i=0;i<it->neigh_no;i++) delta_energy+=it->neigh[i]->xk*it->neigh[i]->energy;
-  delta_energy-=oldenergy;
- // fprintf(stderr,"I WAS HERE! Got energy!\n");
-/* MONTE CARLO */
-    if(delta_energy>=0){
-#ifdef TS_DOUBLE_DOUBLE
-        if(exp(-delta_energy)< drand48() )
-#endif
-#ifdef TS_DOUBLE_FLOAT
-        if(expf(-delta_energy)< (ts_float)drand48())
-#endif
-#ifdef TS_DOUBLE_LONGDOUBLE
-        if(expl(-delta_energy)< (ts_ldouble)drand48())
-#endif
-        {
-            //not accepted, reverting changes
-       //     fprintf(stderr,"Failed to move, due to MC\n");
-
-//            ts_flip_bond(km,kp,it,k, bond);
-            ts_flip_bond(kp,km,k,it, bond);
-                
-
-/*
-fprintf(stderr,"*** Naslov k=%d\n",k);
-fprintf(stderr,"*** Naslov it=%d\n",it);
-fprintf(stderr,"*** Naslov km=%d\n",km);
-fprintf(stderr,"*** Naslov kp=%d\n",kp);
-for(i=0;i<k->neigh_no;i++)
-    fprintf(stderr,"k sosed=%d\n",k->neigh[i]);
-for(i=0;i<it->neigh_no;i++)
-    fprintf(stderr,"it sosed=%d\n",it->neigh[i]);
-
-
-for(i=0;i<km->neigh_no;i++)
-    fprintf(stderr,"km sosed=%d\n",km->neigh[i]);
-for(i=0;i<kp->neigh_no;i++)
-    fprintf(stderr,"kp sosed=%d\n",kp->neigh[i]);
-*/
-
-
-
-        //    fprintf(stderr,"Reverted condition!\n");
-            return TS_FAIL;
-        }
-    }
-        //    fprintf(stderr,"Success\n");
-
-
-/* IF BONDFLIP ACCEPTED, THEN RETURN SUCCESS! */
-    return TS_SUCCESS;
-}
-
-
-ts_bool ts_flip_bond(ts_vertex *k,ts_vertex *it,ts_vertex *km, ts_vertex *kp,
-ts_bond *bond){
-
-    ts_triangle *lm=NULL,*lp=NULL, *lp1=NULL, *lm2=NULL;
-    ts_uint i,j, lmidx, lpidx;
-if(k==NULL || it==NULL || km==NULL || kp==NULL){
-    fatal("ts_flip_bond: You called me with invalid pointers to vertices",999);
-}
-// 1. step. We find lm and lp from k->tristar !
-    for(i=0;i<it->tristar_no;i++){
-        for(j=0;j<k->tristar_no;j++){
-            if((it->tristar[i] == k->tristar[j])){ //ce gre za skupen trikotnik
-                if((it->tristar[i]->vertex[0] == km || it->tristar[i]->vertex[1]
-== km || it->tristar[i]->vertex[2]== km )){
-                lm=it->tristar[i];
-         //       lmidx=i;
-                }
-                else
-                {
-                lp=it->tristar[i];
-         //       lpidx=i;
-                }
-
-            }
-        }
-    }
-if(lm==NULL || lp==NULL) fatal("ts_flip_bond: Cannot find triangles lm and lp!",999);
-
-//we look for important triangles lp1 and lm2.
-
- for(i=0;i<k->tristar_no;i++){
-        for(j=0;j<kp->tristar_no;j++){
-                if((k->tristar[i] == kp->tristar[j]) && k->tristar[i]!=lp){ //ce gre za skupen trikotnik
-                    lp1=k->tristar[i];
-            }
-        }
-}
-
- for(i=0;i<it->tristar_no;i++){
-        for(j=0;j<km->tristar_no;j++){
-            if((it->tristar[i] == km->tristar[j]) && it->tristar[i]!=lm){ //ce gre za skupen trikotnik
-                    lm2=it->tristar[i];
-            } 
-        }
-    }
-/*
-// DEBUG TESTING!
