| 1 |
greg |
2.1 |
#ifndef lint |
| 2 |
greg |
2.8 |
static const char RCSid[] = "$Id: cvmesh.c,v 2.7 2003/09/18 16:53:53 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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*/ |
| 7 |
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| 8 |
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#include "copyright.h" |
| 9 |
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#include "standard.h" |
| 10 |
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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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*/ |
| 21 |
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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 */ |
| 35 |
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| 36 |
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MESH *ourmesh = NULL; /* our global mesh data structure */ |
| 37 |
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| 38 |
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FVECT meshbounds[2]; /* mesh bounding box */ |
| 39 |
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| 40 |
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| 41 |
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MESH * |
| 42 |
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cvinit(nm) /* initialize empty mesh */ |
| 43 |
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char *nm; |
| 44 |
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{ |
| 45 |
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/* free old mesh, first */ |
| 46 |
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if (ourmesh != NULL) { |
| 47 |
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freemesh(ourmesh); |
| 48 |
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ourmesh = NULL; |
| 49 |
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freeobjects(0, nobjects); |
| 50 |
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donesets(); |
| 51 |
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} |
| 52 |
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if (nm == NULL) |
| 53 |
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return(NULL); |
| 54 |
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ourmesh = (MESH *)calloc(1, sizeof(MESH)); |
| 55 |
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if (ourmesh == NULL) |
| 56 |
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goto nomem; |
| 57 |
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ourmesh->name = savestr(nm); |
| 58 |
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ourmesh->nref = 1; |
| 59 |
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ourmesh->ldflags = 0; |
| 60 |
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ourmesh->mcube.cutree = EMPTY; |
| 61 |
greg |
2.2 |
ourmesh->uvlim[0][0] = ourmesh->uvlim[0][1] = FHUGE; |
| 62 |
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ourmesh->uvlim[1][0] = ourmesh->uvlim[1][1] = -FHUGE; |
| 63 |
greg |
2.1 |
meshbounds[0][0] = meshbounds[0][1] = meshbounds[0][2] = FHUGE; |
| 64 |
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meshbounds[1][0] = meshbounds[1][1] = meshbounds[1][2] = -FHUGE; |
| 65 |
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return(ourmesh); |
| 66 |
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nomem: |
| 67 |
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error(SYSTEM, "out of memory in cvinit"); |
| 68 |
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return(NULL); |
| 69 |
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} |
| 70 |
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| 71 |
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| 72 |
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int |
| 73 |
greg |
2.3 |
cvpoly(mo, n, vp, vn, vc) /* convert a polygon to extended triangles */ |
| 74 |
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OBJECT mo; |
| 75 |
greg |
2.1 |
int n; |
| 76 |
|
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FVECT *vp; |
| 77 |
|
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FVECT *vn; |
| 78 |
schorsch |
2.6 |
RREAL (*vc)[2]; |
| 79 |
greg |
2.1 |
{ |
| 80 |
|
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int tcnt = 0; |
| 81 |
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int flags; |
| 82 |
schorsch |
2.6 |
RREAL *tn[3], *tc[3]; |
| 83 |
greg |
2.1 |
int *ord; |
| 84 |
|
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int i, j; |
| 85 |
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| 86 |
