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greg |
2.1 |
#ifndef lint |
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static const char RCSid[] = "$Id$"; |
| 3 |
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#endif |
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/* |
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* Radiance triangle mesh conversion routines |
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*/ |
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#include "copyright.h" |
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#include "standard.h" |
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#include "cvmesh.h" |
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#include "otypes.h" |
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#include "face.h" |
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/* |
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* We need to divide faces into triangles and record auxiliary information |
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* if given (surface normal and uv coordinates). We do this by extending |
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* the face structure linked to the OBJREC os member and putting our |
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* auxiliary after it -- a bit sly, but it works. |
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*/ |
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/* Auxiliary data for triangle */ |
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typedef struct { |
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int fl; /* flags of what we're storing */ |
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OBJECT obj; /* mesh triangle ID */ |
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FVECT vn[3]; /* normals */ |
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FLOAT vc[3][2]; /* uv coords. */ |
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} TRIDATA; |
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#define tdsize(fl) ((fl)&MT_UV ? sizeof(TRIDATA) : \ |
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(fl)&MT_N ? sizeof(TRIDATA)-2*sizeof(FLOAT) : \ |
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sizeof(int)+sizeof(OBJECT)) |
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#define OMARGIN (10*FTINY) /* margin around global cube */ |
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MESH *ourmesh = NULL; /* our global mesh data structure */ |
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FVECT meshbounds[2]; /* mesh bounding box */ |
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MESH * |
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cvinit(nm) /* initialize empty mesh */ |
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char *nm; |
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{ |
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/* free old mesh, first */ |
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if (ourmesh != NULL) { |
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freemesh(ourmesh); |
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ourmesh = NULL; |
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freeobjects(0, nobjects); |
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donesets(); |
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} |
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if (nm == NULL) |
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return(NULL); |
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ourmesh = (MESH *)calloc(1, sizeof(MESH)); |
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if (ourmesh == NULL) |
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goto nomem; |
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ourmesh->name = savestr(nm); |
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ourmesh->nref = 1; |
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ourmesh->ldflags = 0; |
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ourmesh->mcube.cutree = EMPTY; |
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greg |
2.2 |
ourmesh->uvlim[0][0] = ourmesh->uvlim[0][1] = FHUGE; |
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ourmesh->uvlim[1][0] = ourmesh->uvlim[1][1] = -FHUGE; |
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greg |
2.1 |
meshbounds[0][0] = meshbounds[0][1] = meshbounds[0][2] = FHUGE; |
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meshbounds[1][0] = meshbounds[1][1] = meshbounds[1][2] = -FHUGE; |
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return(ourmesh); |
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nomem: |
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error(SYSTEM, "out of memory in cvinit"); |
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return(NULL); |
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} |
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int |
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cvpoly(n, vp, vn, vc) /* convert a polygon to extended triangles */ |
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int n; |
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FVECT *vp; |
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FVECT *vn; |
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FLOAT (*vc)[2]; |
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{ |
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int tcnt = 0; |
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int flags; |
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FLOAT *tn[3], *tc[3]; |
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int *ord; |
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int i, j; |
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if (n < 3) /* degenerate face */ |
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return(0); |
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flags = MT_V; |
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if (vn != NULL) { |
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tn[0] = vn[0]; tn[1] = vn[1]; tn[2] = vn[2]; |
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flags |= MT_N; |
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} else { |
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tn[0] = tn[1] = tn[2] = NULL; |
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} |
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if (vc != NULL) { |
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tc[0] = vc[0]; tc[1] = vc[1]; tc[2] = vc[2]; |
