src/cv/bsdfrbf.c

#ifndef lint
static const char RCSid[] = "$Id: bsdfrbf.c,v 2.25 2014/03/30 00:19:09 greg Exp $";
#endif
/*
 * Radial basis function representation for BSDF data.
 *
 *      G. Ward
 */

/****************************************************************
1) Collect samples into a grid using the Shirley-Chiu
        angular mapping from a hemisphere to a square.

2) Compute an adaptive quadtree by subdividing the grid so that
        each leaf node has at least one sample up to as many
        samples as fit nicely on a plane to within a certain
        MSE tolerance.

3) Place one Gaussian lobe at each leaf node in the quadtree,
        sizing it to have a radius equal to the leaf size and
        a volume equal to the energy in that node.
*****************************************************************/

#define _USE_MATH_DEFINES
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "bsdfrep.h"

#ifndef RSCA
#define RSCA            2.0             /* radius scaling factor (empirical) */
#endif
#ifndef SMOOTH_MSE
#define SMOOTH_MSE      5e-5            /* acceptable mean squared error */
#endif
#ifndef SMOOTH_MSER
#define SMOOTH_MSER     0.03            /* acceptable relative MSE */
#endif
#define MAX_RAD         (GRIDRES/8)     /* maximum lobe radius */

#define RBFALLOCB       10              /* RBF allocation block size */

                                        /* loaded grid or comparison DSFs */
GRIDVAL                 dsf_grid[GRIDRES][GRIDRES];

/* Start new DSF input grid */
void
new_bsdf_data(double new_theta, double new_phi)
{
        if (!new_input_direction(new_theta, new_phi))
                exit(1);
        memset(dsf_grid, 0, sizeof(dsf_grid));
}

/* Add BSDF data point */
void
add_bsdf_data(double theta_out, double phi_out, double val, int isDSF)
{
        FVECT   ovec;
        int     pos[2];

        if (!output_orient)             /* check output orientation */
                output_orient = 1 - 2*(theta_out > 90.);
        else if (output_orient > 0 ^ theta_out < 90.) {
                fputs("Cannot handle output angles on both sides of surface\n",
                                stderr);
                exit(1);
        }
        ovec[2] = sin((M_PI/180.)*theta_out);
        ovec[0] = cos((M_PI/180.)*phi_out) * ovec[2];
        ovec[1] = sin((M_PI/180.)*phi_out) * ovec[2];
        ovec[2] = sqrt(1. - ovec[2]*ovec[2]);

        if (!isDSF)
                val *= COSF(ovec[2]);   /* convert from BSDF to DSF */

                                        /* update BSDF histogram */
        if (val < BSDF2BIG*ovec[2] && val > BSDF2SML*ovec[2])
                ++bsdf_hist[histndx(val/ovec[2])];

        pos_from_vec(pos, ovec);

        dsf_grid[pos[0]][pos[1]].sum.v += val;
        dsf_grid[pos[0]][pos[1]].sum.n++;
}

/* Compute minimum BSDF from histogram (does not clear) */
static void
comp_bsdf_min()
{
        unsigned long   cnt, target;
        int             i;

        cnt = 0;
        for (i = HISTLEN; i--; )
                cnt += bsdf_hist[i];
        if (!cnt) {                             /* shouldn't happen */
                bsdf_min = 0;
                return;
        }
        target = cnt/100;                       /* ignore bottom 1% */
        cnt = 0;
        for (i = 0; cnt <= target; i++)
                cnt += bsdf_hist[i];
        bsdf_min = histval(i-1);
}

/* Determine if the given region is empty of grid samples */
static int
empty_region(int x0, int x1, int y0, int y1)
{
        int     x, y;

        for (x = x0; x < x1; x++)
            for (y = y0; y < y1; y++)
                if (dsf_grid[x][y].sum.n)
                        return(0);
        return(1);
}