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if (n < 3) /* degenerate face */ |
| 87 |
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return(0); |
| 88 |
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flags = MT_V; |
| 89 |
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if (vn != NULL) { |
| 90 |
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tn[0] = vn[0]; tn[1] = vn[1]; tn[2] = vn[2]; |
| 91 |
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flags |= MT_N; |
| 92 |
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} else { |
| 93 |
|
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tn[0] = tn[1] = tn[2] = NULL; |
| 94 |
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} |
| 95 |
|
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if (vc != NULL) { |
| 96 |
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tc[0] = vc[0]; tc[1] = vc[1]; tc[2] = vc[2]; |
| 97 |
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flags |= MT_UV; |
| 98 |
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} else { |
| 99 |
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tc[0] = tc[1] = tc[2] = NULL; |
| 100 |
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} |
| 101 |
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if (n == 3) /* output single triangle */ |
| 102 |
greg |
2.3 |
return(cvtri(mo, vp[0], vp[1], vp[2], |
| 103 |
greg |
2.1 |
tn[0], tn[1], tn[2], |
| 104 |
|
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tc[0], tc[1], tc[2])); |
| 105 |
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| 106 |
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/* decimate polygon (assumes convex) */ |
| 107 |
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ord = (int *)malloc(n*sizeof(int)); |
| 108 |
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if (ord == NULL) |
| 109 |
|
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error(SYSTEM, "out of memory in cvpoly"); |
| 110 |
|
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for (i = n; i--; ) |
| 111 |
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ord[i] = i; |
| 112 |
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while (n >= 3) { |
| 113 |
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if (flags & MT_N) |
| 114 |
|
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for (i = 3; i--; ) |
| 115 |
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tn[i] = vn[ord[i]]; |
| 116 |
|
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if (flags & MT_UV) |
| 117 |
|
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for (i = 3; i--; ) |
| 118 |
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tc[i] = vc[ord[i]]; |
| 119 |
greg |
2.3 |
tcnt += cvtri(mo, vp[ord[0]], vp[ord[1]], vp[ord[2]], |
| 120 |
greg |
2.1 |
tn[0], tn[1], tn[2], |
| 121 |
|
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tc[0], tc[1], tc[2]); |
| 122 |
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/* remove vertex and rotate */ |
| 123 |
|
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n--; |
| 124 |
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j = ord[0]; |
| 125 |
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for (i = 0; i < n-1; i++) |
| 126 |
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ord[i] = ord[i+2]; |
| 127 |
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ord[i] = j; |
| 128 |
|
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} |
| 129 |
|
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free((void *)ord); |
| 130 |
|
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return(tcnt); |
| 131 |
|
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} |
| 132 |
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| 133 |
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| 134 |
|
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static void |
| 135 |
|
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add2bounds(vp, vc) /* add point and uv coordinate to bounds */ |
| 136 |
|
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FVECT vp; |
| 137 |
schorsch |
2.6 |
RREAL vc[2]; |
| 138 |
greg |
2.1 |
{ |
| 139 |
|
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register int j; |
| 140 |
|
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|
| 141 |
|
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for (j = 3; j--; ) { |
| 142 |
|
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if (vp[j] < meshbounds[0][j]) |
| 143 |
|
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meshbounds[0][j] = vp[j]; |
| 144 |
|
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if (vp[j] > meshbounds[1][j]) |
