path: root/vbap.c

/* vbap.c vers 0.99 for max4.0

written by Ville Pulkki 1999-2001
Helsinki University of Technology 
and 
Unversity of California at Berkeley

See copyright in file with name COPYRIGHT  */

#ifdef NT
#define sqrtf sqrt
#endif

#include <math.h>
#include "m_pd.h"				/* you must include this - it contains the external object's link to pure data */

#define RES_ID 9171 				/* resource ID for assistance (we'll add that later) */
#define MAX_LS_SETS 100				/* maximum number of loudspeaker sets (triplets or pairs) allowed */
#define MAX_LS_AMOUNT 55			/* maximum amount of loudspeakers, can be increased */

typedef struct vbap				/* This defines the object as an entity made up of other things */
{
	t_object x_ob;				
	t_float x_azi; 				/* panning direction azimuth */
	t_float x_ele;				/* panning direction elevation */
	void *x_outlet0;			/* outlet creation - inlets are automatic */
	void *x_outlet1;				
	void *x_outlet2;				
	void *x_outlet3;				
	float x_set_inv_matx[MAX_LS_SETS][9];  /* inverse matrice for each loudspeaker set */
	float x_set_matx[MAX_LS_SETS][9];      /* matrice for each loudspeaker set */
	long x_lsset[MAX_LS_SETS][3];          /* channel numbers of loudspeakers in each LS set */
	long x_lsset_available;			/* have loudspeaker sets been defined with define_loudspeakers */
	long x_lsset_amount;			/* amount of loudspeaker sets */
	long x_ls_amount;                      /* amount of loudspeakers */
	long x_dimension;                      /* 2 or 3 */
	t_float x_spread;                         /* speading amount of virtual source (0-100) */
	float x_spread_base[3];                /* used to create uniform spreading */
} t_vbap;

/* Globals */

void new_spread_dir(t_vbap *x, float spreaddir[3], float vscartdir[3], float spread_base[3]);
void new_spread_base(t_vbap *x, float spreaddir[3], float vscartdir[3]);
static t_class *vbap_class;				
void cross_prod(float v1[3], float v2[3],
                float v3[3]);
void additive_vbap(float *final_gs, float cartdir[3], t_vbap *x);
void vbap_bang(t_vbap *x);
void vbap_int(t_vbap *x, t_float n);
void vbap_matrix(t_vbap *x, t_symbol *s, int ac, t_atom *av);
void vbap_in1(t_vbap *x, long n);
void vbap_in2(t_vbap *x, long n);
void vbap_in3(t_vbap *x, long n);
void spread_it(t_vbap *x, float *final_gs);
static void *vbap_new(t_symbol *s, int ac, t_atom *av); /* using A_GIMME - typed message list */
void vbap(float g[3], long ls[3], t_vbap *x);
void angle_to_cart(long azi, long ele, float res[3]);
void cart_to_angle(float cvec[3], float avec[3]);

/* above are the prototypes for the methods/procedures/functions you will use */

void vbap_setup(void)
{
	vbap_class = class_new(gensym("vbap"), (t_newmethod)vbap_new, 0, (short)sizeof(t_vbap), 0, A_GIMME, 0); 
	/* vbap_new = creation function, A_DEFLONG = its (optional) arguement is a long (32-bit) int */

/* max methods ... */
/*
/*	addbang((method)vbap_bang);			/* the procedure it uses when it gets a bang in the left inlet */
/*	addint((method)vbap_int);			/* the rocedure for an int in the left inlet (inlet 0) */
/*	addinx((method)vbap_in1, 1);		/* the rocedure for an int in the right inlet (inlet 1) */
/*	addinx((method)vbap_in2, 2);		/* the rocedure for an int in the right inlet (inlet 2) */
/*	addinx((method)vbap_in3, 3);
/*	addmess((method)vbap_matrix, "loudspeaker-matrices", A_GIMME, 0); */