/* Determine if the given region is smooth enough to be a single lobe */
static int
smooth_region(int x0, int x1, int y0, int y1)
{
        RREAL   rMtx[3][3];
        FVECT   xvec;
        double  A, B, C, nvs, sqerr;
        int     x, y, n;
                                        /* compute planar regression */
        memset(rMtx, 0, sizeof(rMtx));
        memset(xvec, 0, sizeof(xvec));
        for (x = x0; x < x1; x++)
            for (y = y0; y < y1; y++)
                if ((n = dsf_grid[x][y].sum.n) > 0) {
                        double  z = dsf_grid[x][y].sum.v;
                        rMtx[0][0] += x*x*(double)n;
                        rMtx[0][1] += x*y*(double)n;
                        rMtx[0][2] += x*(double)n;
                        rMtx[1][1] += y*y*(double)n;
                        rMtx[1][2] += y*(double)n;
                        rMtx[2][2] += (double)n;
                        xvec[0] += x*z;
                        xvec[1] += y*z;
                        xvec[2] += z;
                }
        rMtx[1][0] = rMtx[0][1];
        rMtx[2][0] = rMtx[0][2];
        rMtx[2][1] = rMtx[1][2];
        nvs = rMtx[2][2];
        if (SDinvXform(rMtx, rMtx) != SDEnone)
                return(1);              /* colinear values */
        A = DOT(rMtx[0], xvec);
        B = DOT(rMtx[1], xvec);
        C = DOT(rMtx[2], xvec);
        sqerr = 0.0;                    /* compute mean squared error */
        for (x = x0; x < x1; x++)
            for (y = y0; y < y1; y++)
                if ((n = dsf_grid[x][y].sum.n) > 0) {
                        double  d = A*x + B*y + C - dsf_grid[x][y].sum.v/n;
                        sqerr += n*d*d;
                }
        if (sqerr <= nvs*SMOOTH_MSE)    /* below absolute MSE threshold? */
                return(1);
                                        /* OR below relative MSE threshold? */
        return(sqerr*nvs <= xvec[2]*xvec[2]*SMOOTH_MSER);
}

/* Create new lobe based on integrated samples in region */
static int
create_lobe(RBFVAL *rvp, int x0, int x1, int y0, int y1)
{
        double  vtot = 0.0;
        int     nv = 0;
        double  wxsum = 0.0, wysum = 0.0, wtsum = 0.0;
        double  rad;
        int     x, y;
                                        /* compute average for region */
        for (x = x0; x < x1; x++)
            for (y = y0; y < y1; y++)
                if (dsf_grid[x][y].sum.n) {
                    const double        v = dsf_grid[x][y].sum.v;
                    const int           n = dsf_grid[x][y].sum.n;

                    if (v > 0) {
                        double  wt = v / (double)n;
                        wxsum += wt * x;
                        wysum += wt * y;
                        wtsum += wt;
                    }
                    vtot += v;
                    nv += n;
                }
        if (!nv) {
                fprintf(stderr, "%s: internal - missing samples in create_lobe\n",
                                progname);
                exit(1);
        }
        if (vtot <= 0)                  /* only create positive lobes */
                return(0);
                                        /* peak value based on integral */
        vtot *= (x1-x0)*(y1-y0)*(2.*M_PI/GRIDRES/GRIDRES)/(double)nv;
        rad = (RSCA/(double)GRIDRES)*(x1-x0);
        rvp->peak =  vtot / ((2.*M_PI) * rad*rad);
        rvp->crad = ANG2R(rad);         /* put peak at centroid */
        rvp->gx = (int)(wxsum/wtsum + .5);
        rvp->gy = (int)(wysum/wtsum + .5);
        return(1);
}

