diff --git a/source/blender/blenkernel/BKE_particle.h b/source/blender/blenkernel/BKE_particle.h
index d92e8bad1f9..399f67b7288 100644
--- a/source/blender/blenkernel/BKE_particle.h
+++ b/source/blender/blenkernel/BKE_particle.h
@@ -289,6 +289,8 @@ void psys_particle_on_dm(struct Object *ob, struct DerivedMesh *dm, int from, in
 void initialize_particle(struct ParticleData *pa, int p, struct Object *ob, struct ParticleSystem *psys, struct ParticleSystemModifierData *psmd);
 void reset_particle(struct ParticleData *pa, struct ParticleSystem *psys, struct ParticleSystemModifierData *psmd, struct Object *ob, float dtime, float cfra, float *vg_vel, float *vg_tan, float *vg_rot);
 
+void do_effectors(int pa_no, struct ParticleData *pa, struct ParticleKey *state, struct Object *ob, struct ParticleSystem *psys, float *force_field, float *vel,float framestep, float cfra);
+
 void psys_calc_dmfaces(struct Object *ob, struct DerivedMesh *dm, struct ParticleSystem *psys);
 int psys_particle_dm_face_lookup(struct Object *ob, struct DerivedMesh *dm, int index, float *fw, struct LinkNode *node);
 
diff --git a/source/blender/blenkernel/intern/particle.c b/source/blender/blenkernel/intern/particle.c
index 0ac60e6da4e..8b6d6126124 100644
--- a/source/blender/blenkernel/intern/particle.c
+++ b/source/blender/blenkernel/intern/particle.c
@@ -2249,6 +2249,7 @@ void psys_cache_paths(Object *ob, ParticleSystem *psys, float cfra, int editupda
 	char nosel[4], sel[4];
 	float sel_col[3];
 	float nosel_col[3];
+	float length, vec[3];
 
 	/* we don't have anything valid to create paths from so let's quit here */
 	if((psys->flag & PSYS_HAIR_DONE)==0 && (psys->flag & PSYS_KEYED)==0)
@@ -2417,7 +2418,6 @@ void psys_cache_paths(Object *ob, ParticleSystem *psys, float cfra, int editupda
 				: ((psys->part->flag & PART_HAIR_BSPLINE) ? KEY_BSPLINE : KEY_CARDINAL)
 				,keys, keytime, &result);
 
-
 			/* the velocity needs to be converted back from cubic interpolation */
 			if(psys->flag & PSYS_KEYED){
 				VecMulf(result.vel, frs_sec / dfra);
@@ -2425,12 +2425,49 @@ void psys_cache_paths(Object *ob, ParticleSystem *psys, float cfra, int editupda
 			else if(soft==NULL) { /* softbody and keyed are allready in global space */
 				Mat4MulVecfl(hairmat, result.co);
 			}
-			
+
+			VECCOPY(ca->co, result.co);
+		}
+		
+		/*--modify paths--*/
+
+		VecSubf(vec,(cache[i]+1)->co,cache[i]->co);
+		length = VecLength(vec);
+
+		for(k=0, ca=cache[i]; k<=steps; k++, ca++) {
+			/* apply effectors */
+			if(edit==0 && k) {
+				float force[3] = {0.0f,0.0f,0.0f}, vel[3] = {0.0f,0.0f,0.0f};
+				ParticleKey eff_key;
+
+				VECCOPY(eff_key.co,(ca-1)->co);
+				VECCOPY(eff_key.vel,(ca-1)->vel);
+				QUATCOPY(eff_key.rot,(ca-1)->rot);
+
+				do_effectors(i, pa, &eff_key, ob, psys, force, vel, dfra, cfra);
+
+				VecMulf(force, pow((float)k / (float)steps, 100.0f * psys->part->eff_hair) * steps);
+
+				VecAddf(force, force, vec);
+
+				Normalize(force);
+
+				if(k < steps) {
+					VecSubf(vec, (ca+1)->co, ca->co);
+					length = VecLength(vec);
+				}
+
+				VECADDFAC(ca->co, (ca-1)->co, force, length);
+			}
 
