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/* Copyright (c) 1986 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 - routines for intersecting cubes with cones. |
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* |
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*/ |
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#include "standard.h" |
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#include "octree.h" |
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#include "object.h" |
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#include "cone.h" |
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#define ROOT3 1.732050808 |
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extern double mincusize; /* minimum cube size */ |
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static int findcseg(FVECT ep0, FVECT ep1, CONE *co, FVECT p); |
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o_cone(o, cu) /* determine if cone intersects cube */ |
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OBJREC *o; |
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register CUBE *cu; |
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extern int |
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o_cone( /* determine if cone intersects cube */ |
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OBJREC *o, |
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register CUBE *cu |
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) |
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{ |
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double dist2lseg(), findcseg(); |
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CONE *co; |
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FVECT ep0, ep1; |
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#ifdef STRICT |
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FVECT cumin, cumax; |
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CUBE cukid; |
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register int j; |
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#endif |
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double r; |
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FVECT p; |
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register int i, j; |
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register int i; |
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/* get cone arguments */ |
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co = getcone(o, 0); |
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/* get cube center */ |
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p[i] = cu->cuorg[i] + r; |
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r *= ROOT3; /* bounding radius for cube */ |
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if (findcseg(ep0, ep1, co, p) > 0.0) { |
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if (findcseg(ep0, ep1, co, p)) { |
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/* check min. distance to cone */ |
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if (dist2lseg(p, ep0, ep1) > (r+FTINY)*(r+FTINY)) |
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return(O_MISS); |
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} |
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double |
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findcseg(ep0, ep1, co, p) /* find line segment from cone closest to p */ |
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FVECT ep0, ep1; |
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register CONE *co; |
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FVECT p; |
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static int |
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findcseg( /* find line segment from cone closest to p */ |
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FVECT ep0, |
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FVECT ep1, |
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register CONE *co, |
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FVECT p |
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) |
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{ |
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double d; |
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FVECT v; |
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register int i; |
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/* find direction from axis to point */ |
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for (i = 0; i < 3; i++) |
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v[i] = p[i] - CO_P0(co)[i]; |
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VSUB(v, p, CO_P0(co)); |
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d = DOT(v, co->ad); |
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for (i = 0; i < 3; i++) |
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v[i] = v[i] - d*co->ad[i]; |
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d = normalize(v); |
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if (d > 0.0) /* find endpoints of segment */ |
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for (i = 0; i < 3; i++) { |
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ep0[i] = CO_R0(co)*v[i] + CO_P0(co)[i]; |
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ep1[i] = CO_R1(co)*v[i] + CO_P1(co)[i]; |
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} |
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return(d); /* return distance from axis */ |
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v[i] -= d*co->ad[i]; |
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if (normalize(v) == 0.0) |
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return(0); |
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/* find endpoints of segment */ |
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for (i = 0; i < 3; i++) { |
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ep0[i] = CO_R0(co)*v[i] + CO_P0(co)[i]; |
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ep1[i] = CO_R1(co)*v[i] + CO_P1(co)[i]; |
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} |
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return(1); /* return distance from axis */ |
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} |