| 145 |
|
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meshbounds[1][j] = vp[j]; |
| 146 |
|
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} |
| 147 |
|
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if (vc == NULL) |
| 148 |
|
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return; |
| 149 |
|
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for (j = 2; j--; ) { |
| 150 |
|
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if (vc[j] < ourmesh->uvlim[0][j]) |
| 151 |
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ourmesh->uvlim[0][j] = vc[j]; |
| 152 |
|
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if (vc[j] > ourmesh->uvlim[1][j]) |
| 153 |
|
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ourmesh->uvlim[1][j] = vc[j]; |
| 154 |
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} |
| 155 |
|
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} |
| 156 |
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| 157 |
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| 158 |
|
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int /* create an extended triangle */ |
| 159 |
greg |
2.3 |
cvtri(mo, vp1, vp2, vp3, vn1, vn2, vn3, vc1, vc2, vc3) |
| 160 |
|
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OBJECT mo; |
| 161 |
greg |
2.1 |
FVECT vp1, vp2, vp3; |
| 162 |
|
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FVECT vn1, vn2, vn3; |
| 163 |
schorsch |
2.6 |
RREAL vc1[2], vc2[2], vc3[2]; |
| 164 |
greg |
2.1 |
{ |
| 165 |
greg |
2.3 |
static OBJECT fobj = OVOID; |
| 166 |
|
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char buf[32]; |
| 167 |
|
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int flags; |
| 168 |
|
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TRIDATA *ts; |
| 169 |
|
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FACE *f; |
| 170 |
|
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OBJREC *fop; |
| 171 |
|
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int j; |
| 172 |
greg |
2.1 |
|
| 173 |
greg |
2.8 |
flags = MT_V; /* check what we have */ |
| 174 |
|
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if (vn1 != NULL && vn2 != NULL && vn3 != NULL) { |
| 175 |
|
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RREAL *rp; |
| 176 |
|
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switch (flat_tri(vp1, vp2, vp3, vn1, vn2, vn3)) { |
| 177 |
|
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case ISBENT: |
| 178 |
|
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flags |= MT_N; |
| 179 |
|
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/* fall through */ |
| 180 |
|
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case ISFLAT: |
| 181 |
|
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break; |
| 182 |
|
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case RVBENT: |
| 183 |
|
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flags |= MT_N; |
| 184 |
|
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rp = vn1; vn1 = vn3; vn3 = rp; |
| 185 |
|
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/* fall through */ |
| 186 |
|
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case RVFLAT: |
| 187 |
|
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rp = vp1; vp1 = vp3; vp3 = rp; |
| 188 |
|
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rp = vc1; vc1 = vc3; vc3 = rp; |
| 189 |
|
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break; |
| 190 |
|
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case DEGEN: |
| 191 |
|
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error(WARNING, "degenerate triangle"); |
| 192 |
|
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return(0); |
| 193 |
|
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default: |
| 194 |
|
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error(INTERNAL, "bad return from flat_tri()"); |
| 195 |
|
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} |
| 196 |
|
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} |
| 197 |
greg |
2.1 |
if (vc1 != NULL && vc2 != NULL && vc3 != NULL) |
| 198 |
|
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flags |= MT_UV; |
| 199 |
greg |
2.3 |
if (fobj == OVOID) { /* create new triangle object */ |
| 200 |
|
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fobj = newobject(); |
| 201 |
|
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if (fobj == OVOID) |
| 202 |
|
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goto nomem; |
| 203 |
|
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fop = objptr(fobj); |