/* Recursive function to build radial basis function representation */
static int
build_rbfrep(RBFVAL **arp, int *np, int x0, int x1, int y0, int y1)
{
        int     xmid = (x0+x1)>>1;
        int     ymid = (y0+y1)>>1;
        int     branched[4];
        int     nadded, nleaves;
                                        /* need to make this a leaf? */
        if (empty_region(x0, xmid, y0, ymid) ||
                        empty_region(xmid, x1, y0, ymid) ||
                        empty_region(x0, xmid, ymid, y1) ||
                        empty_region(xmid, x1, ymid, y1))
                return(0);
                                        /* add children (branches+leaves) */
        if ((branched[0] = build_rbfrep(arp, np, x0, xmid, y0, ymid)) < 0)
                return(-1);
        if ((branched[1] = build_rbfrep(arp, np, xmid, x1, y0, ymid)) < 0)
                return(-1);
        if ((branched[2] = build_rbfrep(arp, np, x0, xmid, ymid, y1)) < 0)
                return(-1);
        if ((branched[3] = build_rbfrep(arp, np, xmid, x1, ymid, y1)) < 0)
                return(-1);
        nadded = branched[0] + branched[1] + branched[2] + branched[3];
        nleaves = !branched[0] + !branched[1] + !branched[2] + !branched[3];
        if (!nleaves)                   /* nothing but branches? */
                return(nadded);
                                        /* combine 4 leaves into 1? */
        if ((nleaves == 4) & (x1-x0 <= MAX_RAD) &&
                        smooth_region(x0, x1, y0, y1))
                return(0);
                                        /* need more array space? */
        if ((*np+nleaves-1)>>RBFALLOCB != (*np-1)>>RBFALLOCB) {
                *arp = (RBFVAL *)realloc(*arp,
                                sizeof(RBFVAL)*(*np+nleaves-1+(1<<RBFALLOCB)));
                if (*arp == NULL)
                        return(-1);
        }
                                        /* create lobes for leaves */
        if (!branched[0] && create_lobe(*arp+*np, x0, xmid, y0, ymid)) {
                ++(*np); ++nadded;
        }
        if (!branched[1] && create_lobe(*arp+*np, xmid, x1, y0, ymid)) {
                ++(*np); ++nadded;
        }
        if (!branched[2] && create_lobe(*arp+*np, x0, xmid, ymid, y1)) {
                ++(*np); ++nadded;
        }
        if (!branched[3] && create_lobe(*arp+*np, xmid, x1, ymid, y1)) {
                ++(*np); ++nadded;
        }
        return(nadded);
}