-fprintf(stderr,"*** Naslov k=%d\n",k);
-fprintf(stderr,"*** Naslov it=%d\n",it);
-fprintf(stderr,"*** Naslov km=%d\n",km);
-fprintf(stderr,"*** Naslov kp=%d\n",kp);
-
-for(i=0;i<k->neigh_no;i++)
-    fprintf(stderr,"k sosed=%d\n",k->neigh[i]);
-for(i=0;i<it->neigh_no;i++)
-    fprintf(stderr,"it sosed=%d\n",it->neigh[i]);
-
-
-// END DEBUG TESTING!
-*/
-if(lm2==NULL || lp1==NULL) fatal("ts_flip_bond: Cannot find triangles lm2 and lp1!",999);
-
-
-//fprintf(stderr,"1. step: lm, lm2, lp1 and lp found!\n");
-
-/*
-//DEBUG TESTING
-fprintf(stderr,"--- Naslov lm=%d",lm);
-
-
-fprintf(stderr,"   vtxs(%d, %d, %d)\n",lm->vertex[0],lm->vertex[1], lm->vertex[2]);
-fprintf(stderr,"--- Naslov lp=%d",lp);
-fprintf(stderr,"   vtxs(%d, %d, %d)\n",lp->vertex[0],lp->vertex[1], lp->vertex[2]);
-fprintf(stderr,"--- Naslov lm2=%d",lm2);
-fprintf(stderr,"   vtxs(%d, %d, %d)\n",lm2->vertex[0],lm2->vertex[1], lm2->vertex[2]);
-fprintf(stderr,"--- Naslov lp1=%d",lp1);
-fprintf(stderr,"   vtxs(%d, %d, %d)\n",lp1->vertex[0],lp1->vertex[1], lp1->vertex[2]);
-
-for(i=0;i<lm->neigh_no;i++)
-    fprintf(stderr,"lm sosed=%d\n",lm->neigh[i]);
-for(i=0;i<lp->neigh_no;i++)
-    fprintf(stderr,"lp sosed=%d\n",lp->neigh[i]);
-// END DEBUG TESTING
-*/
-/*
-// DEBUG TESTING!
-
-for(i=0;i<3;i++){
-
-    if(lp1->neigh[i]==lp) fprintf(stderr,"Nasel sem par lp1->lp\n");
-    if(lp->neigh[i]==lp1) fprintf(stderr,"Nasel sem par lp->lp1\n");
-    if(lm2->neigh[i]==lm) fprintf(stderr,"Nasel sem par lm2->lm\n");
-    if(lm->neigh[i]==lm2) fprintf(stderr,"Nasel sem par lm->lm2\n");
-}
-// END DEBUG TESTING!
-*/
-
-
-// 2. step. We change the triangle vertices... (actual bond flip)
-    for(i=0;i<3;i++) if(lm->vertex[i]== it) lm->vertex[i]= kp;
-    for(i=0;i<3;i++) if(lp->vertex[i]== k) lp->vertex[i]= km;
-//fprintf(stderr,"2. step: actual bondflip made\n");
-// 2a. step. If any changes in triangle calculations must be done, do it here!
-//   * normals are recalculated here
-    triangle_normal_vector(lp);
-    triangle_normal_vector(lm);
-// 3. step. Correct neighbours in vertex_list
-
-
-            vertex_remove_neighbour(k,it);
-            vertex_remove_neighbour(it,k);
-            //Tukaj pa nastopi tezava... Kam dodati soseda?
-            vertex_insert_neighbour(km,kp,k);
-            vertex_insert_neighbour(kp,km,it);
-//            vertex_add_neighbour(km,kp); //pazi na vrstni red.
-//            vertex_add_neighbour(kp,km);
-//fprintf(stderr,"3. step: vertex neighbours corrected\n");
-
-// 3a. step. If any changes to ts_vertex, do it here!
-//   bond_length calculatons not required for it is done in energy.c
-
-// 4. step. Correct bond_list (don't know why I still have it!)