 			/* apply guide curves to path data */
 			if(edit==0 && psys->effectors.first && (psys->part->flag & PART_CHILD_GUIDE)==0)
 				do_guide(&result, i, time, &psys->effectors);
 
+			/* apply lattice */
+			if(psys->lattice && edit==0)
+				calc_latt_deform(ca->co, 1.0f);
+
 			/* figure out rotation */
 			
 			if(k) {
@@ -2439,7 +2476,7 @@ void psys_cache_paths(Object *ob, ParticleSystem *psys, float cfra, int editupda
 				if(k == 1) {
 					float *q2;
 
-					VECSUB(tangent, result.co, (ca - 1)->co);
+					VECSUB(tangent, ca->co, (ca - 1)->co);
 
 					q2 = vectoquat(tangent, OB_POSX, OB_POSZ);
 
@@ -2449,7 +2486,7 @@ void psys_cache_paths(Object *ob, ParticleSystem *psys, float cfra, int editupda
 					Normalize(prev_tangent);
 				}
 				else {
-					VECSUB(tangent, result.co, (ca - 1)->co);
+					VECSUB(tangent, ca->co, (ca - 1)->co);
 					Normalize(tangent);
 					angle = saacos(Inpf(tangent, prev_tangent));
 
@@ -2470,8 +2507,9 @@ void psys_cache_paths(Object *ob, ParticleSystem *psys, float cfra, int editupda
 				}
 			}
 
-			VECCOPY(ca->co, result.co);
 			
+			/* set velocity */
+
 			if(k){
 				VECSUB(ca->vel, ca->co, (ca-1)->co);
 
@@ -2512,9 +2550,6 @@ void psys_cache_paths(Object *ob, ParticleSystem *psys, float cfra, int editupda
 			else{
 				VECCOPY(ca->col, col);
 			}
-
-			if(psys->lattice && edit==0)
-				calc_latt_deform(ca->co, 1.0f);
 		}
 	}
 
@@ -3200,11 +3235,11 @@ void psys_get_particle_on_path(Object *ob, ParticleSystem *psys, int p, Particle
 	ParticleData *pa;
 	ChildParticle *cpa;
 	ParticleTexture ptex;
-	ParticleKey tstate;
+	ParticleKey tstate, *kkey[2] = {NULL, NULL};
 	HairKey *hkey[2];
 	ParticleKey *par=0, keys[4];
 
-	float t, real_t, dfra, keytime;
+	float t, real_t, dfra, keytime, frs_sec = G.scene->r.frs_sec;
 	float co[3], orco[3];
 	float imat[4][4], hairmat[4][4], cpa_1st[3];
 	float pa_clump = 0.0, pa_kink = 0.0;
@@ -3239,19 +3274,39 @@ void psys_get_particle_on_path(Object *ob, ParticleSystem *psys, int p, Particle
 			return;
 		}
 		
-		hkey[0] = pa->hair;
-		hkey[1] = pa->hair + 1;
+		if(psys->flag & PSYS_KEYED) {
+			kkey[0] = pa->keys;
+			kkey[1] = kkey[0] + 1;
 
-		real_t = hkey[0]->time + (hkey[0][pa->totkey-1].time - hkey[0]->time) * t;
+			real_t = kkey[0]->time + t * (kkey[0][pa->totkey-1].time - kkey[0]->time);
+		}
+		else {
+			hkey[0] = pa->hair;
+			hkey[1] = pa->hair + 1;
 
-		while(hkey[1]->time < real_t)
-			hkey[1]++;
+			real_t = hkey[0]->time + (hkey[0][pa->totkey-1].time - hkey[0]->time) * t;
+		}
 
-		hkey[0] = hkey[1] - 1;
+		if(psys->flag & PSYS_KEYED) {
+			while(kkey[1]->time < real_t) {
+				kkey[1]++;
+			}
+			kkey[0] = kkey[1] - 1;
 
-		hair_to_particle(keys + 1, hkey[0]);
-		hair_to_particle(keys + 2, hkey[1]);
+			memcpy(keys + 1, kkey[0], sizeof(ParticleKey));
+			memcpy(keys + 2, kkey[1], sizeof(ParticleKey));
+		}
+		else {
+			while(hkey[1]->time < real_t)
+				hkey[1]++;
 