/* Count up filled nodes and build RBF representation from current grid */ 
RBFNODE *
make_rbfrep()
{
        RBFNODE *newnode;
        RBFVAL  *rbfarr;
        int     nn;
                                /* compute minimum BSDF */
        comp_bsdf_min();
                                /* create RBF node list */
        rbfarr = NULL; nn = 0;
        if (build_rbfrep(&rbfarr, &nn, 0, GRIDRES, 0, GRIDRES) <= 0) {
                if (nn)
                        goto memerr;
                fprintf(stderr,
                        "%s: warning - skipping bad incidence (%.1f,%.1f)\n",
                                progname, theta_in_deg, phi_in_deg);
                return(NULL);
        }
                                /* (re)allocate RBF array */
        newnode = (RBFNODE *)realloc(rbfarr,
                        sizeof(RBFNODE) + sizeof(RBFVAL)*(nn-1));
        if (newnode == NULL)
                goto memerr;
                                /* copy computed lobes into RBF node */
        memmove(newnode->rbfa, newnode, sizeof(RBFVAL)*nn);
        newnode->ord = -1;
        newnode->next = NULL;
        newnode->ejl = NULL;
        newnode->invec[2] = sin((M_PI/180.)*theta_in_deg);
        newnode->invec[0] = cos((M_PI/180.)*phi_in_deg)*newnode->invec[2];
        newnode->invec[1] = sin((M_PI/180.)*phi_in_deg)*newnode->invec[2];
        newnode->invec[2] = input_orient*sqrt(1. - newnode->invec[2]*newnode->invec[2]);
        newnode->vtotal = .0;
        newnode->nrbf = nn;
                                /* compute sum for normalization */
        while (nn-- > 0)
                newnode->vtotal += rbf_volume(&newnode->rbfa[nn]);
#ifdef DEBUG
        fprintf(stderr, "Built RBF with %d lobes\n", newnode->nrbf);
        fprintf(stderr, "Integrated DSF at (%.1f,%.1f) deg. is %.2f\n",
                        get_theta180(newnode->invec), get_phi360(newnode->invec),
                        newnode->vtotal);
#endif
        insert_dsf(newnode);
        return(newnode);
memerr:
        fprintf(stderr, "%s: Out of memory in make_rbfrep()\n", progname);
        exit(1);
}
Revision:	2.26
Committed:	Fri Aug 22 05:38:44 2014 UTC (9 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad4R2P2, rad5R0, rad4R2P1
Changes since 2.25:	+2 -2 lines
Log Message:	Set minimum cosine to 0.02 to avoid blowing-up values near grazing
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.26	static const char RCSid[] = "$Id: bsdfrbf.c,v 2.25 2014/03/30 00:19:09 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* Radial basis function representation for BSDF data.
6			*
7			* G. Ward
8			*/
9
10	greg	2.13	/****************************************************************
11			1) Collect samples into a grid using the Shirley-Chiu
12			angular mapping from a hemisphere to a square.
13
14			2) Compute an adaptive quadtree by subdividing the grid so that
15			each leaf node has at least one sample up to as many
16			samples as fit nicely on a plane to within a certain
17			MSE tolerance.
18
19			3) Place one Gaussian lobe at each leaf node in the quadtree,
20			sizing it to have a radius equal to the leaf size and
21			a volume equal to the energy in that node.
22			*****************************************************************/
23
