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#ifndef lint |
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static const char RCSid[] = "$Id: cvmesh.c,v 2.11 2011/02/18 19:00:43 greg Exp $"; |
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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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|
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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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#include "tmesh.h" |
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|
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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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|
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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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RREAL vc[3][2]; /* uv coords. */ |
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} TRIDATA; |
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|
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#define tdsize(fl) ((fl)&MT_UV ? sizeof(TRIDATA) : \ |
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(fl)&MT_N ? sizeof(TRIDATA)-6*sizeof(RREAL) : \ |
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sizeof(int)+sizeof(OBJECT)) |
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|
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#define OMARGIN (10*FTINY) /* margin around global cube */ |
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|
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MESH *ourmesh = NULL; /* our global mesh data structure */ |
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|
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FVECT meshbounds[2]; /* mesh bounding box */ |
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|
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static void add2bounds(FVECT vp, RREAL vc[2]); |
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static OBJECT cvmeshtri(OBJECT obj); |
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static OCTREE cvmeshoct(OCTREE ot); |
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|
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|
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|
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MESH * |
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cvinit( /* initialize empty mesh */ |
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char *nm |
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) |
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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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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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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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|
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|
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static void |
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add2bounds( /* add point and uv coordinate to bounds */ |
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FVECT vp, |
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RREAL vc[2] |
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) |
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{ |
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register int j; |
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|
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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]; |
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} |
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if (vc == NULL) |
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return; |
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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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|
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|
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int /* create an extended triangle */ |
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cvtri( |
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OBJECT mo, |
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FVECT vp1, |
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FVECT vp2, |
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FVECT vp3, |
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FVECT vn1, |
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FVECT vn2, |
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FVECT vn3, |
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RREAL vc1[2], |
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RREAL vc2[2], |
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RREAL vc3[2] |
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) |
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{ |
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static OBJECT fobj = OVOID; |
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char buf[32]; |
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int flags; |
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TRIDATA *ts; |
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FACE *f; |
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OBJREC *fop; |
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int j; |
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|
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flags = MT_V; /* check what we have */ |
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if (vn1 != NULL && vn2 != NULL && vn3 != NULL) { |
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RREAL *rp; |
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switch (flat_tri(vp1, vp2, vp3, vn1, vn2, vn3)) { |
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case ISBENT: |
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flags |= MT_N; |
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/* fall through */ |
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case ISFLAT: |
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break; |
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case RVBENT: |
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flags |= MT_N; |
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rp = vn1; vn1 = vn3; vn3 = rp; |
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/* fall through */ |
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case RVFLAT: |
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rp = vp1; vp1 = vp3; vp3 = rp; |
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rp = vc1; vc1 = vc3; vc3 = rp; |
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break; |
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case DEGEN: |
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error(WARNING, "degenerate triangle"); |
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return(0); |
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default: |
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error(INTERNAL, "bad return from flat_tri()"); |
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} |
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} |
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if (vc1 != NULL && vc2 != NULL && vc3 != NULL) |
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flags |= MT_UV; |
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if (fobj == OVOID) { /* create new triangle object */ |
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fobj = newobject(); |
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if (fobj == OVOID) |
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goto nomem; |
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fop = objptr(fobj); |
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fop->omod = mo; |
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fop->otype = OBJ_FACE; |
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sprintf(buf, "t%ld", (long)fobj); |
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fop->oname = savqstr(buf); |
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fop->oargs.nfargs = 9; |
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fop->oargs.farg = (RREAL *)malloc(9*sizeof(RREAL)); |
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if (fop->oargs.farg == NULL) |
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goto nomem; |
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} else { /* else reuse failed one */ |
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fop = objptr(fobj); |
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if (fop->otype != OBJ_FACE || fop->oargs.nfargs != 9) |
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error(CONSISTENCY, "code error 1 in cvtri"); |
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} |
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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]; |
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} |
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/* create face record */ |
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f = getface(fop); |
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if (f->area == 0.) { |
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free_os(fop); |
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return(0); |
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} |
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if (fop->os != (char *)f) |
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error(CONSISTENCY, "code error 2 in cvtri"); |
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/* follow with auxliary data */ |
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f = (FACE *)realloc((void *)f, sizeof(FACE)+tdsize(flags)); |
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if (f == NULL) |
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goto nomem; |
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fop->os = (char *)f; |
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ts = (TRIDATA *)(f+1); |
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ts->fl = flags; |
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ts->obj = OVOID; |