| 204 |
|
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fop->omod = mo; |
| 205 |
|
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fop->otype = OBJ_FACE; |
| 206 |
|
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sprintf(buf, "t%d", fobj); |
| 207 |
|
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fop->oname = savqstr(buf); |
| 208 |
|
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fop->oargs.nfargs = 9; |
| 209 |
schorsch |
2.6 |
fop->oargs.farg = (RREAL *)malloc(9*sizeof(RREAL)); |
| 210 |
greg |
2.3 |
if (fop->oargs.farg == NULL) |
| 211 |
|
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goto nomem; |
| 212 |
|
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} else { /* else reuse failed one */ |
| 213 |
|
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fop = objptr(fobj); |
| 214 |
|
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if (fop->otype != OBJ_FACE || fop->oargs.nfargs != 9) |
| 215 |
|
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error(CONSISTENCY, "code error 1 in cvtri"); |
| 216 |
|
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} |
| 217 |
greg |
2.1 |
for (j = 3; j--; ) { |
| 218 |
|
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fop->oargs.farg[j] = vp1[j]; |
| 219 |
|
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fop->oargs.farg[3+j] = vp2[j]; |
| 220 |
|
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fop->oargs.farg[6+j] = vp3[j]; |
| 221 |
|
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} |
| 222 |
|
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/* create face record */ |
| 223 |
greg |
2.3 |
f = getface(fop); |
| 224 |
|
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if (f->area == 0.) { |
| 225 |
|
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free_os(fop); |
| 226 |
greg |
2.1 |
return(0); |
| 227 |
|
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} |
| 228 |
|
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if (fop->os != (char *)f) |
| 229 |
greg |
2.3 |
error(CONSISTENCY, "code error 2 in cvtri"); |
| 230 |
greg |
2.1 |
/* follow with auxliary data */ |
| 231 |
|
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f = (FACE *)realloc((void *)f, sizeof(FACE)+tdsize(flags)); |
| 232 |
|
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if (f == NULL) |
| 233 |
|
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goto nomem; |
| 234 |
|
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fop->os = (char *)f; |
| 235 |
|
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ts = (TRIDATA *)(f+1); |
| 236 |
|
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ts->fl = flags; |
| 237 |
|
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ts->obj = OVOID; |
| 238 |
|
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if (flags & MT_N) |
| 239 |
|
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for (j = 3; j--; ) { |
| 240 |
|
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ts->vn[0][j] = vn1[j]; |
| 241 |
|
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ts->vn[1][j] = vn2[j]; |
| 242 |
|
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ts->vn[2][j] = vn3[j]; |
| 243 |
|
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} |
| 244 |
|
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if (flags & MT_UV) |
| 245 |
|
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for (j = 2; j--; ) { |
| 246 |
|
|
ts->vc[0][j] = vc1[j]; |
| 247 |
|
|
ts->vc[1][j] = vc2[j]; |
| 248 |
|
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ts->vc[2][j] = vc3[j]; |
| 249 |
|
|
} |
| 250 |
|
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else |
| 251 |
|
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vc1 = vc2 = vc3 = NULL; |
| 252 |
|
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/* update bounds */ |
| 253 |
|
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add2bounds(vp1, vc1); |
| 254 |
|
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add2bounds(vp2, vc2); |
| 255 |
|
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add2bounds(vp3, vc3); |
| 256 |
greg |
2.3 |
fobj = OVOID; /* we used this one */ |
| 257 |
greg |
2.1 |
return(1); |
| 258 |
|
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nomem: |
| 259 |
|
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error(SYSTEM, "out of memory in cvtri"); |
| 260 |
|
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return(0); |
| 261 |
|
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} |
| 262 |
|
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|
| 263 |
|
|
|
| 264 |
|
