1 |
greg |
2.1 |
#ifndef lint |
2 |
greg |
2.12 |
static const char RCSid[] = "$Id: cvmesh.c,v 2.11 2011/02/18 19:00:43 greg Exp $"; |
3 |
greg |
2.1 |
#endif |
4 |
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/* |
5 |
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* Radiance triangle mesh conversion routines |
6 |
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*/ |
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8 |
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#include "copyright.h" |
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#include "standard.h" |
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#include "cvmesh.h" |
11 |
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#include "otypes.h" |
12 |
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#include "face.h" |
13 |
greg |
2.8 |
#include "tmesh.h" |
14 |
greg |
2.1 |
|
15 |
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/* |
16 |
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* We need to divide faces into triangles and record auxiliary information |
17 |
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* if given (surface normal and uv coordinates). We do this by extending |
18 |
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* the face structure linked to the OBJREC os member and putting our |
19 |
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* auxiliary after it -- a bit sly, but it works. |
20 |
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*/ |
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22 |
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/* Auxiliary data for triangle */ |
23 |
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typedef struct { |
24 |
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int fl; /* flags of what we're storing */ |
25 |
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OBJECT obj; /* mesh triangle ID */ |
26 |
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FVECT vn[3]; /* normals */ |
27 |
schorsch |
2.6 |
RREAL vc[3][2]; /* uv coords. */ |
28 |
greg |
2.1 |
} TRIDATA; |
29 |
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30 |
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#define tdsize(fl) ((fl)&MT_UV ? sizeof(TRIDATA) : \ |
31 |
schorsch |
2.6 |
(fl)&MT_N ? sizeof(TRIDATA)-6*sizeof(RREAL) : \ |
32 |
greg |
2.1 |
sizeof(int)+sizeof(OBJECT)) |
33 |
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34 |
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#define OMARGIN (10*FTINY) /* margin around global cube */ |
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36 |
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MESH *ourmesh = NULL; /* our global mesh data structure */ |
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38 |
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FVECT meshbounds[2]; /* mesh bounding box */ |
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40 |
schorsch |
2.9 |
static void add2bounds(FVECT vp, RREAL vc[2]); |
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static OBJECT cvmeshtri(OBJECT obj); |
42 |
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static OCTREE cvmeshoct(OCTREE ot); |
43 |
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44 |
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45 |
greg |
2.1 |
|
46 |
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MESH * |
47 |
schorsch |
2.9 |
cvinit( /* initialize empty mesh */ |
48 |
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char *nm |
49 |
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) |
50 |
greg |
2.1 |
{ |
51 |
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/* free old mesh, first */ |
52 |
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if (ourmesh != NULL) { |
53 |
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freemesh(ourmesh); |
54 |
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ourmesh = NULL; |
55 |
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freeobjects(0, nobjects); |
56 |
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donesets(); |
57 |
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} |
58 |
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if (nm == NULL) |
59 |
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return(NULL); |
60 |
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ourmesh = (MESH *)calloc(1, sizeof(MESH)); |
61 |
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if (ourmesh == NULL) |
62 |
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goto nomem; |
63 |
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ourmesh->name = savestr(nm); |
64 |
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ourmesh->nref = 1; |
65 |
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ourmesh->ldflags = 0; |
66 |
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ourmesh->mcube.cutree = EMPTY; |
67 |
greg |
2.2 |
ourmesh->uvlim[0][0] = ourmesh->uvlim[0][1] = FHUGE; |
68 |
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ourmesh->uvlim[1][0] = ourmesh->uvlim[1][1] = -FHUGE; |
69 |
greg |
2.1 |
meshbounds[0][0] = meshbounds[0][1] = meshbounds[0][2] = FHUGE; |
70 |
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meshbounds[1][0] = meshbounds[1][1] = meshbounds[1][2] = -FHUGE; |
71 |
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return(ourmesh); |
72 |
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nomem: |
73 |
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error(SYSTEM, "out of memory in cvinit"); |
74 |
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return(NULL); |
75 |
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} |
76 |
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77 |
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78 |
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static void |
79 |
schorsch |
2.9 |
add2bounds( /* add point and uv coordinate to bounds */ |
80 |
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FVECT vp, |
81 |
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RREAL vc[2] |
82 |
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) |