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if (flags & MT_N) |
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for (j = 3; j--; ) { |
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ts->vn[0][j] = vn1[j]; |
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ts->vn[1][j] = vn2[j]; |
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ts->vn[2][j] = vn3[j]; |
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} |
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if (flags & MT_UV) |
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for (j = 2; j--; ) { |
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ts->vc[0][j] = vc1[j]; |
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ts->vc[1][j] = vc2[j]; |
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ts->vc[2][j] = vc3[j]; |
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} |
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else |
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vc1 = vc2 = vc3 = NULL; |
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/* update bounds */ |
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add2bounds(vp1, vc1); |
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add2bounds(vp2, vc2); |
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add2bounds(vp3, vc3); |
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fobj = OVOID; /* we used this one */ |
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return(1); |
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nomem: |
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error(SYSTEM, "out of memory in cvtri"); |
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return(0); |
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} |
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|
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|
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static OBJECT |
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cvmeshtri( /* add an extended triangle to our mesh */ |
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OBJECT obj |
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) |
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{ |
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OBJREC *o = objptr(obj); |
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TRIDATA *ts; |
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MESHVERT vert[3]; |
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int i, j; |
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|
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if (o->otype != OBJ_FACE) |
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error(CONSISTENCY, "non-face in mesh"); |
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if (o->oargs.nfargs != 9) |
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error(CONSISTENCY, "non-triangle in mesh"); |
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if (o->os == NULL) |
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error(CONSISTENCY, "missing face record in cvmeshtri"); |
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ts = (TRIDATA *)((FACE *)o->os + 1); |
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if (ts->obj != OVOID) /* already added? */ |
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return(ts->obj); |
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vert[0].fl = vert[1].fl = vert[2].fl = ts->fl; |
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for (i = 3; i--; ) |
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for (j = 3; j--; ) |
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vert[i].v[j] = o->oargs.farg[3*i+j]; |
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if (ts->fl & MT_N) |
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for (i = 3; i--; ) |
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for (j = 3; j--; ) |
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vert[i].n[j] = ts->vn[i][j]; |
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if (ts->fl & MT_UV) |
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for (i = 3; i--; ) |
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for (j = 2; j--; ) |
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vert[i].uv[j] = ts->vc[i][j]; |
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ts->obj = addmeshtri(ourmesh, vert, o->omod); |
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if (ts->obj == OVOID) |
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error(INTERNAL, "addmeshtri failed"); |
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return(ts->obj); |
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} |
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|
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|
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void |
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cvmeshbounds(void) /* set mesh boundaries */ |
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{ |
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int i; |
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|
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if (ourmesh == NULL) |
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return; |
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/* fix coordinate bounds */ |
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for (i = 0; i < 3; i++) { |
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if (meshbounds[0][i] > meshbounds[1][i]) |
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error(USER, "no polygons in mesh"); |
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meshbounds[0][i] -= OMARGIN; |
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meshbounds[1][i] += OMARGIN; |
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if (meshbounds[1][i]-meshbounds[0][i] > ourmesh->mcube.cusize) |
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ourmesh->mcube.cusize = meshbounds[1][i] - |
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meshbounds[0][i]; |
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} |
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for (i = 0; i < 3; i++) |
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ourmesh->mcube.cuorg[i] = (meshbounds[1][i]+meshbounds[0][i] - |
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ourmesh->mcube.cusize)*.5; |
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if (ourmesh->uvlim[0][0] > ourmesh->uvlim[1][0]) { |
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ourmesh->uvlim[0][0] = ourmesh->uvlim[0][1] = 0.; |
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ourmesh->uvlim[1][0] = ourmesh->uvlim[1][1] = 0.; |
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} else { |
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for (i = 0; i < 2; i++) { |
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double marg; /* expand past endpoints */ |
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marg = (2./(1L<<(8*sizeof(uint16)))) * |
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(ourmesh->uvlim[1][i] - |
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ourmesh->uvlim[0][i]) + FTINY; |
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ourmesh->uvlim[0][i] -= marg; |
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ourmesh->uvlim[1][i] += marg; |
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} |
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} |
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ourmesh->ldflags |= IO_BOUNDS; |
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} |
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|
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|
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static OCTREE |
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cvmeshoct( /* convert triangles in subtree */ |
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OCTREE ot |
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) |
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{ |
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int i; |
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|
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if (isempty(ot)) |
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return(EMPTY); |
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|
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if (isfull(ot)) { |
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OBJECT oset1[MAXSET+1]; |
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OBJECT oset2[MAXSET+1]; |
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objset(oset1, ot); |
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oset2[0] = 0; |
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for (i = oset1[0]; i > 0; i--) |
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insertelem(oset2, cvmeshtri(oset1[i])); |
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return(fullnode(oset2)); |
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} |
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|
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for (i = 8; i--; ) |
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octkid(ot, i) = cvmeshoct(octkid(ot, i)); |
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return(ot); |
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} |
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|
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|
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MESH * |
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cvmesh(void) /* convert mesh and octree leaf nodes */ |
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{ |
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if (ourmesh == NULL) |
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return(NULL); |
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/* convert triangles in octree nodes */ |
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ourmesh->mcube.cutree = cvmeshoct(ourmesh->mcube.cutree); |
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ourmesh->ldflags |= IO_SCENE|IO_TREE; |
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|
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return(ourmesh); |
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} |
