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greg |
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/* RCSid $Id$ */
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/*
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* Definitions for BSDF representation used to interpolate measured data.
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*
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* G. Ward
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*/
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#include "bsdf.h"
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#define DEBUG 1
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#ifndef GRIDRES
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#define GRIDRES 200 /* grid resolution per side */
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#endif
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/* convert to/from coded radians */
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#define ANG2R(r) (int)((r)*((1<<16)/M_PI))
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#define R2ANG(c) (((c)+.5)*(M_PI/(1<<16)))
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typedef struct {
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float vsum; /* DSF sum */
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unsigned short nval; /* number of values in sum */
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unsigned short crad; /* radius (coded angle) */
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} GRIDVAL; /* grid value */
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typedef struct {
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float peak; /* lobe value at peak */
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unsigned short crad; /* radius (coded angle) */
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unsigned char gx, gy; /* grid position */
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} RBFVAL; /* radial basis function value */
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struct s_rbfnode; /* forward declaration of RBF struct */
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typedef struct s_migration {
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struct s_migration *next; /* next in global edge list */
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struct s_rbfnode *rbfv[2]; /* from,to vertex */
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struct s_migration *enxt[2]; /* next from,to sibling */
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float mtx[1]; /* matrix (extends struct) */
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} MIGRATION; /* migration link (winged edge structure) */
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typedef struct s_rbfnode {
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int ord; /* ordinal position in list */
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struct s_rbfnode *next; /* next in global RBF list */
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MIGRATION *ejl; /* edge list for this vertex */
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FVECT invec; /* incident vector direction */
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double vtotal; /* volume for normalization */
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int nrbf; /* number of RBFs */
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RBFVAL rbfa[1]; /* RBF array (extends struct) */
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} RBFNODE; /* RBF representation of DSF @ 1 incidence */
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/* symmetry operations */
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#define MIRROR_X 1 /* mirror(ed) x-coordinate */
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#define MIRROR_Y 2 /* mirror(ed) y-coordinate */
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/* represented incident quadrants */
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#define INP_QUAD1 1 /* 0-90 degree quadrant */
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#define INP_QUAD2 2 /* 90-180 degree quadrant */
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#define INP_QUAD3 4 /* 180-270 degree quadrant */
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#define INP_QUAD4 8 /* 270-360 degree quadrant */
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extern int inp_coverage;
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/* all incident angles in-plane so far? */
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extern int single_plane_incident;
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/* input/output orientations */
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extern int input_orient;
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extern int output_orient;
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/* processed incident DSF measurements */
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extern RBFNODE *dsf_list;
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/* RBF-linking matrices (edges) */
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extern MIGRATION *mig_list;
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/* migration edges drawn in raster fashion */
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extern MIGRATION *mig_grid[GRIDRES][GRIDRES];
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#define mtx_nrows(m) ((m)->rbfv[0]->nrbf)
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#define mtx_ncols(m) ((m)->rbfv[1]->nrbf)
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#define mtx_ndx(m,i,j) ((i)*mtx_ncols(m) + (j))
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#define is_src(rbf,m) ((rbf) == (m)->rbfv[0])
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#define is_dest(rbf,m) ((rbf) == (m)->rbfv[1])
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#define nextedge(rbf,m) (m)->enxt[is_dest(rbf,m)]
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#define opp_rbf(rbf,m) (m)->rbfv[is_src(rbf,m)]
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#define round(v) (int)((v) + .5 - ((v) < -.5))
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#define BSDFREP_FMT "binary_RBF_BSDF_mesh"
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/* global argv[0] */
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extern char *progname;
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/* get theta value in degrees [0,180) range */
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#define get_theta180(v) (180./M_PI)*acos((v)[2])
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/* get phi value in degrees, [0,360) range */
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#define get_phi360(v) ((180./M_PI)*atan2((v)[1],(v)[0]) + 180.)
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/* our loaded grid for this incident angle */
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extern double theta_in_deg, phi_in_deg;
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extern GRIDVAL dsf_grid[GRIDRES][GRIDRES];
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/* Register new input direction */
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extern int new_input_direction(double new_theta, double new_phi);
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#define new_input_vector(v)\
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new_input_direction(get_theta180(v),get_phi360(v))
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/* Apply symmetry to the given vector based on distribution */
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extern int use_symmetry(FVECT vec);
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/* Reverse symmetry based on what was done before */
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extern void rev_symmetry(FVECT vec, int sym);
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/* Reverse symmetry for an RBF distribution */
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extern void rev_rbf_symmetry(RBFNODE *rbf, int sym);
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/* Compute volume associated with Gaussian lobe */
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extern double rbf_volume(const RBFVAL *rbfp);
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/* Compute outgoing vector from grid position */
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extern void ovec_from_pos(FVECT vec, int xpos, int ypos);
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/* Compute grid position from normalized input/output vector */
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extern void pos_from_vec(int pos[2], const FVECT vec);
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/* Evaluate RBF for DSF at the given normalized outgoing direction */
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extern double eval_rbfrep(const RBFNODE *rp, const FVECT outvec);
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/* Insert a new directional scattering function in our global list */
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extern int insert_dsf(RBFNODE *newrbf);
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/* Get the DSF indicated by its ordinal position */
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extern RBFNODE * get_dsf(int ord);
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/* Get triangle surface orientation (unnormalized) */
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extern void tri_orient(FVECT vres, const FVECT v1,
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const FVECT v2, const FVECT v3);
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/* Determine if vertex order is reversed (inward normal) */
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extern int is_rev_tri(const FVECT v1,
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const FVECT v2, const FVECT v3);
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/* Find vertices completing triangles on either side of the given edge */
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extern int get_triangles(RBFNODE *rbfv[2], const MIGRATION *mig);
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/* Write our BSDF mesh interpolant out to the given binary stream */
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extern void save_bsdf_rep(FILE *ofp);
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/* Read a BSDF mesh interpolant from the given binary stream */
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extern int load_bsdf_rep(FILE *ifp);
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/* Start new DSF input grid */
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extern void new_bsdf_data(double new_theta, double new_phi);
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/* Add BSDF data point */
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extern void add_bsdf_data(double theta_out, double phi_out,
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double val, int isDSF);
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/* Count up filled nodes and build RBF representation from current grid */
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extern RBFNODE * make_rbfrep(void);
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/* Build our triangle mesh from recorded RBFs */
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extern void build_mesh(void);
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/* Draw edge list into mig_grid array */
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extern void draw_edges(void);
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/* Find edge(s) for interpolating the given vector, applying symmetry */
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extern int get_interp(MIGRATION *miga[3], FVECT invec);
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/* Partially advect between recorded incident angles and allocate new RBF */
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extern RBFNODE * advect_rbf(const FVECT invec);
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