src/cv/bsdfrep.h

/* RCSid $Id: bsdfrep.h,v 2.2 2012/10/20 07:02:00 greg Exp $ */
/*
 * Definitions for BSDF representation used to interpolate measured data.
 *
 *      G. Ward
 */

#include "bsdf.h"

#define DEBUG           1

#ifndef GRIDRES
#define GRIDRES         200             /* grid resolution per side */
#endif
                                        /* convert to/from coded radians */
#define ANG2R(r)        (int)((r)*((1<<16)/M_PI))
#define R2ANG(c)        (((c)+.5)*(M_PI/(1<<16)))

typedef struct {
        float           vsum;           /* DSF sum */
        unsigned short  nval;           /* number of values in sum */
        unsigned short  crad;           /* radius (coded angle) */
} GRIDVAL;                      /* grid value */

typedef struct {
        float           peak;           /* lobe value at peak */
        unsigned short  crad;           /* radius (coded angle) */
        unsigned char   gx, gy;         /* grid position */
} RBFVAL;                       /* radial basis function value */

struct s_rbfnode;               /* forward declaration of RBF struct */

typedef struct s_migration {
        struct s_migration      *next;          /* next in global edge list */
        struct s_rbfnode        *rbfv[2];       /* from,to vertex */
        struct s_migration      *enxt[2];       /* next from,to sibling */
        float                   mtx[1];         /* matrix (extends struct) */
} MIGRATION;                    /* migration link (winged edge structure) */

typedef struct s_rbfnode {
        int                     ord;            /* ordinal position in list */
        struct s_rbfnode        *next;          /* next in global RBF list */
        MIGRATION               *ejl;           /* edge list for this vertex */
        FVECT                   invec;          /* incident vector direction */
        double                  vtotal;         /* volume for normalization */
        int                     nrbf;           /* number of RBFs */
        RBFVAL                  rbfa[1];        /* RBF array (extends struct) */
} RBFNODE;                      /* RBF representation of DSF @ 1 incidence */

                                /* symmetry operations */
#define MIRROR_X        1               /* mirror(ed) x-coordinate */
#define MIRROR_Y        2               /* mirror(ed) y-coordinate */

                                /* represented incident quadrants */
#define INP_QUAD1       1               /* 0-90 degree quadrant */
#define INP_QUAD2       2               /* 90-180 degree quadrant */
#define INP_QUAD3       4               /* 180-270 degree quadrant */
#define INP_QUAD4       8               /* 270-360 degree quadrant */

                                /* coverage/symmetry using INP_QUAD? flags */
extern int              inp_coverage;

                                /* all incident angles in-plane so far? */
extern int              single_plane_incident;

                                /* input/output orientations */
extern int              input_orient;
extern int              output_orient;

                                /* processed incident DSF measurements */
extern RBFNODE          *dsf_list;

                                /* RBF-linking matrices (edges) */
extern MIGRATION        *mig_list;

#define mtx_nrows(m)    (m)->rbfv[0]->nrbf
#define mtx_ncols(m)    (m)->rbfv[1]->nrbf
#define mtx_coef(m,i,j) (m)->mtx[(i)*mtx_ncols(m) + (j)]
#define is_src(rbf,m)   ((rbf) == (m)->rbfv[0])
#define is_dest(rbf,m)  ((rbf) == (m)->rbfv[1])
#define nextedge(rbf,m) (m)->enxt[is_dest(rbf,m)]
#define opp_rbf(rbf,m)  (m)->rbfv[is_src(rbf,m)]

#define round(v)        (int)((v) + .5 - ((v) < -.5))

#define BSDFREP_FMT     "BSDF_RBFmesh"

                                /* global argv[0] */
extern char             *progname;

                                /* get theta value in degrees [0,180) range */
#define get_theta180(v) ((180./M_PI)*acos((v)[2]))
                                /* get phi value in degrees, [0,360) range */
#define get_phi360(v)   ((180./M_PI)*atan2((v)[1],(v)[0]) + 180.)

                                /* our loaded grid for this incident angle */
extern double           theta_in_deg, phi_in_deg;
extern GRIDVAL          dsf_grid[GRIDRES][GRIDRES];

/* Register new input direction */
extern int              new_input_direction(double new_theta, double new_phi);

#define new_input_vector(v)\
                        new_input_direction(get_theta180(v),get_phi360(v))

/* Apply symmetry to the given vector based on distribution */
extern int              use_symmetry(FVECT vec);

/* Reverse symmetry based on what was done before */
extern void             rev_symmetry(FVECT vec, int sym);

/* Reverse symmetry for an RBF distribution */
extern void             rev_rbf_symmetry(RBFNODE *rbf, int sym);

/* Compute volume associated with Gaussian lobe */
extern double           rbf_volume(const RBFVAL *rbfp);

/* Compute outgoing vector from grid position */
extern void             ovec_from_pos(FVECT vec, int xpos, int ypos);