/* pure data: */

	class_addbang(vbap_class, vbap_bang);
	class_addfloat(vbap_class, vbap_int);
	class_addmethod(vbap_class, (t_method)vbap_matrix, gensym("loudspeaker-matrices"), A_GIMME, 0);
}


void angle_to_cart(long azi, long ele, float res[3])
/* converts angular coordinates to cartesian */
{ 
  float atorad = (2 * 3.1415927 / 360) ;
  res[0] = cos((float) azi * atorad) * cos((float) ele * atorad);
  res[1] = sin((float) azi * atorad) * cos((float) ele * atorad);
  res[2] = sin((float) ele * atorad);
}

void cart_to_angle(float cvec[3], float avec[3])
/* converts cartesian coordinates to angular */
{
  float tmp, tmp2, tmp3, tmp4;
  float atorad = (2 * 3.1415927 / 360) ;
  float pi =  3.1415927;
  float power;
  float dist, atan_y_per_x, atan_x_pl_y_per_z;
  float azi, ele;
  
  if(cvec[0]==0.0)
  	atan_y_per_x = pi / 2;
  else
    atan_y_per_x = atan(cvec[1] / cvec[0]);
  azi = atan_y_per_x / atorad;
  if(cvec[0]<0.0)
    azi +=180;
  dist = sqrt(cvec[0]*cvec[0] + cvec[1]*cvec[1]);
  if(cvec[2]==0.0)
    atan_x_pl_y_per_z = 0.0;
  else
    atan_x_pl_y_per_z = atan(cvec[2] / dist);
  if(dist == 0.0)
    if(cvec[2]<0.0)
      atan_x_pl_y_per_z = -pi/2.0;
    else
      atan_x_pl_y_per_z = pi/2.0;
  ele = atan_x_pl_y_per_z / atorad;
  dist = sqrtf(cvec[0] * cvec[0] +cvec[1] * cvec[1] +cvec[2]*cvec[2]);
  avec[0]=azi;
  avec[1]=ele;
  avec[2]=dist;
}


void vbap(float g[3], long ls[3], t_vbap *x)
{
  /* calculates gain factors using loudspeaker setup and given direction */
  float power;
  int i,j,k, gains_modified;
  float small_g;
  float big_sm_g, gtmp[3];
  long winner_set;
  float cartdir[3];
  float new_cartdir[3];
  float new_angle_dir[3];
  long dim = x->x_dimension;
  long neg_g_am, best_neg_g_am;
  
  /* transfering the azimuth angle to a decent value */
  while(x->x_azi > 180)
  	x->x_azi -= 360;
  while(x->x_azi < -179)
  	x->x_azi += 360;
  	
  /* transferring the elevation to a decent value */
  if(dim == 3){
  	while(x->x_ele > 180)
  		x->x_ele -= 360;
  	while(x->x_ele < -179)
  		x->x_ele += 360;
  } else
  	x->x_ele = 0;
  
  
  /* go through all defined loudspeaker sets and find the set which
  // has all positive values. If such is not found, set with largest
  // minimum value is chosen. If at least one of gain factors of one LS set is negative
  // it means that the virtual source does not lie in that LS set. */
  
  angle_to_cart(x->x_azi,x->x_ele,cartdir);
  big_sm_g = -100000.0;   /* initial value for largest minimum gain value */
  best_neg_g_am=3; 		  /* how many negative values in this set */
  
  
  for(i=0;i<x->x_lsset_amount;i++){
    small_g = 10000000.0;
    neg_g_am = 3;
    for(j=0;j<dim;j++){
      gtmp[j]=0.0;
      for(k=0;k<dim;k++)
        gtmp[j]+=cartdir[k]* x->x_set_inv_matx[i][k+j*dim];
      if(gtmp[j] < small_g)
        small_g = gtmp[j];
      if(gtmp[j]>= -0.01)
      	neg_g_am--;
    }
    if(small_g > big_sm_g && neg_g_am <= best_neg_g_am){
      big_sm_g = small_g;
      best_neg_g_am = neg_g_am; 
      winner_set=i;
      g[0]=gtmp[0]; g[1]=gtmp[1];
      ls[0]= x->x_lsset[i][0]; ls[1]= x->x_lsset[i][1];
      if(dim==3){
      	g[2]=gtmp[2];
        ls[2]= x->x_lsset[i][2];
      } else {
        g[2]=0.0;
        ls[2]=0;
      }
    }
  }
  