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flags |= MT_UV; |
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} else { |
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tc[0] = tc[1] = tc[2] = NULL; |
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} |
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if (n == 3) /* output single triangle */ |
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return(cvtri(vp[0], vp[1], vp[2], |
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tn[0], tn[1], tn[2], |
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tc[0], tc[1], tc[2])); |
| 103 |
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| 104 |
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/* decimate polygon (assumes convex) */ |
| 105 |
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ord = (int *)malloc(n*sizeof(int)); |
| 106 |
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if (ord == NULL) |
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error(SYSTEM, "out of memory in cvpoly"); |
| 108 |
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for (i = n; i--; ) |
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ord[i] = i; |
| 110 |
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while (n >= 3) { |
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if (flags & MT_N) |
| 112 |
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for (i = 3; i--; ) |
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tn[i] = vn[ord[i]]; |
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if (flags & MT_UV) |
| 115 |
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for (i = 3; i--; ) |
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tc[i] = vc[ord[i]]; |
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i = cvtri(vp[ord[0]], vp[ord[1]], vp[ord[2]], |
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tn[0], tn[1], tn[2], |
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tc[0], tc[1], tc[2]); |
| 120 |
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if (i < 0) |
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return(i); |
| 122 |
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tcnt += i; |
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/* remove vertex and rotate */ |
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n--; |
| 125 |
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j = ord[0]; |
| 126 |
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for (i = 0; i < n-1; i++) |
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ord[i] = ord[i+2]; |
| 128 |
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ord[i] = j; |
| 129 |
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} |
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free((void *)ord); |
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return(tcnt); |
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} |
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static void |
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add2bounds(vp, vc) /* add point and uv coordinate to bounds */ |
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FVECT vp; |
| 138 |
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FLOAT vc[2]; |
| 139 |
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{ |
| 140 |
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register int j; |
| 141 |
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| 142 |
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for (j = 3; j--; ) { |
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if (vp[j] < meshbounds[0][j]) |
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meshbounds[0][j] = vp[j]; |
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if (vp[j] > meshbounds[1][j]) |
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meshbounds[1][j] = vp[j]; |
| 147 |
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} |
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if (vc == NULL) |
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return; |
| 150 |
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for (j = 2; j--; ) { |
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if (vc[j] < ourmesh->uvlim[0][j]) |
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ourmesh->uvlim[0][j] = vc[j]; |
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if (vc[j] > ourmesh->uvlim[1][j]) |
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ourmesh->uvlim[1][j] = vc[j]; |
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} |
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} |
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int /* create an extended triangle */ |
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cvtri(vp1, vp2, vp3, vn1, vn2, vn3, vc1, vc2, vc3) |
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FVECT vp1, vp2, vp3; |
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FVECT vn1, vn2, vn3; |
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FLOAT vc1[2], vc2[2], vc3[2]; |
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{ |
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char buf[32]; |
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int flags; |
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TRIDATA *ts; |
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OBJECT fobj; |
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FACE *f; |
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OBJREC *fop; |
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int j; |
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flags = MT_V; |
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if (vn1 != NULL && vn2 != NULL && vn3 != NULL) |
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flags |= MT_N; |
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if (vc1 != NULL && vc2 != NULL && vc3 != NULL) |
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flags |= MT_UV; |
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/* create extended triangle */ |
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fobj = newobject(); |
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if (fobj == OVOID) |
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return(-1); |
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fop = objptr(fobj); |
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fop->omod = OVOID; |
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fop->otype = OBJ_FACE; |
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sprintf(buf, "t%d", fobj); |