-            bond->vtx1=km;
-            bond->vtx2=kp;
-//fprintf(stderr,"4. step: bondlist corrected\n");
-
-
-// 5. step. Correct neighbouring triangles 
-   
-    triangle_remove_neighbour(lp,lp1);
-   // fprintf(stderr,".\n");
-    triangle_remove_neighbour(lp1,lp);
-  //  fprintf(stderr,".\n");
-    triangle_remove_neighbour(lm,lm2);
-  //  fprintf(stderr,".\n");
-    triangle_remove_neighbour(lm2,lm);
-   
-    triangle_add_neighbour(lm,lp1);    
-    triangle_add_neighbour(lp1,lm);
-    triangle_add_neighbour(lp,lm2);  //Vrstni red?!
-    triangle_add_neighbour(lm2,lp);
-
-//fprintf(stderr,"5. step: triangle neigbours corrected\n");
-
-
-// 6. step. Correct tristar for vertices km, kp, k and it
-            vertex_add_tristar(km,lp);  // Preveri vrstni red!
-            vertex_add_tristar(kp,lm);
-            vertex_remove_tristar(it,lm);
-            vertex_remove_tristar(k,lp);
-//fprintf(stderr,"6. step: tristar corrected\n");
-
-/*
-//DEBUG TESTING
-fprintf(stderr,"--- Naslov lm=%d",lm);
-
-
-fprintf(stderr,"   vtxs(%d, %d, %d)\n",lm->vertex[0],lm->vertex[1], lm->vertex[2]);
-fprintf(stderr,"--- Naslov lp=%d",lp);
-fprintf(stderr,"   vtxs(%d, %d, %d)\n",lp->vertex[0],lp->vertex[1], lp->vertex[2]);
-fprintf(stderr,"--- Naslov lm2=%d",lm2);
-fprintf(stderr,"   vtxs(%d, %d, %d)\n",lm2->vertex[0],lm2->vertex[1], lm2->vertex[2]);
-fprintf(stderr,"--- Naslov lp1=%d",lp1);
-fprintf(stderr,"   vtxs(%d, %d, %d)\n",lp1->vertex[0],lp1->vertex[1], lp1->vertex[2]);
-
-for(i=0;i<lm->neigh_no;i++)
-    fprintf(stderr,"lm sosed=%d\n",lm->neigh[i]);
-for(i=0;i<lp->neigh_no;i++)
-    fprintf(stderr,"lp sosed=%d\n",lp->neigh[i]);
-// END DEBUG TESTING
-*/
-  energy_vertex(k);
-  energy_vertex(kp);
-  energy_vertex(km);
-  energy_vertex(it);
-
-
-// END modifications to data structure!
-
-
-    return TS_SUCCESS;
-}
diff --git a/src/timestep.h b/src/timestep.h
index 53c5ed1..c4015ae 100644
--- a/src/timestep.h
+++ b/src/timestep.h
@@ -1,10 +1,4 @@
+#ifndef _TIMESTEP_H
+#define _TIMESTEP_H
 ts_bool single_timestep(ts_vesicle *vesicle);
-
-ts_bool single_verticle_timestep(ts_vesicle *vesicle,ts_vertex *vtx,ts_double
-*rn);
-
-ts_bool single_bondflip_timestep(ts_vesicle *vesicle, ts_bond *bond, ts_double
-*rn);
-
-ts_bool ts_flip_bond(ts_vertex *k,ts_vertex *it,ts_vertex *km, ts_vertex *kp,
-ts_bond *bond);
+#endif
diff --git a/src/vertexmove.c b/src/vertexmove.c
new file mode 100644
index 0000000..243463f
--- /dev/null
+++ b/src/vertexmove.c
@@ -0,0 +1,105 @@
+#include<stdlib.h>
+#include<math.h>
+#include "general.h"
+#include "vertex.h"
+#include "bond.h"
+#include "triangle.h"
+#include "vesicle.h"
+#include "energy.h"
+#include "timestep.h"
+#include "cell.h"
+//#include "io.h"
+#include<stdio.h>
+#include "vertexmove.h"
+
+ts_bool single_verticle_timestep(ts_vesicle *vesicle,ts_vertex *vtx,ts_double
+*rn){
+    ts_uint i;
+    ts_double dist;
+    ts_vertex *tvtx=(ts_vertex *)malloc(sizeof(ts_vertex));
+	tvtx->data=init_vertex_data();
+    ts_bool retval; 
+    ts_uint cellidx; 
+    ts_double xold,yold,zold;
+    ts_double delta_energy,oenergy;
+    ts_vertex *ovtx;
