src/ot/obj2mesh.c

#ifndef lint
static const char RCSid[] = "$Id: obj2mesh.c,v 2.17 2023/02/06 22:40:21 greg Exp $";
#endif
/*
 *  Main program to compile a Wavefront .OBJ file into a Radiance mesh
 */

#include "copyright.h"
#include "paths.h"
#include "platform.h"
#include "standard.h"
#include "resolu.h"
#include "cvmesh.h"
#include "otypes.h"

extern int      o_face(); /* XXX should go to a header file */

int     o_default() { return(O_MISS); }

FUN  ofun[NUMOTYPE] = INIT_OTYPE;       /* needed for link resolution */

int  nowarn = 0;                        /* supress warnings? */

int  objlim = 9;                        /* # of objects before split */

int  resolu = 16384;                    /* octree resolution limit */

double  mincusize;                      /* minimum cube size from resolu */

static void addface(CUBE  *cu, OBJECT   obj);
static void add2full(CUBE  *cu, OBJECT  obj);


int
main(           /* compile a .OBJ file into a mesh */
        int  argc,
        char  *argv[]
)
{
        int  verbose = 0;
        char  *cp;
        int  i, j;

        fixargv0(argv[0]);              /* sets global progname */

        ofun[OBJ_FACE].funp = o_face;

        for (i = 1; i < argc && argv[i][0] == '-'; i++)
                switch (argv[i][1]) {
                case 'n':                               /* set limit */
                        objlim = atoi(argv[++i]);
                        break;
                case 'r':                               /* resolution limit */
                        resolu = atoi(argv[++i]);
                        break;
                case 'a':                               /* material file */
                        readobj(argv[++i]);
                        break;
                case 'l':                               /* library material */
                        cp = getpath(argv[++i], getrlibpath(), R_OK);
                        if (cp == NULL) {
                                sprintf(errmsg,
                                        "cannot find library material: '%s'",
                                                argv[i]);
                                error(SYSTEM, errmsg);
                        }
                        readobj(cp);
                        break;
                case 'w':                               /* supress warnings */
                        nowarn = 1;
                        break;
                case 'v':                               /* print mesh stats */
                        verbose = 1;
                        break;
                default:
                        sprintf(errmsg, "unknown option: '%s'", argv[i]);
                        error(USER, errmsg);
                        break;
                }

        if (i < argc-2)
                error(USER, "too many file arguments");
                                        /* initialize mesh */
        cvinit(i==argc-2 ? argv[i+1] : "<stdout>");
                                        /* read .OBJ file into triangles */
        if (i == argc)
                wfreadobj(NULL);
        else
                wfreadobj(argv[i]);
        
        cvmeshbounds();                 /* set octree boundaries */

        if (i == argc-2)                /* open output file */
                if (freopen(argv[i+1], "w", stdout) == NULL)
                        error(SYSTEM, "cannot open output file");
        SET_FILE_BINARY(stdout);
        newheader("RADIANCE", stdout);  /* new binary file header */
        printargs(i<argc ? i+1 : argc, argv, stdout);
        fputformat(MESHFMT, stdout);
        fputc('\n', stdout);

        mincusize = ourmesh->mcube.cusize / resolu - FTINY;

        for (i = 0; i < nobjects; i++)  /* add triangles to octree */
                if (objptr(i)->otype == OBJ_FACE)
                        addface(&ourmesh->mcube, i);

                                        /* optimize octree */
        ourmesh->mcube.cutree = combine(ourmesh->mcube.cutree);

        if (ourmesh->mcube.cutree == EMPTY)
                error(WARNING, "mesh is empty");
        
        cvmesh();                       /* convert mesh and leaf nodes */

        writemesh(ourmesh, stdout);     /* write mesh to output */
        
        if (verbose)
                printmeshstats(ourmesh, stderr);

        quit(0);
        return 0; /* pro forma return */
}


void
quit(                           /* exit program */
        int  code
)
{
        exit(code);
}


void
cputs(void)                                     /* interactive error */
{
        /* referenced, but not used */
}