/* Compute grid position from normalized input/output vector */
extern void             pos_from_vec(int pos[2], const FVECT vec);

/* Evaluate RBF for DSF at the given normalized outgoing direction */
extern double           eval_rbfrep(const RBFNODE *rp, const FVECT outvec);

/* Insert a new directional scattering function in our global list */
extern int              insert_dsf(RBFNODE *newrbf);

/* Get the DSF indicated by its ordinal position */
extern RBFNODE *        get_dsf(int ord);

/* Get triangle surface orientation (unnormalized) */
extern void             tri_orient(FVECT vres, const FVECT v1,
                                        const FVECT v2, const FVECT v3);

/* Determine if vertex order is reversed (inward normal) */
extern int              is_rev_tri(const FVECT v1,
                                        const FVECT v2, const FVECT v3);

/* Find vertices completing triangles on either side of the given edge */
extern int              get_triangles(RBFNODE *rbfv[2], const MIGRATION *mig);

/* Clear our BSDF representation and free memory */
extern void             clear_bsdf_rep(void);

/* Write our BSDF mesh interpolant out to the given binary stream */
extern void             save_bsdf_rep(FILE *ofp);

/* Read a BSDF mesh interpolant from the given binary stream */
extern int              load_bsdf_rep(FILE *ifp);

/* Start new DSF input grid */
extern void             new_bsdf_data(double new_theta, double new_phi);

/* Add BSDF data point */
extern void             add_bsdf_data(double theta_out, double phi_out,
                                        double val, int isDSF);

/* Count up filled nodes and build RBF representation from current grid */ 
extern RBFNODE *        make_rbfrep(void);

/* Build our triangle mesh from recorded RBFs */
extern void             build_mesh(void);

/* Find edge(s) for interpolating the given vector, applying symmetry */
extern int              get_interp(MIGRATION *miga[3], FVECT invec);