+			hkey[0] = hkey[1] - 1;
+
+			hair_to_particle(keys + 1, hkey[0]);
+			hair_to_particle(keys + 2, hkey[1]);
+		}
+
+		if((psys->flag & PSYS_KEYED)==0) {
 		//if(soft){
 		//	if(key[0] != sbel.keys)
 		//		DB_copy_key(&k1,key[0]-1);
@@ -3276,6 +3331,7 @@ void psys_get_particle_on_path(Object *ob, ParticleSystem *psys, int p, Particle
 				hair_to_particle(keys + 3, hkey[1] + 1);
 			else
 				hair_to_particle(keys + 3, hkey[1]);
+		}
 		//}
 
 		//psys_get_particle_on_path(bsys,p,t,bkey,ckey[0]);
@@ -3296,24 +3352,38 @@ void psys_get_particle_on_path(Object *ob, ParticleSystem *psys, int p, Particle
 
 		keytime = (real_t - keys[1].time) / dfra;
 
-		interpolate_particle((psys->part->flag & PART_HAIR_BSPLINE) ? KEY_BSPLINE : KEY_CARDINAL
+		/* convert velocity to timestep size */
+		if(psys->flag & PSYS_KEYED){
+			VecMulf(keys[1].vel, dfra / frs_sec);
+			VecMulf(keys[2].vel, dfra / frs_sec);
+			QuatInterpol(state->rot,keys[1].rot,keys[2].rot,keytime);
+		}
+
+		interpolate_particle((psys->flag & PSYS_KEYED) ? -1 /* signal for cubic interpolation */
+			: ((psys->part->flag & PART_HAIR_BSPLINE) ? KEY_BSPLINE : KEY_CARDINAL)
 			,keys, keytime, state);
 
-		if((pa->flag & PARS_REKEY)==0) {
-			psys_mat_hair_to_global(ob, psmd->dm, part->from, pa, hairmat);
-			Mat4MulVecfl(hairmat, state->co);
+		/* the velocity needs to be converted back from cubic interpolation */
+		if(psys->flag & PSYS_KEYED){
+			VecMulf(state->vel, frs_sec / dfra);
+		}
+		else {
+			if((pa->flag & PARS_REKEY)==0) {
+				psys_mat_hair_to_global(ob, psmd->dm, part->from, pa, hairmat);
+				Mat4MulVecfl(hairmat, state->co);
 
-			if(psys->effectors.first && (part->flag & PART_CHILD_GUIDE)==0) {
-				do_guide(state, p, state->time, &psys->effectors);
-				/* TODO: proper velocity handling */
+				if(psys->effectors.first && (part->flag & PART_CHILD_GUIDE)==0) {
+					do_guide(state, p, state->time, &psys->effectors);
+					/* TODO: proper velocity handling */
+				}
+
+				if(psys->lattice && edit==0)
+					calc_latt_deform(state->co,1.0f);
 			}
-
-			if(psys->lattice && edit==0)
-				calc_latt_deform(state->co,1.0f);
 		}
 	}
 	else if(totchild){
-		Mat4Invert(imat,ob->obmat);
+		//Mat4Invert(imat,ob->obmat);
 		
 		cpa=psys->child+p-totpart;
 		
@@ -3345,19 +3415,9 @@ void psys_get_particle_on_path(Object *ob, ParticleSystem *psys, int p, Particle
 			psys_particle_on_emitter(ob,psmd,cpa_from,cpa_num,DMCACHE_ISCHILD,cpa->fuv,foffset,co,0,0,0,orco,0);
 
 			/* we need to save the actual root position of the child for positioning it accurately to the surface of the emitter */
-			VECCOPY(cpa_1st,co);
+			//VECCOPY(cpa_1st,co);
 