  /* If chosen set produced a negative value, make it zero and
  // calculate direction that corresponds  to these new
  // gain values. This happens when the virtual source is outside of
  // all loudspeaker sets. */
  
  if(dim==3){
  	gains_modified=0;
  	for(i=0;i<dim;i++)
  		if(g[i]<-0.01){
  			g[i]=0.0001;
  			gains_modified=1;
  		}	
 	if(gains_modified==1){
 	 	new_cartdir[0] =  x->x_set_matx[winner_set][0] * g[0] 
 	 					+ x->x_set_matx[winner_set][1] * g[1]
 	 					+ x->x_set_matx[winner_set][2] * g[2];
 	 	new_cartdir[1] =  x->x_set_matx[winner_set][3] * g[0] 
 	 					+ x->x_set_matx[winner_set][4] * g[1] 
 	 					+ x->x_set_matx[winner_set][5] * g[2];
 	 	new_cartdir[2] =  x->x_set_matx[winner_set][6] * g[0] 
 	 					+ x->x_set_matx[winner_set][7] * g[1]
 	 					+ x->x_set_matx[winner_set][8] * g[2];
 	 	cart_to_angle(new_cartdir,new_angle_dir);
 	 	x->x_azi = (long) (new_angle_dir[0] + 0.5);
 	 	x->x_ele = (long) (new_angle_dir[1] + 0.5);
 	 }
  }
  
  power=sqrt(g[0]*g[0] + g[1]*g[1] + g[2]*g[2]);
  g[0] /= power;
  g[1] /= power;
  g[2] /= power;
}


void cross_prod(float v1[3], float v2[3],
                float v3[3]) 
/* vector cross product */
{
  float length;
  v3[0] = (v1[1] * v2[2] ) - (v1[2] * v2[1]);
  v3[1] = (v1[2] * v2[0] ) - (v1[0] * v2[2]);
  v3[2] = (v1[0] * v2[1] ) - (v1[1] * v2[0]);

  length= sqrt(v3[0]*v3[0] + v3[1]*v3[1] + v3[2]*v3[2]);
  v3[0] /= length;
  v3[1] /= length;
  v3[2] /= length;
}

void additive_vbap(float *final_gs, float cartdir[3], t_vbap *x)
/* calculates gains to be added to previous gains, used in
// multiple direction panning (source spreading) */
{
	float power;
    int i,j,k, gains_modified;
  	float small_g;
  	float big_sm_g, gtmp[3];
  	long winner_set;
  	float new_cartdir[3];
  	float new_angle_dir[3];
  	long dim = x->x_dimension;
  	long neg_g_am, best_neg_g_am;
	float g[3];
	long ls[3];
	
  	big_sm_g = -100000.0;
  	best_neg_g_am=3;
  