83 |
greg |
2.1 |
{ |
84 |
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register int j; |
85 |
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86 |
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for (j = 3; j--; ) { |
87 |
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if (vp[j] < meshbounds[0][j]) |
88 |
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meshbounds[0][j] = vp[j]; |
89 |
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if (vp[j] > meshbounds[1][j]) |
90 |
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meshbounds[1][j] = vp[j]; |
91 |
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} |
92 |
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if (vc == NULL) |
93 |
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return; |
94 |
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for (j = 2; j--; ) { |
95 |
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if (vc[j] < ourmesh->uvlim[0][j]) |
96 |
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ourmesh->uvlim[0][j] = vc[j]; |
97 |
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if (vc[j] > ourmesh->uvlim[1][j]) |
98 |
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ourmesh->uvlim[1][j] = vc[j]; |
99 |
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} |
100 |
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} |
101 |
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102 |
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103 |
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int /* create an extended triangle */ |
104 |
schorsch |
2.9 |
cvtri( |
105 |
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OBJECT mo, |
106 |
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FVECT vp1, |
107 |
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FVECT vp2, |
108 |
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FVECT vp3, |
109 |
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FVECT vn1, |
110 |
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FVECT vn2, |
111 |
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FVECT vn3, |
112 |
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RREAL vc1[2], |
113 |
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RREAL vc2[2], |
114 |
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RREAL vc3[2] |
115 |
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) |
116 |
greg |
2.1 |
{ |
117 |
greg |
2.3 |
static OBJECT fobj = OVOID; |
118 |
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char buf[32]; |
119 |
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int flags; |
120 |
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TRIDATA *ts; |
121 |
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FACE *f; |
122 |
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OBJREC *fop; |
123 |
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int j; |
124 |
greg |
2.1 |
|
125 |
greg |
2.8 |
flags = MT_V; /* check what we have */ |
126 |
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if (vn1 != NULL && vn2 != NULL && vn3 != NULL) { |
127 |
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RREAL *rp; |
128 |
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switch (flat_tri(vp1, vp2, vp3, vn1, vn2, vn3)) { |
129 |
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case ISBENT: |
130 |
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flags |= MT_N; |
131 |
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/* fall through */ |
132 |
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case ISFLAT: |
133 |
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break; |
134 |
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case RVBENT: |
135 |
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flags |= MT_N; |
136 |
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rp = vn1; vn1 = vn3; vn3 = rp; |
137 |
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/* fall through */ |
138 |
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case RVFLAT: |
139 |
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rp = vp1; vp1 = vp3; vp3 = rp; |
140 |
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rp = vc1; vc1 = vc3; vc3 = rp; |
141 |
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break; |
142 |
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case DEGEN: |
143 |
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error(WARNING, "degenerate triangle"); |
144 |
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return(0); |
145 |
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default: |
146 |
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error(INTERNAL, "bad return from flat_tri()"); |
147 |
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} |
148 |
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} |
149 |
greg |
2.1 |
if (vc1 != NULL && vc2 != NULL && vc3 != NULL) |
150 |
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flags |= MT_UV; |
151 |
greg |
2.3 |
if (fobj == OVOID) { /* create new triangle object */ |
152 |
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fobj = newobject(); |
153 |
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if (fobj == OVOID) |
154 |
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goto nomem; |
155 |
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fop = objptr(fobj); |
156 |
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fop->omod = mo; |
157 |
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fop->otype = OBJ_FACE; |
158 |
greg |
2.11 |
sprintf(buf, "t%ld", (long)fobj); |
159 |
greg |
2.3 |
fop->oname = savqstr(buf); |
160 |
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fop->oargs.nfargs = 9; |
161 |
schorsch |
2.6 |
fop->oargs.farg = (RREAL *)malloc(9*sizeof(RREAL)); |
162 |
greg |
2.3 |
if (fop->oargs.farg == NULL) |
163 |
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goto nomem; |
164 |
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} else { /* else reuse failed one */ |
165 |
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fop = objptr(fobj); |
166 |