void
wputs(                          /* warning message */
        const char  *s
)
{
        if (!nowarn)
                eputs(s);
}


void
eputs(                          /* put string to stderr */
        const char  *s
)
{
        static int  inln = 0;

        if (!inln++) {
                fputs(progname, stderr);
                fputs(": ", stderr);
        }
        fputs(s, stderr);
        if (*s && s[strlen(s)-1] == '\n')
                inln = 0;
}


static void
addface(                        /* add a face to a cube */
        CUBE  *cu,
        OBJECT  obj
)
{

        if (o_face(objptr(obj), cu) == O_MISS)
                return;

        if (istree(cu->cutree)) {
                CUBE  cukid;                    /* do children */
                int  i, j;
                cukid.cusize = cu->cusize * 0.5;
                for (i = 0; i < 8; i++) {
                        cukid.cutree = octkid(cu->cutree, i);
                        for (j = 0; j < 3; j++) {
                                cukid.cuorg[j] = cu->cuorg[j];
                                if ((1<<j) & i)
                                        cukid.cuorg[j] += cukid.cusize;
                        }
                        addface(&cukid, obj);
                        octkid(cu->cutree, i) = cukid.cutree;
                }
                return;
        }
        if (isempty(cu->cutree)) {
                OBJECT  oset[2];                /* singular set */
                oset[0] = 1; oset[1] = obj;
                cu->cutree = fullnode(oset);
                return;
        }
                                        /* add to full node */
        add2full(cu, obj);
}


static void
add2full(                       /* add object to full node */
        CUBE  *cu,
        OBJECT  obj
)
{
        OCTREE  ot;
        OBJECT  oset[MAXSET+1];
        CUBE  cukid;
        int  i, j;

        objset(oset, cu->cutree);
        cukid.cusize = cu->cusize * 0.5;