24	greg	2.1	#define _USE_MATH_DEFINES
25			#include <stdio.h>
26			#include <stdlib.h>
27			#include <string.h>
28			#include <math.h>
29			#include "bsdfrep.h"
30
31	greg	2.12	#ifndef RSCA
32	greg	2.25	#define RSCA 2.0 /* radius scaling factor (empirical) */
33	greg	2.9	#endif
34	greg	2.12	#ifndef SMOOTH_MSE
35	greg	2.19	#define SMOOTH_MSE 5e-5 /* acceptable mean squared error */
36	greg	2.1	#endif
37	greg	2.12	#ifndef SMOOTH_MSER
38	greg	2.18	#define SMOOTH_MSER 0.03 /* acceptable relative MSE */
39	greg	2.7	#endif
40	greg	2.12	#define MAX_RAD (GRIDRES/8) /* maximum lobe radius */
41
42			#define RBFALLOCB 10 /* RBF allocation block size */
43
44	greg	2.25	/* loaded grid or comparison DSFs */
45	greg	2.1	GRIDVAL dsf_grid[GRIDRES][GRIDRES];
46
47			/* Start new DSF input grid */
48			void
49			new_bsdf_data(double new_theta, double new_phi)
50			{
51			if (!new_input_direction(new_theta, new_phi))
52			exit(1);
53			memset(dsf_grid, 0, sizeof(dsf_grid));
54			}
55
56			/* Add BSDF data point */
57			void
58			add_bsdf_data(double theta_out, double phi_out, double val, int isDSF)
59			{
60			FVECT ovec;
61			int pos[2];
62
63			if (!output_orient) /* check output orientation */
64			output_orient = 1 - 2*(theta_out > 90.);
65			else if (output_orient > 0 ^ theta_out < 90.) {
66			fputs("Cannot handle output angles on both sides of surface\n",
67			stderr);
68			exit(1);
69			}
70			ovec[2] = sin((M_PI/180.)*theta_out);
71			ovec[0] = cos((M_PI/180.)phi_out) ovec[2];
72			ovec[1] = sin((M_PI/180.)phi_out) ovec[2];
73			ovec[2] = sqrt(1. - ovec[2]*ovec[2]);
74
75	greg	2.21	if (!isDSF)
76	greg	2.26	val = COSF(ovec[2]); / convert from BSDF to DSF */
77	greg	2.1
78	greg	2.4	/* update BSDF histogram */
79			if (val < BSDF2BIGovec[2] && val > BSDF2SMLovec[2])
80			++bsdf_hist[histndx(val/ovec[2])];
81
82	greg	2.1	pos_from_vec(pos, ovec);
83
84	greg	2.20	dsf_grid[pos[0]][pos[1]].sum.v += val;
85			dsf_grid[pos[0]][pos[1]].sum.n++;
86	greg	2.1	}
87
88	greg	2.11	/* Compute minimum BSDF from histogram (does not clear) */
89	greg	2.5	static void
90			comp_bsdf_min()
91			{
92	greg	2.17	unsigned long cnt, target;
93			int i;
94	greg	2.5
95			cnt = 0;
96			for (i = HISTLEN; i--; )
97			cnt += bsdf_hist[i];
98			if (!cnt) { /* shouldn't happen */
99			bsdf_min = 0;
100			return;
101			}
102			target = cnt/100; /* ignore bottom 1% */
103			cnt = 0;
104			for (i = 0; cnt <= target; i++)
105			cnt += bsdf_hist[i];
106			bsdf_min = histval(i-1);
107			}
108
109	greg	2.12	/* Determine if the given region is empty of grid samples */
110	greg	2.6	static int
111	greg	2.12	empty_region(int x0, int x1, int y0, int y1)
112	greg	2.6	{
113	greg	2.12	int x, y;
114
115			for (x = x0; x < x1; x++)
116			for (y = y0; y < y1; y++)
117	greg	2.20	if (dsf_grid[x][y].sum.n)
118	greg	2.12	return(0);
119			return(1);
120			}
121
122			/* Determine if the given region is smooth enough to be a single lobe */
123			static int
124			smooth_region(int x0, int x1, int y0, int y1)
125			{
126			RREAL rMtx[3][3];
127			FVECT xvec;
128			double A, B, C, nvs, sqerr;
129			int x, y, n;
130			/* compute planar regression */
131			memset(rMtx, 0, sizeof(rMtx));
132			memset(xvec, 0, sizeof(xvec));
133			for (x = x0; x < x1; x++)
134			for (y = y0; y < y1; y++)