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if (fop->otype != OBJ_FACE || fop->oargs.nfargs != 9) |
167 |
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error(CONSISTENCY, "code error 1 in cvtri"); |
168 |
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} |
169 |
greg |
2.1 |
for (j = 3; j--; ) { |
170 |
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fop->oargs.farg[j] = vp1[j]; |
171 |
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fop->oargs.farg[3+j] = vp2[j]; |
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fop->oargs.farg[6+j] = vp3[j]; |
173 |
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} |
174 |
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/* create face record */ |
175 |
greg |
2.3 |
f = getface(fop); |
176 |
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if (f->area == 0.) { |
177 |
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free_os(fop); |
178 |
greg |
2.1 |
return(0); |
179 |
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} |
180 |
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if (fop->os != (char *)f) |
181 |
greg |
2.3 |
error(CONSISTENCY, "code error 2 in cvtri"); |
182 |
greg |
2.1 |
/* follow with auxliary data */ |
183 |
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f = (FACE *)realloc((void *)f, sizeof(FACE)+tdsize(flags)); |
184 |
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if (f == NULL) |
185 |
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goto nomem; |
186 |
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fop->os = (char *)f; |
187 |
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ts = (TRIDATA *)(f+1); |
188 |
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ts->fl = flags; |
189 |
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ts->obj = OVOID; |
190 |
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if (flags & MT_N) |
191 |
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for (j = 3; j--; ) { |
192 |
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ts->vn[0][j] = vn1[j]; |
193 |
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ts->vn[1][j] = vn2[j]; |
194 |
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ts->vn[2][j] = vn3[j]; |
195 |
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} |
196 |
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if (flags & MT_UV) |
197 |
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for (j = 2; j--; ) { |
198 |
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ts->vc[0][j] = vc1[j]; |
199 |
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ts->vc[1][j] = vc2[j]; |
200 |
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ts->vc[2][j] = vc3[j]; |
201 |
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} |
202 |
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else |
203 |
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vc1 = vc2 = vc3 = NULL; |
204 |
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/* update bounds */ |
205 |
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add2bounds(vp1, vc1); |
206 |
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add2bounds(vp2, vc2); |
207 |
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add2bounds(vp3, vc3); |
208 |
greg |
2.3 |
fobj = OVOID; /* we used this one */ |
209 |
greg |
2.1 |
return(1); |
210 |
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nomem: |
211 |
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error(SYSTEM, "out of memory in cvtri"); |
212 |
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return(0); |
213 |
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} |
214 |
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215 |
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216 |
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static OBJECT |
217 |
schorsch |
2.9 |
cvmeshtri( /* add an extended triangle to our mesh */ |
218 |
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OBJECT obj |
219 |
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) |
220 |
greg |
2.1 |
{ |
221 |
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OBJREC *o = objptr(obj); |
222 |
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TRIDATA *ts; |
223 |
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MESHVERT vert[3]; |
224 |
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int i, j; |
225 |
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226 |
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if (o->otype != OBJ_FACE) |
227 |
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error(CONSISTENCY, "non-face in mesh"); |
228 |
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if (o->oargs.nfargs != 9) |
229 |
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error(CONSISTENCY, "non-triangle in mesh"); |
230 |
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if (o->os == NULL) |
231 |
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error(CONSISTENCY, "missing face record in cvmeshtri"); |
232 |
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ts = (TRIDATA *)((FACE *)o->os + 1); |
233 |
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if (ts->obj != OVOID) /* already added? */ |
234 |
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return(ts->obj); |
235 |
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vert[0].fl = vert[1].fl = vert[2].fl = ts->fl; |
236 |
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for (i = 3; i--; ) |
237 |
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for (j = 3; j--; ) |
238 |
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vert[i].v[j] = o->oargs.farg[3*i+j]; |
239 |
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if (ts->fl & MT_N) |
240 |
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for (i = 3; i--; ) |
241 |
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for (j = 3; j--; ) |
242 |
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vert[i].n[j] = ts->vn[i][j]; |
243 |
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if (ts->fl & MT_UV) |
244 |
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for (i = 3; i--; ) |
245 |
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for (j = 2; j--; ) |