        if (oset[0] < objlim || cukid.cusize <
                        (oset[0] < MAXSET ? mincusize : mincusize/256.0)) {
                                                /* add to set */
                if (oset[0] >= MAXSET) {
                        sprintf(errmsg, "set overflow in addobject (%s)",
                                        objptr(obj)->oname);
                        error(INTERNAL, errmsg);
                }
                insertelem(oset, obj);
                cu->cutree = fullnode(oset);
                return;
        }
                                        /* subdivide cube */
        if ((ot = octalloc()) == EMPTY)
                error(SYSTEM, "out of octree space");
                                        /* assign subcubes */
        for (i = 0; i < 8; i++) {
                cukid.cutree = EMPTY;
                for (j = 0; j < 3; j++) {
                        cukid.cuorg[j] = cu->cuorg[j];
                        if ((1<<j) & i)
                                cukid.cuorg[j] += cukid.cusize;
                }
                for (j = 1; j <= oset[0]; j++)
                        addface(&cukid, oset[j]);
                addface(&cukid, obj);
                                        /* returned node */
                octkid(ot, i) = cukid.cutree;
        }
        cu->cutree = ot;
}
Revision:	2.18
Committed:	Tue Jun 3 21:31:51 2025 UTC (3 days, 13 hours ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.17:	+3 -4 lines
Log Message:	refactor: More consistent use of global char * progname and fixargv0()
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.18	static const char RCSid[] = "$Id: obj2mesh.c,v 2.17 2023/02/06 22:40:21 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* Main program to compile a Wavefront .OBJ file into a Radiance mesh
6			*/
7
8			#include "copyright.h"
9	greg	2.13	#include "paths.h"
10	schorsch	2.6	#include "platform.h"
11	greg	2.1	#include "standard.h"
12	schorsch	2.8	#include "resolu.h"
13	greg	2.1	#include "cvmesh.h"
14			#include "otypes.h"
15
16	schorsch	2.8	extern int o_face(); /* XXX should go to a header file */
17	greg	2.1
18			int o_default() { return(O_MISS); }
19
20			FUN ofun[NUMOTYPE] = INIT_OTYPE; /* needed for link resolution */
21
22			int nowarn = 0; /* supress warnings? */
23
24	greg	2.12	int objlim = 9; /* # of objects before split */
25	greg	2.1
26			int resolu = 16384; /* octree resolution limit */
27
28			double mincusize; /* minimum cube size from resolu */
29
30	schorsch	2.8	static void addface(CUBE *cu, OBJECT obj);
31			static void add2full(CUBE *cu, OBJECT obj);
32	greg	2.1
33	schorsch	2.8
34			int
35			main( /* compile a .OBJ file into a mesh */
36			int argc,
37			char *argv[]
38			)
39	greg	2.1	{
40	greg	2.15	int verbose = 0;
41	greg	2.11	char *cp;
42	greg	2.3	int i, j;
43	greg	2.1
44	greg	2.18	fixargv0(argv[0]); /* sets global progname */
45
46	greg	2.1	ofun[OBJ_FACE].funp = o_face;
47
48			for (i = 1; i < argc && argv[i][0] == '-'; i++)
49			switch (argv[i][1]) {
50			case 'n': /* set limit */
51			objlim = atoi(argv[++i]);
52			break;
53			case 'r': /* resolution limit */
54			resolu = atoi(argv[++i]);
55			break;
56	greg	2.3	case 'a': /* material file */
57	greg	2.16	readobj(argv[++i]);
58	greg	2.3	break;
59	greg	2.11	case 'l': /* library material */
60			cp = getpath(argv[++i], getrlibpath(), R_OK);
61			if (cp == NULL) {
62			sprintf(errmsg,
63			"cannot find library material: '%s'",
64			argv[i]);
65	greg	2.14	error(SYSTEM, errmsg);
66	greg	2.11	}
67	greg	2.16	readobj(cp);
68	greg	2.11	break;
69	greg	2.1	case 'w': /* supress warnings */
70			nowarn = 1;
71			break;
72	greg	2.15	case 'v': /* print mesh stats */
73			verbose = 1;
74			break;
75	greg	2.1	default:
76			sprintf(errmsg, "unknown option: '%s'", argv[i]);
77			error(USER, errmsg);
78			break;
79			}
80	greg	2.7
81			if (i < argc-2)
82			error(USER, "too many file arguments");
83	greg	2.1	/* initialize mesh */
84			cvinit(i==argc-2 ? argv[i+1] : "<stdout>");
85	greg	2.3	/* read .OBJ file into triangles */
86			if (i == argc)
87	greg	2.1	wfreadobj(NULL);
88			else