  	for(i=0;i<x->x_lsset_amount;i++){
  	  small_g = 10000000.0;
  	  neg_g_am = 3;
  	  for(j=0;j<dim;j++){
  	    gtmp[j]=0.0;
  	    for(k=0;k<dim;k++)
  	      gtmp[j]+=cartdir[k]* x->x_set_inv_matx[i][k+j*dim];
  	    if(gtmp[j] < small_g)
  	      small_g = gtmp[j];
  	    if(gtmp[j]>= -0.01)
  	    	neg_g_am--;
    	}
    	if(small_g > big_sm_g && neg_g_am <= best_neg_g_am){
      	big_sm_g = small_g;
      	best_neg_g_am = neg_g_am; 
      	winner_set=i;
      	g[0]=gtmp[0]; g[1]=gtmp[1];
      	ls[0]= x->x_lsset[i][0]; ls[1]= x->x_lsset[i][1];
      	if(dim==3){
      		g[2]=gtmp[2];
      	  	ls[2]= x->x_lsset[i][2];
      	} else {
      	  	g[2]=0.0;
      	  	ls[2]=0;
      	}
    	}
  	}

  	gains_modified=0;
  	for(i=0;i<dim;i++)
  		if(g[i]<-0.01){
  			gains_modified=1;
  		}
  
  	if(gains_modified != 1){
  		power=sqrt(g[0]*g[0] + g[1]*g[1] + g[2]*g[2]);
  		g[0] /= power;
  		g[1] /= power;
  		g[2] /= power;
  		
  		final_gs[ls[0]-1] += g[0];
  		final_gs[ls[1]-1] += g[1];
  		final_gs[ls[2]-1] += g[2];
  	}
}


void new_spread_dir(t_vbap *x, float spreaddir[3], float vscartdir[3], float spread_base[3])
/* subroutine for spreading */
{
	float beta,gamma;
	float a,b;
	float pi = 3.1415927;
	float power;
	
	gamma = acos(vscartdir[0] * spread_base[0] +
					vscartdir[1] * spread_base[1] +
					vscartdir[2] * spread_base[2])/pi*180;
	if(fabs(gamma) < 1){
		angle_to_cart(x->x_azi+90, 0, spread_base);
		gamma = acos(vscartdir[0] * spread_base[0] +
					vscartdir[1] * spread_base[1] +
					vscartdir[2] * spread_base[2])/pi*180;
	}
	beta = 180 - gamma;
	b=sin(x->x_spread * pi / 180) / sin(beta * pi / 180);
	a=sin((180- x->x_spread - beta) * pi / 180) / sin (beta * pi / 180);
	spreaddir[0] = a * vscartdir[0] + b * spread_base[0];
	spreaddir[1] = a * vscartdir[1] + b * spread_base[1];
	spreaddir[2] = a * vscartdir[2] + b * spread_base[2];
	
	power=sqrt(spreaddir[0]*spreaddir[0] + spreaddir[1]*spreaddir[1] 
				+ spreaddir[2]*spreaddir[2]);
  	spreaddir[0] /= power;
  	spreaddir[1] /= power;
  	spreaddir[2] /= power;
}

void new_spread_base(t_vbap *x, float spreaddir[3], float vscartdir[3])
/* subroutine for spreading */
{
	float d;
	float pi = 3.1415927;
	float power;
	
	d = cos(x->x_spread/180*pi);
	x->x_spread_base[0] = spreaddir[0] - d * vscartdir[0];
	x->x_spread_base[1] = spreaddir[1] - d * vscartdir[1];
	x->x_spread_base[2] = spreaddir[2] - d * vscartdir[2];
	power=sqrt(x->x_spread_base[0]*x->x_spread_base[0] + x->x_spread_base[1]*x->x_spread_base[1] 
				+ x->x_spread_base[2]*x->x_spread_base[2]);
  	x->x_spread_base[0] /= power;
  	x->x_spread_base[1] /= power;
  	x->x_spread_base[2] /= power;
}

void spread_it(t_vbap *x, float *final_gs)
/*
// apply the sound signal to multiple panning directions
// that causes some spreading.
// See theory in paper V. Pulkki "Uniform spreading of amplitude panned
// virtual sources" in WASPAA 99
*/
{
	float vscartdir[3];
	float spreaddir[16][3];
	float spreadbase[16][3];
	long i, spreaddirnum;
	float power;
	if(x->x_dimension == 3){
		spreaddirnum=16;
		angle_to_cart(x->x_azi,x->x_ele,vscartdir);
		new_spread_dir(x, spreaddir[0], vscartdir, x->x_spread_base);
		new_spread_base(x, spreaddir[0], vscartdir);
		cross_prod(x->x_spread_base, vscartdir, spreadbase[1]); /* four orthogonal dirs */
		cross_prod(spreadbase[1], vscartdir, spreadbase[2]);
		cross_prod(spreadbase[2], vscartdir, spreadbase[3]);
	