246 |
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vert[i].uv[j] = ts->vc[i][j]; |
247 |
greg |
2.3 |
ts->obj = addmeshtri(ourmesh, vert, o->omod); |
248 |
greg |
2.1 |
if (ts->obj == OVOID) |
249 |
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error(INTERNAL, "addmeshtri failed"); |
250 |
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return(ts->obj); |
251 |
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} |
252 |
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253 |
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254 |
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void |
255 |
schorsch |
2.9 |
cvmeshbounds(void) /* set mesh boundaries */ |
256 |
greg |
2.1 |
{ |
257 |
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int i; |
258 |
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259 |
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if (ourmesh == NULL) |
260 |
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return; |
261 |
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/* fix coordinate bounds */ |
262 |
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for (i = 0; i < 3; i++) { |
263 |
greg |
2.5 |
if (meshbounds[0][i] > meshbounds[1][i]) |
264 |
greg |
2.1 |
error(USER, "no polygons in mesh"); |
265 |
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meshbounds[0][i] -= OMARGIN; |
266 |
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meshbounds[1][i] += OMARGIN; |
267 |
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if (meshbounds[1][i]-meshbounds[0][i] > ourmesh->mcube.cusize) |
268 |
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ourmesh->mcube.cusize = meshbounds[1][i] - |
269 |
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meshbounds[0][i]; |
270 |
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} |
271 |
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for (i = 0; i < 3; i++) |
272 |
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ourmesh->mcube.cuorg[i] = (meshbounds[1][i]+meshbounds[0][i] - |
273 |
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ourmesh->mcube.cusize)*.5; |
274 |
greg |
2.2 |
if (ourmesh->uvlim[0][0] > ourmesh->uvlim[1][0]) { |
275 |
greg |
2.1 |
ourmesh->uvlim[0][0] = ourmesh->uvlim[0][1] = 0.; |
276 |
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ourmesh->uvlim[1][0] = ourmesh->uvlim[1][1] = 0.; |
277 |
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} else { |
278 |
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for (i = 0; i < 2; i++) { |
279 |
greg |
2.7 |
double marg; /* expand past endpoints */ |
280 |
|
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marg = (2./(1L<<(8*sizeof(uint16)))) * |
281 |
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(ourmesh->uvlim[1][i] - |
282 |
greg |
2.10 |
ourmesh->uvlim[0][i]) + FTINY; |
283 |
greg |
2.1 |
ourmesh->uvlim[0][i] -= marg; |
284 |
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ourmesh->uvlim[1][i] += marg; |
285 |
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} |
286 |
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} |
287 |
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ourmesh->ldflags |= IO_BOUNDS; |
288 |
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} |
289 |
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290 |
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291 |
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static OCTREE |
292 |
schorsch |
2.9 |
cvmeshoct( /* convert triangles in subtree */ |
293 |
|
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OCTREE ot |
294 |
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) |
295 |
greg |
2.1 |
{ |
296 |
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int i; |
297 |
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298 |
|
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if (isempty(ot)) |
299 |
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return(EMPTY); |
300 |
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301 |
|
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if (isfull(ot)) { |
302 |
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OBJECT oset1[MAXSET+1]; |
303 |
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OBJECT oset2[MAXSET+1]; |
304 |
|
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objset(oset1, ot); |
305 |
|
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oset2[0] = 0; |
306 |
|
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for (i = oset1[0]; i > 0; i--) |
307 |
|
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insertelem(oset2, cvmeshtri(oset1[i])); |
308 |
|
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return(fullnode(oset2)); |
309 |
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} |
310 |
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311 |
|
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for (i = 8; i--; ) |
312 |
|
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octkid(ot, i) = cvmeshoct(octkid(ot, i)); |
313 |
|
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return(ot); |
314 |
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} |
315 |
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316 |
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317 |
|
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MESH * |
318 |
schorsch |
2.9 |
cvmesh(void) /* convert mesh and octree leaf nodes */ |
319 |
greg |
2.1 |
{ |
320 |
|
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if (ourmesh == NULL) |
321 |
|
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return(NULL); |
322 |
|
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/* convert triangles in octree nodes */ |
323 |
|
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ourmesh->mcube.cutree = cvmeshoct(ourmesh->mcube.cutree); |
324 |
|
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ourmesh->ldflags |= IO_SCENE|IO_TREE; |
325 |
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326 |
|
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return(ourmesh); |
327 |
|
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} |