89			wfreadobj(argv[i]);
90
91			cvmeshbounds(); /* set octree boundaries */
92
93			if (i == argc-2) /* open output file */
94			if (freopen(argv[i+1], "w", stdout) == NULL)
95			error(SYSTEM, "cannot open output file");
96	schorsch	2.5	SET_FILE_BINARY(stdout);
97	greg	2.1	newheader("RADIANCE", stdout); /* new binary file header */
98			printargs(i<argc ? i+1 : argc, argv, stdout);
99			fputformat(MESHFMT, stdout);
100			fputc('\n', stdout);
101
102			mincusize = ourmesh->mcube.cusize / resolu - FTINY;
103
104			for (i = 0; i < nobjects; i++) /* add triangles to octree */
105	greg	2.3	if (objptr(i)->otype == OBJ_FACE)
106			addface(&ourmesh->mcube, i);
107	greg	2.1
108			/* optimize octree */
109			ourmesh->mcube.cutree = combine(ourmesh->mcube.cutree);
110
111			if (ourmesh->mcube.cutree == EMPTY)
112			error(WARNING, "mesh is empty");
113
114			cvmesh(); /* convert mesh and leaf nodes */
115
116			writemesh(ourmesh, stdout); /* write mesh to output */
117
118	greg	2.15	if (verbose)
119			printmeshstats(ourmesh, stderr);
120	greg	2.1
121			quit(0);
122	schorsch	2.8	return 0; /* pro forma return */
123	greg	2.1	}
124
125
126			void
127	schorsch	2.8	quit( /* exit program */
128			int code
129			)
130	greg	2.1	{
131			exit(code);
132			}
133
134
135			void
136	schorsch	2.8	cputs(void) /* interactive error */
137	greg	2.1	{
138			/* referenced, but not used */
139			}
140
141
142			void
143	schorsch	2.8	wputs( /* warning message */
144	greg	2.17	const char *s
145	schorsch	2.8	)
146	greg	2.1	{
147			if (!nowarn)
148			eputs(s);
149			}
150
151
152			void
153	schorsch	2.8	eputs( /* put string to stderr */
154	greg	2.17	const char *s
155	schorsch	2.8	)
156	greg	2.1	{
157			static int inln = 0;
158
159			if (!inln++) {
160			fputs(progname, stderr);
161			fputs(": ", stderr);
162			}
163			fputs(s, stderr);
164			if (*s && s[strlen(s)-1] == '\n')
165			inln = 0;
166			}
167
168
169	schorsch	2.8	static void
170			addface( /* add a face to a cube */
171	greg	2.17	CUBE *cu,
172	schorsch	2.8	OBJECT obj
173			)
174	greg	2.1	{
175
176			if (o_face(objptr(obj), cu) == O_MISS)
177			return;
178
179			if (istree(cu->cutree)) {
180	greg	2.2	CUBE cukid; /* do children */
181			int i, j;
182	greg	2.1	cukid.cusize = cu->cusize * 0.5;
183			for (i = 0; i < 8; i++) {
184			cukid.cutree = octkid(cu->cutree, i);
185			for (j = 0; j < 3; j++) {
186			cukid.cuorg[j] = cu->cuorg[j];
187			if ((1<<j) & i)
188			cukid.cuorg[j] += cukid.cusize;
189			}
190			addface(&cukid, obj);
191			octkid(cu->cutree, i) = cukid.cutree;
192			}
193			return;
194			}
195			if (isempty(cu->cutree)) {
196	greg	2.2	OBJECT oset[2]; /* singular set */
197	greg	2.1	oset[0] = 1; oset[1] = obj;
198			cu->cutree = fullnode(oset);
199			return;
200			}
201			/* add to full node */
202	greg	2.2	add2full(cu, obj);
203			}
204
205
206	schorsch	2.8	static void
207			add2full( /* add object to full node */
208	greg	2.17	CUBE *cu,
209	schorsch	2.8	OBJECT obj
210			)
211	greg	2.2	{
212			OCTREE ot;
213			OBJECT oset[MAXSET+1];
214			CUBE cukid;
215	greg	2.17	int i, j;
216	greg	2.2
217	greg	2.1	objset(oset, cu->cutree);
218			cukid.cusize = cu->cusize * 0.5;
219
220	greg	2.10	if (oset[0] < objlim \|\| cukid.cusize <
221	greg	2.9	(oset[0] < MAXSET ? mincusize : mincusize/256.0)) {
222	greg	2.1	/* add to set */
223			if (oset[0] >= MAXSET) {
224	greg	2.2	sprintf(errmsg, "set overflow in addobject (%s)",
225	greg	2.1	objptr(obj)->oname);
226			error(INTERNAL, errmsg);
227			}
228			insertelem(oset, obj);
229			cu->cutree = fullnode(oset);
230			return;
231			}
232			/* subdivide cube */
233			if ((ot = octalloc()) == EMPTY)
234			error(SYSTEM, "out of octree space");
235			/* assign subcubes */
236			for (i = 0; i < 8; i++) {
237			cukid.cutree = EMPTY;
238			for (j = 0; j < 3; j++) {
239			cukid.cuorg[j] = cu->cuorg[j];
240			if ((1<<j) & i)
241			cukid.cuorg[j] += cukid.cusize;
242			}
243			for (j = 1; j <= oset[0]; j++)
244			addface(&cukid, oset[j]);
245			addface(&cukid, obj);
246			/* returned node */
247			octkid(ot, i) = cukid.cutree;
248			}
249			cu->cutree = ot;
250			}