		/* four between them */
		for(i=0;i<3;i++) spreadbase[4][i] =  (x->x_spread_base[i] + spreadbase[1][i]) / 2.0;
		for(i=0;i<3;i++) spreadbase[5][i] =  (spreadbase[1][i] + spreadbase[2][i]) / 2.0;
		for(i=0;i<3;i++) spreadbase[6][i] =  (spreadbase[2][i] + spreadbase[3][i]) / 2.0;
		for(i=0;i<3;i++) spreadbase[7][i] =  (spreadbase[3][i] + x->x_spread_base[i]) / 2.0;
		
		/* four at half spreadangle */
		for(i=0;i<3;i++) spreadbase[8][i] =  (vscartdir[i] + x->x_spread_base[i]) / 2.0;
		for(i=0;i<3;i++) spreadbase[9][i] =  (vscartdir[i] + spreadbase[1][i]) / 2.0;
		for(i=0;i<3;i++) spreadbase[10][i] =  (vscartdir[i] + spreadbase[2][i]) / 2.0;
		for(i=0;i<3;i++) spreadbase[11][i] =  (vscartdir[i] + spreadbase[3][i]) / 2.0;
		
		/* four at quarter spreadangle */
		for(i=0;i<3;i++) spreadbase[12][i] =  (vscartdir[i] + spreadbase[8][i]) / 2.0;
		for(i=0;i<3;i++) spreadbase[13][i] =  (vscartdir[i] + spreadbase[9][i]) / 2.0;
		for(i=0;i<3;i++) spreadbase[14][i] =  (vscartdir[i] + spreadbase[10][i]) / 2.0;
		for(i=0;i<3;i++) spreadbase[15][i] =  (vscartdir[i] + spreadbase[11][i]) / 2.0;
		
		additive_vbap(final_gs,spreaddir[0],x); 
		for(i=1;i<spreaddirnum;i++){
			new_spread_dir(x, spreaddir[i], vscartdir, spreadbase[i]);
			additive_vbap(final_gs,spreaddir[i],x); 
		}
	} else if (x->x_dimension == 2) {
		spreaddirnum=6;		
		
		angle_to_cart(x->x_azi - x->x_spread, 0, spreaddir[0]);
		angle_to_cart(x->x_azi - x->x_spread/2, 0, spreaddir[1]);
		angle_to_cart(x->x_azi - x->x_spread/4, 0, spreaddir[2]);
		angle_to_cart(x->x_azi + x->x_spread/4, 0, spreaddir[3]);
		angle_to_cart(x->x_azi + x->x_spread/2, 0, spreaddir[4]);
		angle_to_cart(x->x_azi + x->x_spread, 0, spreaddir[5]);
		
		for(i=0;i<spreaddirnum;i++)
			additive_vbap(final_gs,spreaddir[i],x); 
	} else
		return;
		
	if(x->x_spread > 70)
		for(i=0;i<x->x_ls_amount;i++){
			final_gs[i] += (x->x_spread - 70) / 30.0 * (x->x_spread - 70) / 30.0 * 10.0;
		}
	
	for(i=0,power=0.0;i<x->x_ls_amount;i++){
		power += final_gs[i] * final_gs[i];
	}
		
	power = sqrt(power);
	for(i=0;i<x->x_ls_amount;i++){
		final_gs[i] /= power;
	}
}	
	

