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-\documentclass{article}
-\usepackage{axiom}
-\begin{document}
-\title{\$SPAD/src/graph/view3D mesh3d.c}
-\author{The Axiom Team}
-\maketitle
-\begin{abstract}
-\end{abstract}
-\eject
-\tableofcontents
-\eject
-\section{License}
-<<license>>=
-/*
-Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd.
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
- - Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
-
- - 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.
-
- - Neither the name of The Numerical ALgorithms Group Ltd. nor the
- names of its contributors may be used to endorse or promote products
- derived from this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-IS" AND ANY EXPRESS 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 THE COPYRIGHT OWNER
-OR 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.
-*/
-@
-<<*>>=
-<<license>>
-
-#define _MESH3D_C
-#include "axiom-c-macros.h"
-
-#include <math.h>
-
-#include "header.h"
-#include "all_3d.H1"
-
-/***************************************************************************
- *** void getMeshNormal(x0,y0,z0,x1,y1,z1,x2,y2,z2,zMin,zRange,Normal); ***
- ***************************************************************************/
-
-void
-#ifdef _NO_PROTO
-getMeshNormal(x0,y0,z0,x1,y1,z1,x2,y2,z2,zMin,zRange,Normal)
- float x0,y0,z0,x1,y1,z1,x2,y2,z2,zMin,zRange,Normal[3];
-#else
-getMeshNormal(float x0,float y0,float z0,float x1,float y1,float z1,
- float x2,float y2,float z2,float zMin,float zRange,float Normal[3])
-#endif
-{
- float Ax,Ay,Az,Bx,By,Bz,
- UnitFactor;
-
- Ax = x0-x1; Ay = y0-y1; Az = z0-z1;
- Bx = x2-x1; By = y2-y1; Bz = z2-z1;
-
- /* compute cross product */
-
- Normal[0] = (Ay*Bz - Az*By);
- Normal[1] = (Az*Bx - Ax*Bz);
- Normal[2] = (Ax*By - Ay*Bx);
-
- /* normalize normal vector */
-
- UnitFactor = sqrt(Normal[0]*Normal[0] +
- Normal[1]*Normal[1] +
- Normal[2]*Normal[2]);
- if (UnitFactor > 0.0) {
- Normal[0] /= UnitFactor;
- Normal[1] /= UnitFactor;
- Normal[2] /= UnitFactor;
- } else {
- Normal[0] = 0.0;
- Normal[1] = 0.0;
- Normal[2] = 0.0;
- }
-
-} /* getMeshNormal() */
-
-
-/***********************************
- **** void normalizeVector(v) ****
- ***********************************/
-
-void
-#ifdef _NO_PROTO
-normalizeVector(v)
- float *v;
-#else
-normalizeVector(float *v)
-#endif
-{
- /* v should be a triple (ignoring the rest of the array if necessary) */
-
- float UnitFactor;
-
- UnitFactor = sqrt(v[0]*v[0] + v[1]*v[1] + v[2]*v[2]);
- if (UnitFactor != 0.0) {
- v[0] /= UnitFactor;
- v[1] /= UnitFactor;
- v[2] /= UnitFactor;
- } else {
- v[0] = v[1] = v[2] = 0.0;
- }
-
-} /* normalizeVector() */
-
-
-/************************************
- **** void dotProduct(a,b,size) ****
- ************************************/
-
-float
-#ifdef _NO_PROTO
-dotProduct(a,b,size)
- float *a,*b;
- int size;
-#else
-dotProduct(float * a,float *b,int size)
-#endif
-{
- int i;
- float f=0;
-
- for (i=0; i<size; i++)
- f += (a[i]*b[i]);
- return(f);
-
-} /* dotProduct() */
-
-@
-\eject
-\begin{thebibliography}{99}
-\bibitem{1} nothing
-\end{thebibliography}
-\end{document}