135	greg	2.20	if ((n = dsf_grid[x][y].sum.n) > 0) {
136			double z = dsf_grid[x][y].sum.v;
137	greg	2.13	rMtx[0][0] += xx(double)n;
138			rMtx[0][1] += xy(double)n;
139			rMtx[0][2] += x*(double)n;
140			rMtx[1][1] += yy(double)n;
141			rMtx[1][2] += y*(double)n;
142			rMtx[2][2] += (double)n;
143	greg	2.12	xvec[0] += x*z;
144			xvec[1] += y*z;
145			xvec[2] += z;
146			}
147			rMtx[1][0] = rMtx[0][1];
148	greg	2.15	rMtx[2][0] = rMtx[0][2];
149	greg	2.12	rMtx[2][1] = rMtx[1][2];
150			nvs = rMtx[2][2];
151			if (SDinvXform(rMtx, rMtx) != SDEnone)
152	greg	2.16	return(1); /* colinear values */
153	greg	2.12	A = DOT(rMtx[0], xvec);
154			B = DOT(rMtx[1], xvec);
155			C = DOT(rMtx[2], xvec);
156			sqerr = 0.0; /* compute mean squared error */
157			for (x = x0; x < x1; x++)
158			for (y = y0; y < y1; y++)
159	greg	2.20	if ((n = dsf_grid[x][y].sum.n) > 0) {
160			double d = Ax + By + C - dsf_grid[x][y].sum.v/n;
161	greg	2.12	sqerr += ndd;
162	greg	2.6	}
163	greg	2.12	if (sqerr <= nvsSMOOTH_MSE) / below absolute MSE threshold? */
164			return(1);
165	greg	2.13	/* OR below relative MSE threshold? */
166	greg	2.12	return(sqerrnvs <= xvec[2]xvec[2]*SMOOTH_MSER);
167			}
168
169			/* Create new lobe based on integrated samples in region */
170	greg	2.21	static int
171	greg	2.12	create_lobe(RBFVAL *rvp, int x0, int x1, int y0, int y1)
172			{
173			double vtot = 0.0;
174			int nv = 0;
175	greg	2.25	double wxsum = 0.0, wysum = 0.0, wtsum = 0.0;
176	greg	2.12	double rad;
177			int x, y;
178			/* compute average for region */
179			for (x = x0; x < x1; x++)
180	greg	2.25	for (y = y0; y < y1; y++)
181			if (dsf_grid[x][y].sum.n) {
182			const double v = dsf_grid[x][y].sum.v;
183			const int n = dsf_grid[x][y].sum.n;
184
185			if (v > 0) {
186			double wt = v / (double)n;
187			wxsum += wt * x;
188			wysum += wt * y;
189			wtsum += wt;
190			}
191			vtot += v;
192			nv += n;
193			}
194	greg	2.12	if (!nv) {
195			fprintf(stderr, "%s: internal - missing samples in create_lobe\n",
196			progname);
197			exit(1);
198	greg	2.6	}
199	greg	2.21	if (vtot <= 0) /* only create positive lobes */
200			return(0);
201	greg	2.12	/* peak value based on integral */
202			vtot = (x1-x0)(y1-y0)(2.M_PI/GRIDRES/GRIDRES)/(double)nv;
203			rad = (RSCA/(double)GRIDRES)*(x1-x0);
204			rvp->peak = vtot / ((2.M_PI) rad*rad);
205	greg	2.25	rvp->crad = ANG2R(rad); /* put peak at centroid */
206			rvp->gx = (int)(wxsum/wtsum + .5);
207			rvp->gy = (int)(wysum/wtsum + .5);
208	greg	2.21	return(1);
209	greg	2.6	}
210
211	greg	2.12	/* Recursive function to build radial basis function representation */
212	greg	2.6	static int
213	greg	2.12	build_rbfrep(RBFVAL *arp, int np, int x0, int x1, int y0, int y1)
214	greg	2.6	{
215	greg	2.12	int xmid = (x0+x1)>>1;
216			int ymid = (y0+y1)>>1;
217			int branched[4];
218			int nadded, nleaves;
219			/* need to make this a leaf? */
220			if (empty_region(x0, xmid, y0, ymid) \|\|
221			empty_region(xmid, x1, y0, ymid) \|\|
222			empty_region(x0, xmid, ymid, y1) \|\|
223			empty_region(xmid, x1, ymid, y1))
224			return(0);
225			/* add children (branches+leaves) */
226			if ((branched[0] = build_rbfrep(arp, np, x0, xmid, y0, ymid)) < 0)
227			return(-1);
228			if ((branched[1] = build_rbfrep(arp, np, xmid, x1, y0, ymid)) < 0)