/* Partially advect between recorded incident angles and allocate new RBF */
extern RBFNODE *        advect_rbf(const FVECT invec);
Revision:	2.3
Committed:	Tue Oct 23 05:10:42 2012 UTC (11 years, 6 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.2:	+8 -10 lines
Log Message:	Hopeful bug fix in BSDF interpolation code
#	User	Rev	Content
1	greg	2.3	/* RCSid $Id: bsdfrep.h,v 2.2 2012/10/20 07:02:00 greg Exp $ */
2	greg	2.1	/*
3			* Definitions for BSDF representation used to interpolate measured data.
4			*
5			* G. Ward
6			*/
7
8			#include "bsdf.h"
9
10			#define DEBUG 1
11
12			#ifndef GRIDRES
13			#define GRIDRES 200 /* grid resolution per side */
14			#endif
15			/* convert to/from coded radians */
16			#define ANG2R(r) (int)((r)*((1<<16)/M_PI))
17			#define R2ANG(c) (((c)+.5)*(M_PI/(1<<16)))
18
19			typedef struct {
20			float vsum; /* DSF sum */
21			unsigned short nval; /* number of values in sum */
22			unsigned short crad; /* radius (coded angle) */
23			} GRIDVAL; /* grid value */
24
25			typedef struct {
26			float peak; /* lobe value at peak */
27			unsigned short crad; /* radius (coded angle) */
28			unsigned char gx, gy; /* grid position */
29			} RBFVAL; /* radial basis function value */
30
31			struct s_rbfnode; /* forward declaration of RBF struct */
32
33			typedef struct s_migration {
34			struct s_migration next; / next in global edge list */
35			struct s_rbfnode rbfv[2]; / from,to vertex */
36			struct s_migration enxt[2]; / next from,to sibling */
37			float mtx[1]; /* matrix (extends struct) */
38			} MIGRATION; /* migration link (winged edge structure) */
39
40			typedef struct s_rbfnode {
41			int ord; /* ordinal position in list */
42			struct s_rbfnode next; / next in global RBF list */
43			MIGRATION ejl; / edge list for this vertex */
44			FVECT invec; /* incident vector direction */
45			double vtotal; /* volume for normalization */
46			int nrbf; /* number of RBFs */
47			RBFVAL rbfa[1]; /* RBF array (extends struct) */
48			} RBFNODE; /* RBF representation of DSF @ 1 incidence */
49
50			/* symmetry operations */
51			#define MIRROR_X 1 /* mirror(ed) x-coordinate */
52			#define MIRROR_Y 2 /* mirror(ed) y-coordinate */
53
54			/* represented incident quadrants */
55			#define INP_QUAD1 1 /* 0-90 degree quadrant */
56			#define INP_QUAD2 2 /* 90-180 degree quadrant */
57			#define INP_QUAD3 4 /* 180-270 degree quadrant */
58			#define INP_QUAD4 8 /* 270-360 degree quadrant */
59
60	greg	2.3	/* coverage/symmetry using INP_QUAD? flags */
61	greg	2.1	extern int inp_coverage;
62
63			/* all incident angles in-plane so far? */
64			extern int single_plane_incident;
65
66			/* input/output orientations */
67			extern int input_orient;
68			extern int output_orient;
69
70			/* processed incident DSF measurements */
71			extern RBFNODE *dsf_list;
72
73			/* RBF-linking matrices (edges) */
74			extern MIGRATION *mig_list;
75
76	greg	2.3	#define mtx_nrows(m) (m)->rbfv[0]->nrbf
77			#define mtx_ncols(m) (m)->rbfv[1]->nrbf
78	greg	2.2	#define mtx_coef(m,i,j) (m)->mtx[(i)*mtx_ncols(m) + (j)]
79	greg	2.1	#define is_src(rbf,m) ((rbf) == (m)->rbfv[0])
80			#define is_dest(rbf,m) ((rbf) == (m)->rbfv[1])
81			#define nextedge(rbf,m) (m)->enxt[is_dest(rbf,m)]
82			#define opp_rbf(rbf,m) (m)->rbfv[is_src(rbf,m)]
83
84			#define round(v) (int)((v) + .5 - ((v) < -.5))
85
86	greg	2.2	#define BSDFREP_FMT "BSDF_RBFmesh"
87	greg	2.1
88			/* global argv[0] */
89			extern char *progname;
90
91			/* get theta value in degrees [0,180) range */
92	greg	2.3	#define get_theta180(v) ((180./M_PI)*acos((v)[2]))
93	greg	2.1	/* get phi value in degrees, [0,360) range */
94			#define get_phi360(v) ((180./M_PI)*atan2((v)[1],(v)[0]) + 180.)
95
96			/* our loaded grid for this incident angle */
97			extern double theta_in_deg, phi_in_deg;
98			extern GRIDVAL dsf_grid[GRIDRES][GRIDRES];
99
100			/* Register new input direction */
101			extern int new_input_direction(double new_theta, double new_phi);
102
103			#define new_input_vector(v)\
104			new_input_direction(get_theta180(v),get_phi360(v))
105
106			/* Apply symmetry to the given vector based on distribution */
107			extern int use_symmetry(FVECT vec);
108
109			/* Reverse symmetry based on what was done before */
110			extern void rev_symmetry(FVECT vec, int sym);
111
112			/* Reverse symmetry for an RBF distribution */
113			extern void rev_rbf_symmetry(RBFNODE *rbf, int sym);
114
115			/* Compute volume associated with Gaussian lobe */
116			extern double rbf_volume(const RBFVAL *rbfp);
117
118			/* Compute outgoing vector from grid position */
119			extern void ovec_from_pos(FVECT vec, int xpos, int ypos);
120
121			/* Compute grid position from normalized input/output vector */
122			extern void pos_from_vec(int pos[2], const FVECT vec);
123
124			/* Evaluate RBF for DSF at the given normalized outgoing direction */
125			extern double eval_rbfrep(const RBFNODE *rp, const FVECT outvec);
126
127			/* Insert a new directional scattering function in our global list */
128			extern int insert_dsf(RBFNODE *newrbf);
129
130			/* Get the DSF indicated by its ordinal position */
131			extern RBFNODE * get_dsf(int ord);
132
133			/* Get triangle surface orientation (unnormalized) */
134			extern void tri_orient(FVECT vres, const FVECT v1,
135			const FVECT v2, const FVECT v3);
136
137			/* Determine if vertex order is reversed (inward normal) */
138			extern int is_rev_tri(const FVECT v1,
139			const FVECT v2, const FVECT v3);
140
141			/* Find vertices completing triangles on either side of the given edge */
142			extern int get_triangles(RBFNODE rbfv[2], const MIGRATION mig);
143
144	greg	2.3	/* Clear our BSDF representation and free memory */
145			extern void clear_bsdf_rep(void);
146
147	greg	2.1	/* Write our BSDF mesh interpolant out to the given binary stream */
148			extern void save_bsdf_rep(FILE *ofp);
149
150			/* Read a BSDF mesh interpolant from the given binary stream */
151			extern int load_bsdf_rep(FILE *ifp);
152
153			/* Start new DSF input grid */
154			extern void new_bsdf_data(double new_theta, double new_phi);
155
156			/* Add BSDF data point */
157			extern void add_bsdf_data(double theta_out, double phi_out,
158			double val, int isDSF);
159
160			/* Count up filled nodes and build RBF representation from current grid */
161			extern RBFNODE * make_rbfrep(void);
162
163			/* Build our triangle mesh from recorded RBFs */
164			extern void build_mesh(void);
165
166			/* Find edge(s) for interpolating the given vector, applying symmetry */
167			extern int get_interp(MIGRATION *miga[3], FVECT invec);
168
169			/* Partially advect between recorded incident angles and allocate new RBF */
170			extern RBFNODE * advect_rbf(const FVECT invec);