-			//w=0;
-			//while(w<4 && cpa->pa[w]>=0){
-			//	pa=psys->particles+cpa->pa[w];
-			//	psys_particle_on_emitter(ob,psmd,part->from,pa->num,pa->fuv,pa->foffset,vec,0,0,0);
-			//	cpa_1st[0] -= cpa->w[w]*vec[0];
-			//	cpa_1st[1] -= cpa->w[w]*vec[1];
-			//	cpa_1st[2] -= cpa->w[w]*vec[2];
-			//	w++;
-			//}
-
-			Mat4MulVecfl(ob->obmat,cpa_1st);
+			//Mat4MulVecfl(ob->obmat,cpa_1st);
 
 			pa=0;
 		}
@@ -3412,7 +3472,7 @@ void psys_get_particle_on_path(Object *ob, ParticleSystem *psys, int p, Particle
 				w++;
 			}
 			/* apply offset for correct positioning */
-			VECADD(state->co,state->co,cpa_1st);
+			//VECADD(state->co,state->co,cpa_1st);
 		}
 		else{
 			/* offset the child from the parent position */
@@ -3452,19 +3512,18 @@ void psys_get_particle_on_path(Object *ob, ParticleSystem *psys, int p, Particle
 		if(part->rough_end != 0.0)
 			do_rough_end(cpa->rand, t, part->rough_end, part->rough_end_shape, state, par); 
 
-		if(vel){
-			if(t>=0.001f){
-				tstate.time=t-0.001f;
-				psys_get_particle_on_path(ob,psys,p,&tstate,0);
-				VECSUB(state->vel,state->co,tstate.co);
-			}
-			else{
-				tstate.time=t+0.001f;
-				psys_get_particle_on_path(ob,psys,p,&tstate,0);
-				VECSUB(state->vel,tstate.co,state->co);
-			}
-		}
-
+		//if(vel){
+		//	if(t>=0.001f){
+		//		tstate.time=t-0.001f;
+		//		psys_get_particle_on_path(ob,psys,p,&tstate,0);
+		//		VECSUB(state->vel,state->co,tstate.co);
+		//	}
+		//	else{
+		//		tstate.time=t+0.001f;
+		//		psys_get_particle_on_path(ob,psys,p,&tstate,0);
+		//		VECSUB(state->vel,tstate.co,state->co);
+		//	}
+		//}
 	}
 }
 /* gets particle's state at a time, returns 1 if particle exists and can be seen and 0 if not */
@@ -3505,18 +3564,18 @@ int psys_get_particle_state(Object *ob, ParticleSystem *psys, int p, ParticleKey
 				return 0;
 	}
 
-	//if(bsys->flag & (BSYS_DONE|BSYS_KEYED)){
-	//	if(between){
-	//		//ChildParticle *cpa=psys->child+p-totpart;
-	//		//state->time= (cfra-(part->sta+(part->end-part->sta)*cpa->rand[0]))/(part->lifetime*cpa->rand[1]);
-	//	}
-	//	else
-	//		state->time= (cfra-pa->time)/(pa->dietime-pa->time);//pa->lifetime;
+	if(psys->flag & PSYS_KEYED){
+		if(between){
+			ChildParticle *cpa=psys->child+p-totpart;
+			state->time= (cfra-(part->sta+(part->end-part->sta)*cpa->rand[0]))/(part->lifetime*cpa->rand[1]);
+		}
+		else
+			state->time= (cfra-pa->time)/(pa->dietime-pa->time);
 
-	//	psys_get_particle_on_path(ob,psys,p,state,1);
-	//	return 1;
-	//}
-	//else{
+		psys_get_particle_on_path(ob,psys,p,state,1);
+		return 1;
+	}
+	else{
 		//if(psys->totchild && p>=psys->totpart){
 		//	ChildParticle *cpa=psys->child+p-psys->totpart;
 		//	ParticleKey *key1, skey;
@@ -3560,7 +3619,7 @@ int psys_get_particle_state(Object *ob, ParticleSystem *psys, int p, ParticleKey
 		//}
 		
 		return 1;
-	//}
+	}
 }
 
 void psys_get_dupli_texture(Object *ob, ParticleSettings *part, ParticleSystemModifierData *psmd, ParticleData *pa, ChildParticle *cpa, float *uv, float *orco)
diff --git a/source/blender/blenkernel/intern/particle_system.c b/source/blender/blenkernel/intern/particle_system.c
index f69e7bcd05f..94cfdadbb16 100644
--- a/source/blender/blenkernel/intern/particle_system.c
+++ b/source/blender/blenkernel/intern/particle_system.c
@@ -2607,7 +2607,7 @@ static void precalc_effectors(Object *ob, ParticleSystem *psys, ParticleSystemMo
 
