--- ray/src/common/fvect.c 2003/02/22 02:07:22 2.6
+++ ray/src/common/fvect.c 2003/09/16 06:30:20 2.8
@@ -1,82 +1,31 @@
#ifndef lint
-static const char RCSid[] = "$Id: fvect.c,v 2.6 2003/02/22 02:07:22 greg Exp $";
+static const char RCSid[] = "$Id: fvect.c,v 2.8 2003/09/16 06:30:20 greg Exp $";
#endif
/*
* fvect.c - routines for floating-point vector calculations
*/
-/* ====================================================================
- * The Radiance Software License, Version 1.0
- *
- * Copyright (c) 1990 - 2002 The Regents of the University of California,
- * through Lawrence Berkeley National Laboratory. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes Radiance software
- * (http://radsite.lbl.gov/)
- * developed by the Lawrence Berkeley National Laboratory
- * (http://www.lbl.gov/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
- * and "The Regents of the University of California" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact radiance@radsite.lbl.gov.
- *
- * 5. Products derived from this software may not be called "Radiance",
- * nor may "Radiance" appear in their name, without prior written
- * permission of Lawrence Berkeley National Laboratory.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of Lawrence Berkeley National Laboratory. For more
- * information on Lawrence Berkeley National Laboratory, please see
- * .
- */
+#include "copyright.h"
#include
#include "fvect.h"
double
-fdot(v1, v2) /* return the dot product of two vectors */
-register FVECT v1, v2;
+fdot( /* return the dot product of two vectors */
+register FVECT v1,
+register FVECT v2
+)
{
return(DOT(v1,v2));
}
double
-dist2(p1, p2) /* return square of distance between points */
-register FVECT p1, p2;
+dist2( /* return square of distance between points */
+register FVECT p1,
+register FVECT p2
+)
{
FVECT delta;
@@ -89,9 +38,11 @@ register FVECT p1, p2;
double
-dist2line(p, ep1, ep2) /* return square of distance to line */
-FVECT p; /* the point */
-FVECT ep1, ep2; /* points on the line */
+dist2line( /* return square of distance to line */
+FVECT p, /* the point */
+FVECT ep1,
+FVECT ep2 /* points on the line */
+)
{
register double d, d1, d2;
@@ -104,9 +55,11 @@ FVECT ep1, ep2; /* points on the line */
double
-dist2lseg(p, ep1, ep2) /* return square of distance to line segment */
-FVECT p; /* the point */
-FVECT ep1, ep2; /* the end points */
+dist2lseg( /* return square of distance to line segment */
+FVECT p, /* the point */
+FVECT ep1,
+FVECT ep2 /* the end points */
+)
{
register double d, d1, d2;
@@ -128,8 +81,11 @@ FVECT ep1, ep2; /* the end points */
void
-fcross(vres, v1, v2) /* vres = v1 X v2 */
-register FVECT vres, v1, v2;
+fcross( /* vres = v1 X v2 */
+register FVECT vres,
+register FVECT v1,
+register FVECT v2
+)
{
vres[0] = v1[1]*v2[2] - v1[2]*v2[1];
vres[1] = v1[2]*v2[0] - v1[0]*v2[2];
@@ -138,9 +94,12 @@ register FVECT vres, v1, v2;
void
-fvsum(vres, v0, v1, f) /* vres = v0 + f*v1 */
-register FVECT vres, v0, v1;
-register double f;
+fvsum( /* vres = v0 + f*v1 */
+register FVECT vres,
+register FVECT v0,
+register FVECT v1,
+register double f
+)
{
vres[0] = v0[0] + f*v1[0];
vres[1] = v0[1] + f*v1[1];
@@ -149,8 +108,9 @@ register double f;
double
-normalize(v) /* normalize a vector, return old magnitude */
-register FVECT v;
+normalize( /* normalize a vector, return old magnitude */
+register FVECT v
+)
{
register double len, d;
@@ -172,10 +132,69 @@ register FVECT v;
}
+int
+closestapproach( /* closest approach of two rays */
+RREAL t[2], /* returned distances along each ray */
+FVECT rorg0, /* first origin */
+FVECT rdir0, /* first direction (normalized) */
+FVECT rorg1, /* second origin */
+FVECT rdir1 /* second direction (normalized) */
+)
+{
+ double dotprod = DOT(rdir0, rdir1);
+ double denom = 1. - dotprod*dotprod;
+ double o1o2_d1;
+ FVECT o0o1;
+
+ if (denom <= FTINY) { /* check if lines are parallel */
+ t[0] = t[1] = 0.0;
+ return(0);
+ }
+ VSUB(o0o1, rorg0, rorg1);
+ o1o2_d1 = DOT(o0o1, rdir1);
+ t[0] = (o1o2_d1*dotprod - DOT(o0o1,rdir0)) / denom;
+ t[1] = o1o2_d1 + t[0]*dotprod;
+ return(1);
+}
+
+
+#if 0
+int
+closestapproach( /* closest approach of two rays */
+RREAL t[2], /* returned distances along each ray */
+FVECT rorg0, /* first origin */
+FVECT rdir0, /* first direction (unnormalized) */
+FVECT rorg1, /* second origin */
+FVECT rdir1 /* second direction (unnormalized) */
+)
+{
+ double dotprod = DOT(rdir0, rdir1);
+ double d0n2 = DOT(rdir0, rdir0);
+ double d1n2 = DOT(rdir1, rdir1);
+ double denom = d0n2*d1n2 - dotprod*dotprod;
+ double o1o2_d1;
+ FVECT o0o1;
+
+ if (denom <= FTINY) { /* check if lines are parallel */
+ t[0] = t[1] = 0.0;
+ return(0);
+ }
+ VSUB(o0o1, rorg0, rorg1);
+ o1o2_d1 = DOT(o0o1, rdir1);
+ t[0] = (o1o2_d1*dotprod - DOT(o0o1,rdir0)*d1n2) / denom;
+ t[1] = (o1o2_d1 + t[0]*dotprod) / d1n2;
+ return(1);
+}
+#endif
+
+
void
-spinvector(vres, vorig, vnorm, theta) /* rotate vector around normal */
-FVECT vres, vorig, vnorm;
-double theta;
+spinvector( /* rotate vector around normal */
+FVECT vres, /* returned vector */
+FVECT vorig, /* original vector */
+FVECT vnorm, /* normalized vector for rotation */
+double theta /* left-hand radians */
+)
{
double sint, cost, normprod;
FVECT vperp;