From 815f196dfd6f8b6ceebb498fe6a3449bd0b9e819 Mon Sep 17 00:00:00 2001
From: Samo Penic <samo.penic@fe.uni-lj.si>
Date: Fri, 24 Feb 2017 10:39:46 +0000
Subject: [PATCH] Fixed library compilation

---
 src/energy.c |   29 ++++++++++++++++++++++++++++-
 1 files changed, 28 insertions(+), 1 deletions(-)

diff --git a/src/energy.c b/src/energy.c
index cc5ccde..996fb16 100644
--- a/src/energy.c
+++ b/src/energy.c
@@ -200,10 +200,37 @@
 inline ts_bool attraction_bond_energy(ts_bond *bond, ts_double w){
 
 	if(fabs(bond->vtx1->c)>1e-16 && fabs(bond->vtx2->c)>1e-16){
-		bond->energy=w;
+		bond->energy=-w;
 	}
 	else {
 		bond->energy=0.0;
 	}
 	return TS_SUCCESS;
 }
+
+ts_double direct_force_energy(ts_vesicle *vesicle, ts_vertex *vtx, ts_vertex *vtx_old){
+	if(fabs(vtx->c)<1e-15) return 0.0;
+//	printf("was here");
+	if(fabs(vesicle->tape->F)<1e-15) return 0.0;
+
+	ts_double norml,ddp=0.0;
+	ts_uint i;
+	ts_double xnorm=0.0,ynorm=0.0,znorm=0.0;
+	/*find normal of the vertex as sum of all the normals of the triangles surrounding it. */
+	for(i=0;i<vtx->tristar_no;i++){
+			xnorm+=vtx->tristar[i]->xnorm;
+			ynorm+=vtx->tristar[i]->ynorm;
+			znorm+=vtx->tristar[i]->znorm;
+	}
+	/*normalize*/
+	norml=sqrt(xnorm*xnorm+ynorm*ynorm+znorm*znorm);
+	xnorm/=norml;
+	ynorm/=norml;
+	znorm/=norml;
+	/*calculate ddp, perpendicular displacement*/
+	ddp=xnorm*(vtx->x-vtx_old->x)+ynorm*(vtx->y-vtx_old->y)+znorm*(vtx->z-vtx_old->z);
+	/*calculate dE*/
+//	printf("ddp=%e",ddp);
+	return vesicle->tape->F*ddp;		
+	
+}

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