 
 /* calculate forces that all effectors apply to a particle*/
-static void do_effectors(int pa_no, ParticleData *pa, ParticleKey *state, Object *ob, ParticleSystem *psys, float *force_field, float *vel,float framestep, float cfra)
+void do_effectors(int pa_no, ParticleData *pa, ParticleKey *state, Object *ob, ParticleSystem *psys, float *force_field, float *vel,float framestep, float cfra)
 {
 	Object *eob;
 	ParticleSystem *epsys;
@@ -4050,12 +4050,16 @@ static void dynamics_step(Object *ob, ParticleSystem *psys, ParticleSystemModifi
 				pa->alive=PARS_UNBORN;
 			}
 			else{
-				pa->loop=0;
-				if(cfra<=pa->time)
-					pa->alive=PARS_UNBORN;
+				pa->loop = 0;
+				if(cfra <= pa->time)
+					pa->alive = PARS_UNBORN;
 						/* without dynamics the state is allways known so no need to kill */
-				else if(ELEM(part->phystype,PART_PHYS_NO,PART_PHYS_KEYED)==0)
-					pa->alive=PARS_KILLED;
+				else if(ELEM(part->phystype, PART_PHYS_NO, PART_PHYS_KEYED)){
+					if(cfra < pa->dietime)
+						pa->alive = PARS_ALIVE;
+				}
+				else
+					pa->alive = PARS_KILLED;
 			}
 		}
 
@@ -4398,7 +4402,9 @@ static void system_step(Object *ob, ParticleSystem *psys, ParticleSystemModifier
 			return;
 		}
 	}
-	else if(part->phystype != PART_PHYS_NO) {	/* cache shouldn't be used for none physics */
+	else if(ELEM(part->phystype, PART_PHYS_NO, PART_PHYS_KEYED))
+		; /* cache shouldn't be used for "none" or "keyed" physics */
+	else {
 		if(psys->recalc && (psys->flag & PSYS_PROTECT_CACHE) == 0)
 			clear_particles_from_cache(ob,psys,(int)cfra);
 		else if(get_particles_from_cache(ob, psys, (int)cfra)) {
@@ -4500,9 +4506,12 @@ static void system_step(Object *ob, ParticleSystem *psys, ParticleSystemModifier
 		dynamics_step(ob,psys,psmd,cfra,vg_vel,vg_tan,vg_rot,vg_size);
 
 	psys->recalc = 0;
-	psys->cfra=cfra;
+	psys->cfra = cfra;
 
-	if(part->type!=PART_HAIR)
+	if(part->type == PART_HAIR || part->phystype == PART_PHYS_NO
+		|| (part->phystype == PART_PHYS_KEYED && psys->flag & PSYS_FIRST_KEYED))
+		; /* cache shouldn't be used for hair or "none" or "first keyed" physics */
+	else
 		write_particles_to_cache(ob, psys, cfra);
 
 	/* for keyed particles the path is allways known so it can be drawn */
diff --git a/source/blender/blenloader/intern/readfile.c b/source/blender/blenloader/intern/readfile.c
index 4812d7e3904..6a2e3aa481a 100644
--- a/source/blender/blenloader/intern/readfile.c
+++ b/source/blender/blenloader/intern/readfile.c
@@ -2526,6 +2526,11 @@ static void direct_link_particlesystems(FileData *fd, ListBase *particles)
 			for(a=0; a<psys->totpart; a++, pa++)
 				pa->hair=newdataadr(fd,pa->hair);
 		}
+		if(psys->particles && psys->particles->keys){
+			ParticleData *pa = psys->particles;
+			for(a=0; a<psys->totpart; a++, pa++)
+				pa->keys=newdataadr(fd,pa->keys);
+		}
 		psys->child=newdataadr(fd,psys->child);
 		psys->effectors.first=psys->effectors.last=0;
 