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static OBJECT |
| 265 |
|
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cvmeshtri(obj) /* add an extended triangle to our mesh */ |
| 266 |
|
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OBJECT obj; |
| 267 |
|
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{ |
| 268 |
|
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OBJREC *o = objptr(obj); |
| 269 |
|
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TRIDATA *ts; |
| 270 |
|
|
MESHVERT vert[3]; |
| 271 |
|
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int i, j; |
| 272 |
|
|
|
| 273 |
|
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if (o->otype != OBJ_FACE) |
| 274 |
|
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error(CONSISTENCY, "non-face in mesh"); |
| 275 |
|
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if (o->oargs.nfargs != 9) |
| 276 |
|
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error(CONSISTENCY, "non-triangle in mesh"); |
| 277 |
|
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if (o->os == NULL) |
| 278 |
|
|
error(CONSISTENCY, "missing face record in cvmeshtri"); |
| 279 |
|
|
ts = (TRIDATA *)((FACE *)o->os + 1); |
| 280 |
|
|
if (ts->obj != OVOID) /* already added? */ |
| 281 |
|
|
return(ts->obj); |
| 282 |
|
|
vert[0].fl = vert[1].fl = vert[2].fl = ts->fl; |
| 283 |
|
|
for (i = 3; i--; ) |
| 284 |
|
|
for (j = 3; j--; ) |
| 285 |
|
|
vert[i].v[j] = o->oargs.farg[3*i+j]; |
| 286 |
|
|
if (ts->fl & MT_N) |
| 287 |
|
|
for (i = 3; i--; ) |
| 288 |
|
|
for (j = 3; j--; ) |
| 289 |
|
|
vert[i].n[j] = ts->vn[i][j]; |
| 290 |
|
|
if (ts->fl & MT_UV) |
| 291 |
|
|
for (i = 3; i--; ) |
| 292 |
|
|
for (j = 2; j--; ) |
| 293 |
|
|
vert[i].uv[j] = ts->vc[i][j]; |
| 294 |
greg |
2.3 |
ts->obj = addmeshtri(ourmesh, vert, o->omod); |
| 295 |
greg |
2.1 |
if (ts->obj == OVOID) |
| 296 |
|
|
error(INTERNAL, "addmeshtri failed"); |
| 297 |
|
|
return(ts->obj); |
| 298 |
|
|
} |
| 299 |
|
|
|
| 300 |
|
|
|
| 301 |
|
|
void |
| 302 |
|
|
cvmeshbounds() /* set mesh boundaries */ |
| 303 |
|
|
{ |
| 304 |
|
|
int i; |
| 305 |
|
|
|
| 306 |
|
|
if (ourmesh == NULL) |
| 307 |
|
|
return; |
| 308 |
|
|
/* fix coordinate bounds */ |
| 309 |
|
|
for (i = 0; i < 3; i++) { |
| 310 |
greg |
2.5 |
if (meshbounds[0][i] > meshbounds[1][i]) |
| 311 |
greg |
2.1 |
error(USER, "no polygons in mesh"); |
| 312 |
|
|
meshbounds[0][i] -= OMARGIN; |
| 313 |
|
|
meshbounds[1][i] += OMARGIN; |
| 314 |
|
|
if (meshbounds[1][i]-meshbounds[0][i] > ourmesh->mcube.cusize) |
| 315 |
|
|
ourmesh->mcube.cusize = meshbounds[1][i] - |
| 316 |
|
|
meshbounds[0][i]; |
| 317 |
|
|
} |
| 318 |
|
|
for (i = 0; i < 3; i++) |
| 319 |
|
|
ourmesh->mcube.cuorg[i] = (meshbounds[1][i]+meshbounds[0][i] - |
| 320 |
|
|
ourmesh->mcube.cusize)*.5; |
| 321 |
greg |
2.2 |
if (ourmesh->uvlim[0][0] > ourmesh->uvlim[1][0]) { |
| 322 |
greg |
2.1 |
ourmesh->uvlim[0][0] = ourmesh->uvlim[0][1] = 0.; |
| 323 |
|
|
ourmesh->uvlim[1][0] = ourmesh->uvlim[1][1] = 0.; |
| 324 |
|
|
} else { |
| 325 |
|
|
for (i = 0; i < 2; i++) { |
| 326 |
greg |
2.7 |
double marg; /* expand past endpoints */ |
| 327 |
|
|
marg = (2./(1L<<(8*sizeof(uint16)))) * |
| 328 |
|
|
(ourmesh->uvlim[1][i] - |
| 329 |
|
|
ourmesh->uvlim[0][i]); |
| 330 |
greg |
2.1 |
ourmesh->uvlim[0][i] -= marg; |
| 331 |
|
|
ourmesh->uvlim[1][i] += marg; |
| 332 |
|
|
} |
| 333 |
|
|
} |
| 334 |
|
|
ourmesh->ldflags |= IO_BOUNDS; |
| 335 |
|
|
} |
| 336 |
|
|
|
| 337 |
|
|
|
| 338 |
|
|
static OCTREE |
| 339 |
|
|
cvmeshoct(ot) /* convert triangles in subtree */ |
| 340 |
|
|
OCTREE ot; |
| 341 |
|
|
{ |
| 342 |
|
|
int i; |
| 343 |
|
|
|
| 344 |
|
|
if (isempty(ot)) |
| 345 |
|
|
return(EMPTY); |
| 346 |
|
|
|
| 347 |
|
|
if (isfull(ot)) { |
| 348 |
|
|
OBJECT oset1[MAXSET+1]; |
| 349 |
|
|
OBJECT oset2[MAXSET+1]; |
| 350 |
|
|
objset(oset1, ot); |
| 351 |
|
|
oset2[0] = 0; |
| 352 |
|
|
for (i = oset1[0]; i > 0; i--) |
| 353 |
|
|
insertelem(oset2, cvmeshtri(oset1[i])); |
| 354 |
|
|
return(fullnode(oset2)); |
| 355 |
|
|
} |
| 356 |
|
|
|
| 357 |
|
|
for (i = 8; i--; ) |
| 358 |
|
|
octkid(ot, i) = cvmeshoct(octkid(ot, i)); |
| 359 |
|
|
return(ot); |
| 360 |
|
|
} |
| 361 |
|
|
|
| 362 |
|
|
|
| 363 |
|
|
MESH * |
| 364 |
|
|
cvmesh() /* convert mesh and octree leaf nodes */ |
| 365 |
|
|
{ |
| 366 |
|
|
if (ourmesh == NULL) |
| 367 |
|
|
return(NULL); |
| 368 |
|
|
/* convert triangles in octree nodes */ |
| 369 |
|
|
ourmesh->mcube.cutree = cvmeshoct(ourmesh->mcube.cutree); |
| 370 |
|
|
ourmesh->ldflags |= IO_SCENE|IO_TREE; |
| 371 |
|
|
|
| 372 |
|
|
return(ourmesh); |
| 373 |
|
|
} |