+
+    //randomly we move the temporary vertex
+    tvtx->data->x=vtx->data->x+vesicle->stepsize*(2.0*rn[0]-1.0);
+    tvtx->data->y=vtx->data->y+vesicle->stepsize*(2.0*rn[1]-1.0);
+    tvtx->data->z=vtx->data->z+vesicle->stepsize*(2.0*rn[2]-1.0);
+    //check we if some length to neighbours are too much
+    for(i=0;i<vtx->data->neigh_no;i++){
+        dist=vtx_distance_sq(tvtx,vtx->data->neigh[i]);
+        if(dist<1.0 || dist>vesicle->dmax) return TS_FAIL;
+    }
+fprintf(stderr,"Was here!\n");
+    //self avoidance check with distant vertices
+     cellidx=vertex_self_avoidance(vesicle, tvtx);
+    //check occupation number
+     retval=cell_occupation_number_and_internal_proximity(vesicle->clist,cellidx,vtx,tvtx);
+    if(retval==TS_FAIL){
+        return TS_FAIL;
+    } 
+    
+    //if all the tests are successful, then we update the vertex position
+    xold=vtx->data->x;
+    yold=vtx->data->y;
+    zold=vtx->data->z;
+    ovtx=malloc(sizeof(ts_vertex));
+    vtx_copy(ovtx,vtx);
+    vtx->data->x=tvtx->data->x;
+    vtx->data->y=tvtx->data->y;
+    vtx->data->z=tvtx->data->z;
+
+    delta_energy=0;
+    //update the normals of triangles that share bead i.
+    for(i=0;i<vtx->data->tristar_no;i++) triangle_normal_vector(vtx->data->tristar[i]);
+    //energy and curvature
+    energy_vertex(vtx);
+    delta_energy=vtx->data->xk*(vtx->data->energy - ovtx->data->energy);
+    //the same is done for neighbouring vertices
+    for(i=0;i<vtx->data->neigh_no;i++){
+        oenergy=vtx->data->neigh[i]->data->energy;
+        energy_vertex(vtx->data->neigh[i]);
+        delta_energy+=vtx->data->neigh[i]->data->xk*(vtx->data->neigh[i]->data->energy-oenergy);
+    }
+    fprintf(stderr, "DE=%f\n",delta_energy);
+    //MONTE CARLOOOOOOOO
+    if(delta_energy>=0){
+#ifdef TS_DOUBLE_DOUBLE
+        if(exp(-delta_energy)< drand48() )
+#endif
+#ifdef TS_DOUBLE_FLOAT
+        if(expf(-delta_energy)< (ts_float)drand48())
+#endif
+#ifdef TS_DOUBLE_LONGDOUBLE
+        if(expl(-delta_energy)< (ts_ldouble)drand48())
+#endif
+    {
+    //not accepted, reverting changes
+    vtx->data->x=xold;
+    vtx->data->y=yold;
+    vtx->data->z=zold;
+    //update the normals of triangles that share bead i.
+    for(i=0;i<vtx->data->tristar_no;i++) triangle_normal_vector(vtx->data->tristar[i]);
+    //energy and curvature
+    energy_vertex(vtx);
+    //the same is done for neighbouring vertices
+    for(i=0;i<vtx->data->neigh_no;i++) energy_vertex(vtx->data->neigh[i]);
+  free(ovtx->data->bond_length);
+    free(ovtx->data->bond_length_dual);
+    free(ovtx);
+    return TS_FAIL; 
+    }
+}
+    //END MONTE CARLOOOOOOO
+
+    //TODO: change cell occupation if necessary!
+
+    free(ovtx->data->bond_length);
+    free(ovtx->data->bond_length_dual);
+    free(ovtx);
+    return TS_SUCCESS;
+}
+
diff --git a/src/vertexmove.h b/src/vertexmove.h
new file mode 100644
index 0000000..0c24d54
--- /dev/null
+++ b/src/vertexmove.h
@@ -0,0 +1,3 @@
+
+ts_bool single_verticle_timestep(ts_vesicle *vesicle,ts_vertex *vtx,ts_double *rn);
+

--
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