diff --git a/source/blender/blenloader/intern/writefile.c b/source/blender/blenloader/intern/writefile.c
index 9c013fbc1d0..fdea98c7ab2 100644
--- a/source/blender/blenloader/intern/writefile.c
+++ b/source/blender/blenloader/intern/writefile.c
@@ -558,6 +558,13 @@ static void write_particlesystems(WriteData *wd, ListBase *particles)
 				for(a=0; a<psys->totpart; a++, pa++)
 					writestruct(wd, DATA, "HairKey", pa->totkey, pa->hair);
 			}
+			
+			if(psys->particles->keys) {
+				ParticleData *pa = psys->particles;
+
+				for(a=0; a<psys->totpart; a++, pa++)
+					writestruct(wd, DATA, "ParticleKey", pa->totkey, pa->keys);
+			}
 		}
 		if(psys->child) writestruct(wd, DATA, "ChildParticle", psys->totchild ,psys->child);
 		writestruct(wd, DATA, "SoftBody", 1, psys->soft);
diff --git a/source/blender/makesdna/DNA_particle_types.h b/source/blender/makesdna/DNA_particle_types.h
index f83c2a59799..d39fbbbc679 100644
--- a/source/blender/makesdna/DNA_particle_types.h
+++ b/source/blender/makesdna/DNA_particle_types.h
@@ -128,7 +128,7 @@ typedef struct ParticleSettings {
 
 	/* general values */
 	float sta, end, lifetime, randlife;
-	float timetweak, jitfac, keyed_time;
+	float timetweak, jitfac, keyed_time, eff_hair, rt;
 	int totpart, userjit, grid_res;
 
 	/* initial velocity factors */
diff --git a/source/blender/src/buttons_object.c b/source/blender/src/buttons_object.c
index 1815fdd06f2..5443aa1de5e 100644
--- a/source/blender/src/buttons_object.c
+++ b/source/blender/src/buttons_object.c
@@ -3912,9 +3912,13 @@ static void object_panel_particle_extra(Object *ob)
 	buty=butx=160;
 
 	uiDefButI(block, NUM, B_PART_DISTR, "Seed:",				butx,(buty-=buth),butw,buth, &psys->seed, 0.0, 255.0, 1, 0, "Set an offset in the random table");
+	if(part->type == PART_HAIR && psys->flag & PSYS_EDITED)
+		uiDefButF(block, NUM, B_PART_RECALC, "Stiff:",	butx,(buty-=buth),butw,buth, &part->eff_hair, 0.0, 1.0, 0, 0, "Hair stiffness for effectors");
+	else
+		buty-=buth;
 
 	/* size changes must create a recalc event always so that sizes are updated properly */
-	uiDefButF(block, NUM, B_PART_RECALC, "Size:",	butx,(buty-=2*buth),butw,buth, &part->size, 0.01, 100, 10, 1, "The size of the particles");
+	uiDefButF(block, NUM, B_PART_RECALC, "Size:",	butx,(buty-=buth),butw,buth, &part->size, 0.01, 100, 10, 1, "The size of the particles");
 	uiDefButF(block, NUM, B_PART_RECALC, "Rand:",	butx,(buty-=buth),butw,buth, &part->randsize, 0.0, 2.0, 10, 1, "Give the particle size a random variation");
 
 	uiDefButBitI(block, TOG, PART_SIZEMASS, B_PART_RECALC, "Mass from size",	 butx,(buty-=buth),butw,buth, &part->flag, 0, 0, 0, 0, "Multiply mass with particle size");
diff --git a/source/blender/src/drawobject.c b/source/blender/src/drawobject.c
index 2ae272cd5ba..3e154298517 100644
--- a/source/blender/src/drawobject.c
+++ b/source/blender/src/drawobject.c
@@ -3037,7 +3037,7 @@ static void draw_new_particle_system(Base *base, ParticleSystem *psys)
 
 	psys->flag|=PSYS_DRAWING;
 
-	if(!psys->childcache)
+	if(part->type==PART_HAIR && !psys->childcache)
 		totchild=0;
 	else
 		totchild=psys->totchild*part->disp/100;