void vbap_bang(t_vbap *x)			
/* top level, vbap gains are calculated and outputted */
{
	t_atom at[MAX_LS_AMOUNT]; 
	float g[3];
	long ls[3];
	long i;
	float *final_gs;
	
	final_gs = (float *) getbytes(x->x_ls_amount * sizeof(float));
	if(x->x_lsset_available ==1){
		vbap(g,ls, x);
		for(i=0;i<x->x_ls_amount;i++)
			final_gs[i]=0.0; 			
		for(i=0;i<x->x_dimension;i++){
			final_gs[ls[i]-1]=g[i];  
			}
		if(x->x_spread != 0){
			spread_it(x,final_gs);
		}
		for(i=0;i<x->x_ls_amount;i++) {
			SETFLOAT(&at[0], (t_float)i);	
			SETFLOAT(&at[1], (t_float)final_gs[i]);
			outlet_list(x->x_outlet0, gensym("list") /* was: 0L */, 2, at);
		}
		outlet_float(x->x_outlet1, x->x_azi); 
		outlet_float(x->x_outlet2, x->x_ele); 
		outlet_float(x->x_outlet3, x->x_spread); 
	}
	else
		post("vbap: Configure loudspeakers first!",0);
/*	freebytes(final_gs, x->x_ls_amount * sizeof(float)); /* bug fix added 9/00 */
}

/*--------------------------------------------------------------------------*/

void vbap_int(t_vbap *x, t_float n) /* x = the instance of the object, n = the int received in the right inlet */
{
 /* do something if an int comes in the left inlet??? */
}

void vbap_matrix(t_vbap *x, t_symbol *s, int ac, t_atom *av)
/* read in loudspeaker matrices */
{
	long counter;
	long datapointer=0;
	long setpointer=0;
	long i;
	long deb=0;
 
 	if(ac>0) 
/* 		if(av[datapointer].a_type == A_LONG){
 			x->x_dimension = av[datapointer++].a_w.w_long;
 			x->x_lsset_available=1;
 		} else */
 		if(av[datapointer].a_type == A_FLOAT){
 			x->x_dimension = (long) av[datapointer++].a_w.w_float;
 			x->x_lsset_available=1;
 		} else {
 			post("Error in loudspeaker data!",0);
 			x->x_lsset_available=0;
 			return;
 		}
/* 	post("%d",deb++); */
 	if(ac>1) 
/* 		if(av[datapointer].a_type == A_LONG)
 			x->x_ls_amount = av[datapointer++].a_w.w_long;
 		else */
 		if(av[datapointer].a_type == A_FLOAT)
 			x->x_ls_amount = (long) av[datapointer++].a_w.w_float;
 		else {
 			post("vbap: Error in loudspeaker data!",0);
 			x->x_lsset_available=0;
 			return;
 		}
 	else
 		x->x_lsset_available=0;
 	
/* 	post("%d",deb++); */
 	if(x->x_dimension == 3)
 		counter = (ac - 2) / ((x->x_dimension * x->x_dimension*2) + x->x_dimension);
 	if(x->x_dimension == 2)
 		counter = (ac - 2) / ((x->x_dimension * x->x_dimension) + x->x_dimension);
 	x->x_lsset_amount=counter;

 	if(counter<=0){
 		post("vbap: Error in loudspeaker data!",0);
 		x->x_lsset_available=0;
 		return;
 	}
 	
 
 	while(counter-- > 0){
 		for(i=0; i < x->x_dimension; i++){
 			if(av[datapointer].a_type == A_FLOAT){
 				 x->x_lsset[setpointer][i]=(long)av[datapointer++].a_w.w_float;
/* 				post("%d",deb++); */
 			}
 			else{
 				post("vbap: Error in loudspeaker data!",0);
 				x->x_lsset_available=0;
 				return;
 			}
 		}	