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fop->oname = savqstr(buf); |
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fop->oargs.nfargs = 9; |
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fop->oargs.farg = (FLOAT *)malloc(9*sizeof(FLOAT)); |
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if (fop->oargs.farg == NULL) |
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goto nomem; |
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for (j = 3; j--; ) { |
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fop->oargs.farg[j] = vp1[j]; |
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fop->oargs.farg[3+j] = vp2[j]; |
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fop->oargs.farg[6+j] = vp3[j]; |
| 195 |
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} |
| 196 |
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/* create face record */ |
| 197 |
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if ((f = getface(fop)) == NULL || f->area == 0.) { |
| 198 |
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freeobjects(fobj, 1); |
| 199 |
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return(0); |
| 200 |
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} |
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if (fop->os != (char *)f) |
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error(CONSISTENCY, "code error in cvtri"); |
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/* follow with auxliary data */ |
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f = (FACE *)realloc((void *)f, sizeof(FACE)+tdsize(flags)); |
| 205 |
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if (f == NULL) |
| 206 |
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goto nomem; |
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fop->os = (char *)f; |
| 208 |
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ts = (TRIDATA *)(f+1); |
| 209 |
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ts->fl = flags; |
| 210 |
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ts->obj = OVOID; |
| 211 |
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if (flags & MT_N) |
| 212 |
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for (j = 3; j--; ) { |
| 213 |
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ts->vn[0][j] = vn1[j]; |
| 214 |
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ts->vn[1][j] = vn2[j]; |
| 215 |
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ts->vn[2][j] = vn3[j]; |
| 216 |
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} |
| 217 |
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if (flags & MT_UV) |
| 218 |
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for (j = 2; j--; ) { |
| 219 |
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ts->vc[0][j] = vc1[j]; |
| 220 |
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ts->vc[1][j] = vc2[j]; |
| 221 |
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ts->vc[2][j] = vc3[j]; |
| 222 |
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} |
| 223 |
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else |
| 224 |
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vc1 = vc2 = vc3 = NULL; |
| 225 |
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/* update bounds */ |
| 226 |
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add2bounds(vp1, vc1); |
| 227 |
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add2bounds(vp2, vc2); |
| 228 |
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add2bounds(vp3, vc3); |
| 229 |
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return(1); |
| 230 |
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nomem: |
| 231 |
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error(SYSTEM, "out of memory in cvtri"); |
| 232 |
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return(0); |
| 233 |
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} |
| 234 |
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| 235 |
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| 236 |
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static OBJECT |
| 237 |
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cvmeshtri(obj) /* add an extended triangle to our mesh */ |
| 238 |
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OBJECT obj; |
| 239 |
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{ |
| 240 |
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OBJREC *o = objptr(obj); |
| 241 |
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TRIDATA *ts; |
| 242 |
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MESHVERT vert[3]; |
| 243 |
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int i, j; |
| 244 |
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| 245 |
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if (o->otype != OBJ_FACE) |
| 246 |
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error(CONSISTENCY, "non-face in mesh"); |
| 247 |
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if (o->oargs.nfargs != 9) |
| 248 |
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error(CONSISTENCY, "non-triangle in mesh"); |
| 249 |
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if (o->os == NULL) |
| 250 |
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error(CONSISTENCY, "missing face record in cvmeshtri"); |
| 251 |
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ts = (TRIDATA *)((FACE *)o->os + 1); |
| 252 |
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if (ts->obj != OVOID) /* already added? */ |
| 253 |
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return(ts->obj); |
| 254 |
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vert[0].fl = vert[1].fl = vert[2].fl = ts->fl; |
| 255 |
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for (i = 3; i--; ) |
| 256 |
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for (j = 3; j--; ) |
| 257 |
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vert[i].v[j] = o->oargs.farg[3*i+j]; |
| 258 |
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if (ts->fl & MT_N) |
| 259 |
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for (i = 3; i--; ) |
| 260 |
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for (j = 3; j--; ) |
| 261 |
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vert[i].n[j] = ts->vn[i][j]; |
| 262 |
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if (ts->fl & MT_UV) |
| 263 |
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for (i = 3; i--; ) |
| 264 |
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for (j = 2; j--; ) |
