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/* Copyright (c) 1990 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* o_cone.c - routine to determine ray intersection with cones. |
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* |
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* 2/13/86 |
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*/ |
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#include "ray.h" |
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#include "copyright.h" |
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#include "ray.h" |
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#include "otypes.h" |
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#include "rtotypes.h" |
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#include "cone.h" |
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o_cone(o, r) /* intersect ray with cone */ |
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OBJREC *o; |
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register RAY *r; |
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int |
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o_cone( /* intersect ray with cone */ |
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OBJREC *o, |
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RAY *r |
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) |
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{ |
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FVECT rox, rdx; |
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double a, b, c; |
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double root[2]; |
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int nroots, rn; |
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register CONE *co; |
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register int i; |
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CONE *co; |
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int i; |
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/* get cone structure */ |
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co = getcone(o, 1); |
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if (co == NULL) |
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objerror(o, INTERNAL, "unexpected illegal"); |
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/* |
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* To intersect a ray with a cone, we transform the |
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} else { /* OBJ_RING */ |
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if (rdx[2] <= FTINY && rdx[2] >= -FTINY) |
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if ((rdx[2] <= FTINY) & (rdx[2] >= -FTINY)) |
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return(0); /* parallel */ |
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root[0] = -rox[2]/rdx[2]; |
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if (root[0] <= FTINY || root[0] >= r->rot) |
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return(0); /* distance check */ |
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if (rayreject(o, r, root[0], -rdx[2])) |
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return(0); /* have better */ |
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b = root[0]*rdx[0] + rox[0]; |
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c = root[0]*rdx[1] + rox[1]; |
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a = b*b + c*c; |
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return(0); /* outside radii */ |
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r->ro = o; |
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r->rot = root[0]; |
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for (i = 0; i < 3; i++) |
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r->rop[i] = r->rorg[i] + r->rdir[i]*r->rot; |
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VSUM(r->rop, r->rorg, r->rdir, r->rot); |
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VCOPY(r->ron, co->ad); |
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r->rod = -rdx[2]; |
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r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
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r->uv[0] = r->uv[1] = 0.0; |
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r->rox = NULL; |
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return(1); /* good */ |
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} |
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for (rn = 0; rn < nroots; rn++) { /* check real roots */ |
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if (root[rn] <= FTINY) |
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continue; /* too small */ |
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if (root[rn] >= r->rot) |
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if (root[rn] > r->rot + FTINY) |
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break; /* too big */ |
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/* check endpoints */ |
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for (i = 0; i < 3; i++) { |
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rox[i] = r->rorg[i] + root[rn]*r->rdir[i]; |
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rdx[i] = rox[i] - CO_P0(co)[i]; |
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} |
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VSUM(rox, r->rorg, r->rdir, root[rn]); |
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VSUB(rdx, rox, CO_P0(co)); |
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b = DOT(rdx, co->ad); |
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if (b < 0.0) |
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continue; /* before p0 */ |
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if (b > co->al) |
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continue; /* after p1 */ |
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if (rayreject(o, r, root[rn], 0)) |
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break; /* previous hit better */ |
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r->ro = o; |
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r->rot = root[rn]; |
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VCOPY(r->rop, rox); |
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if (o->otype == OBJ_CONE || o->otype == OBJ_CUP) |
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for (i = 0; i < 3; i++) |
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r->ron[i] = (co->al*r->ron[i] - c*co->ad[i]) |
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/co->sl; |
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/ co->sl; |
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a = DOT(r->ron, r->ron); |
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if (a > 1.+FTINY || a < 1.-FTINY) { |
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c = 1./(.5 + .5*a); /* avoid numerical error */ |
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r->ron[0] *= c; r->ron[1] *= c; r->ron[2] *= c; |
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} |
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r->rod = -DOT(r->rdir, r->ron); |
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r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
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r->uv[0] = r->uv[1] = 0.0; |
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r->rox = NULL; |
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return(1); /* good */ |
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} |