 		for(i=0; i < x->x_dimension*x->x_dimension; i++){
 			if(av[datapointer].a_type == A_FLOAT){
 				x->x_set_inv_matx[setpointer][i]=av[datapointer++].a_w.w_float;
/* 				post("%d",deb++); */
 			}
 			else {
 				post("vbap: Error in loudspeaker data!",0);
 				x->x_lsset_available=0;
 				return;
 			}
 		}
 		if(x->x_dimension == 3){ 
 			for(i=0; i < x->x_dimension*x->x_dimension; i++){
 				if(av[datapointer].a_type == A_FLOAT){
 					x->x_set_matx[setpointer][i]=av[datapointer++].a_w.w_float;
/* 					post("%d",deb++); */
 				}
 				else {
 					post("vbap: Error in loudspeaker data!",0);
 					x->x_lsset_available=0;
 					return;
 				}
 			}
 		}
 	
 		setpointer++;
	}
	post("vbap: Loudspeaker setup configured!",0);
}

void vbap_in1(t_vbap *x, long n)				/* x = the instance of the object, n = the int received in the right inlet */
/* panning angle azimuth */
{
	x->x_azi = n;							/* store n in a global variable */
	
}

void vbap_in2(t_vbap *x, long n)				/* x = the instance of the object, n = the int received in the right inlet */
/* panning angle elevation */
{
	x->x_ele = n;							/* store n in a global variable */

}
/*--------------------------------------------------------------------------*/

void vbap_in3(t_vbap *x, long n)				/* x = the instance of the object, n = the int received in the right inlet */
/* spread amount */
{
	if (n<0) n = 0;
	if (n>100) n = 100;
	x->x_spread = n;							/* store n in a global variable */
	
}


static void *vbap_new(t_symbol *s, int ac, t_atom *av)	
/* create new instance of object... MUST send it an int even if you do nothing with this int!! */
{
	t_vbap *x;
	x = (t_vbap *)pd_new(vbap_class);

/* MAX:	
/*	intin(x,3);	
/*	intin(x,2);					/* create a second (int) inlet... remember right-to-left ordering in Max */
/*	intin(x,1);					/* create a second (int) inlet... remember right-to-left ordering in Max */
/*	x->x_outlet3 = intout(x);
/*	x->x_outlet2 = intout(x);	/* create an (int) outlet  - rightmost outlet first... */
/*	x->x_outlet1 = intout(x);	/* create an (int) outlet */
/*	x->x_outlet0 = listout(x);	/* create a (list) outlet */
/*
/* pure data: */

	floatinlet_new(&x->x_ob, &x->x_azi);
	floatinlet_new(&x->x_ob, &x->x_ele);
	floatinlet_new(&x->x_ob, &x->x_spread);

	x->x_outlet0 = outlet_new(&x->x_ob, gensym("list"));
	x->x_outlet1 = outlet_new(&x->x_ob, gensym("float"));	
	x->x_outlet2 = outlet_new(&x->x_ob, gensym("float"));	
	x->x_outlet3 = outlet_new(&x->x_ob, gensym("float"));	

/* - */

	
	x->x_azi = 0;
	x->x_ele = 0;
	x->x_spread_base[0] = 0.0;
	x->x_spread_base[1] = 1.0;
	x->x_spread_base[2] = 0.0;
	x->x_spread = 0;
	x->x_lsset_available =0;
	if (ac>0) {
/*		if (av[0].a_type == A_LONG)
			x->x_azi = av[0].a_w.w_long;
		else */
		if (av[0].a_type == A_FLOAT)
			x->x_azi = (long)av[0].a_w.w_float;		
	}
	if (ac>1) {
/*		if (av[1].a_type == A_LONG)
			x->x_ele = av[1].a_w.w_long;
		else */
		if (av[1].a_type == A_FLOAT)
			x->x_ele = (long)av[1].a_w.w_float;	
	}
	return(x);					/* return a reference to the object instance */
}