| 265 |
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vert[i].uv[j] = ts->vc[i][j]; |
| 266 |
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ts->obj = addmeshtri(ourmesh, vert); |
| 267 |
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if (ts->obj == OVOID) |
| 268 |
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error(INTERNAL, "addmeshtri failed"); |
| 269 |
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return(ts->obj); |
| 270 |
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} |
| 271 |
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| 272 |
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| 273 |
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void |
| 274 |
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cvmeshbounds() /* set mesh boundaries */ |
| 275 |
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{ |
| 276 |
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int i; |
| 277 |
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| 278 |
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if (ourmesh == NULL) |
| 279 |
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return; |
| 280 |
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/* fix coordinate bounds */ |
| 281 |
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for (i = 0; i < 3; i++) { |
| 282 |
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if (meshbounds[0][i] >= meshbounds[1][i]) |
| 283 |
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error(USER, "no polygons in mesh"); |
| 284 |
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meshbounds[0][i] -= OMARGIN; |
| 285 |
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meshbounds[1][i] += OMARGIN; |
| 286 |
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if (meshbounds[1][i]-meshbounds[0][i] > ourmesh->mcube.cusize) |
| 287 |
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ourmesh->mcube.cusize = meshbounds[1][i] - |
| 288 |
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meshbounds[0][i]; |
| 289 |
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} |
| 290 |
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for (i = 0; i < 3; i++) |
| 291 |
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ourmesh->mcube.cuorg[i] = (meshbounds[1][i]+meshbounds[0][i] - |
| 292 |
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ourmesh->mcube.cusize)*.5; |
| 293 |
greg |
2.2 |
if (ourmesh->uvlim[0][0] > ourmesh->uvlim[1][0]) { |
| 294 |
greg |
2.1 |
ourmesh->uvlim[0][0] = ourmesh->uvlim[0][1] = 0.; |
| 295 |
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ourmesh->uvlim[1][0] = ourmesh->uvlim[1][1] = 0.; |
| 296 |
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} else { |
| 297 |
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for (i = 0; i < 2; i++) { |
| 298 |
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double marg; |
| 299 |
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marg = 1e-6*(ourmesh->uvlim[1][i] - |
| 300 |
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ourmesh->uvlim[0][i]); |
| 301 |
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ourmesh->uvlim[0][i] -= marg; |
| 302 |
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ourmesh->uvlim[1][i] += marg; |
| 303 |
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} |
| 304 |
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} |
| 305 |
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ourmesh->ldflags |= IO_BOUNDS; |
| 306 |
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} |
| 307 |
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| 308 |
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| 309 |
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static OCTREE |
| 310 |
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cvmeshoct(ot) /* convert triangles in subtree */ |
| 311 |
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OCTREE ot; |
| 312 |
|
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{ |
| 313 |
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int i; |
| 314 |
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| 315 |
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if (isempty(ot)) |
| 316 |
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return(EMPTY); |
| 317 |
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| 318 |
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if (isfull(ot)) { |
| 319 |
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OBJECT oset1[MAXSET+1]; |
| 320 |
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OBJECT oset2[MAXSET+1]; |
| 321 |
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objset(oset1, ot); |
| 322 |
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oset2[0] = 0; |
| 323 |
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for (i = oset1[0]; i > 0; i--) |
| 324 |
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insertelem(oset2, cvmeshtri(oset1[i])); |
| 325 |
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return(fullnode(oset2)); |
| 326 |
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} |
| 327 |
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| 328 |
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for (i = 8; i--; ) |
| 329 |
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octkid(ot, i) = cvmeshoct(octkid(ot, i)); |
| 330 |
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return(ot); |
| 331 |
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} |
| 332 |
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| 333 |
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| 334 |
|
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MESH * |
| 335 |
|
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cvmesh() /* convert mesh and octree leaf nodes */ |
| 336 |
|
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{ |
| 337 |
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if (ourmesh == NULL) |
| 338 |
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return(NULL); |
| 339 |
|
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/* convert triangles in octree nodes */ |
| 340 |
|
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ourmesh->mcube.cutree = cvmeshoct(ourmesh->mcube.cutree); |
| 341 |
|
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ourmesh->ldflags |= IO_SCENE|IO_TREE; |
| 342 |
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| 343 |
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return(ourmesh); |
| 344 |
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} |