229			return(-1);
230			if ((branched[2] = build_rbfrep(arp, np, x0, xmid, ymid, y1)) < 0)
231			return(-1);
232			if ((branched[3] = build_rbfrep(arp, np, xmid, x1, ymid, y1)) < 0)
233			return(-1);
234			nadded = branched[0] + branched[1] + branched[2] + branched[3];
235			nleaves = !branched[0] + !branched[1] + !branched[2] + !branched[3];
236			if (!nleaves) /* nothing but branches? */
237			return(nadded);
238			/* combine 4 leaves into 1? */
239	greg	2.14	if ((nleaves == 4) & (x1-x0 <= MAX_RAD) &&
240			smooth_region(x0, x1, y0, y1))
241	greg	2.12	return(0);
242			/* need more array space? */
243			if ((np+nleaves-1)>>RBFALLOCB != (np-1)>>RBFALLOCB) {
244			arp = (RBFVAL )realloc(*arp,
245			sizeof(RBFVAL)(np+nleaves-1+(1<<RBFALLOCB)));
246			if (*arp == NULL)
247			return(-1);
248	greg	2.6	}
249	greg	2.12	/* create lobes for leaves */
250	greg	2.21	if (!branched[0] && create_lobe(arp+np, x0, xmid, y0, ymid)) {
251			++(*np); ++nadded;
252			}
253			if (!branched[1] && create_lobe(arp+np, xmid, x1, y0, ymid)) {
254			++(*np); ++nadded;
255			}
256			if (!branched[2] && create_lobe(arp+np, x0, xmid, ymid, y1)) {
257			++(*np); ++nadded;
258			}
259			if (!branched[3] && create_lobe(arp+np, xmid, x1, ymid, y1)) {
260			++(*np); ++nadded;
261			}
262	greg	2.12	return(nadded);
263	greg	2.6	}
264
265	greg	2.1	/* Count up filled nodes and build RBF representation from current grid */
266			RBFNODE *
267	greg	2.12	make_rbfrep()
268	greg	2.1	{
269	greg	2.12	RBFNODE *newnode;
270			RBFVAL *rbfarr;
271	greg	2.1	int nn;
272	greg	2.5	/* compute minimum BSDF */
273			comp_bsdf_min();
274	greg	2.12	/* create RBF node list */
275			rbfarr = NULL; nn = 0;
276	greg	2.22	if (build_rbfrep(&rbfarr, &nn, 0, GRIDRES, 0, GRIDRES) <= 0) {
277			if (nn)
278			goto memerr;
279	greg	2.24	fprintf(stderr,
280			"%s: warning - skipping bad incidence (%.1f,%.1f)\n",
281			progname, theta_in_deg, phi_in_deg);
282			return(NULL);
283	greg	2.22	}
284	greg	2.12	/* (re)allocate RBF array */
285			newnode = (RBFNODE *)realloc(rbfarr,
286			sizeof(RBFNODE) + sizeof(RBFVAL)*(nn-1));
287	greg	2.2	if (newnode == NULL)
288			goto memerr;
289	greg	2.12	/* copy computed lobes into RBF node */
290			memmove(newnode->rbfa, newnode, sizeof(RBFVAL)*nn);
291	greg	2.1	newnode->ord = -1;
292			newnode->next = NULL;
293			newnode->ejl = NULL;
294			newnode->invec[2] = sin((M_PI/180.)*theta_in_deg);
295			newnode->invec[0] = cos((M_PI/180.)phi_in_deg)newnode->invec[2];
296			newnode->invec[1] = sin((M_PI/180.)phi_in_deg)newnode->invec[2];
297			newnode->invec[2] = input_orientsqrt(1. - newnode->invec[2]newnode->invec[2]);
298	greg	2.12	newnode->vtotal = .0;
299	greg	2.1	newnode->nrbf = nn;
300	greg	2.12	/* compute sum for normalization */
301			while (nn-- > 0)
302			newnode->vtotal += rbf_volume(&newnode->rbfa[nn]);
303	greg	2.3	#ifdef DEBUG
304	greg	2.12	fprintf(stderr, "Built RBF with %d lobes\n", newnode->nrbf);
305	greg	2.3	fprintf(stderr, "Integrated DSF at (%.1f,%.1f) deg. is %.2f\n",
306			get_theta180(newnode->invec), get_phi360(newnode->invec),
307			newnode->vtotal);
308			#endif
309	greg	2.1	insert_dsf(newnode);
310			return(newnode);
311	greg	2.2	memerr:
312			fprintf(stderr, "%s: Out of memory in make_rbfrep()\n", progname);
313			exit(1);
314	greg	2.1	}