148 lines
4.4 KiB
C++
148 lines
4.4 KiB
C++
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/*
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* (c) Copyright 1993, Silicon Graphics, Inc.
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* ALL RIGHTS RESERVED
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* Permission to use, copy, modify, and distribute this software for
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* any purpose and without fee is hereby granted, provided that the above
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* copyright notice appear in all copies and that both the copyright notice
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* and this permission notice appear in supporting documentation, and that
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* the name of Silicon Graphics, Inc. not be used in advertising
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* or publicity pertaining to distribution of the software without specific,
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* written prior permission.
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*
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* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
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* AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
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* FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
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* GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
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* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
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* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
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* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
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* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
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* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
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* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* US Government Users Restricted Rights
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* Use, duplication, or disclosure by the Government is subject to
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* restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
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* (c)(1)(ii) of the Rights in Technical Data and Computer Software
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* clause at DFARS 252.227-7013 and/or in similar or successor
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* clauses in the FAR or the DOD or NASA FAR Supplement.
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* Unpublished-- rights reserved under the copyright laws of the
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* United States. Contractor/manufacturer is Silicon Graphics,
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* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
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*
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* OpenGL(TM) is a trademark of Silicon Graphics, Inc.
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*/
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#include <windows.h>
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#include <GL/gl.h>
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#include <math.h>
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#include <stdio.h>
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#ifdef WIN32
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#include "stonehen.h"
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#endif
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#define POINT_EXTERN
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#include "Point.h"
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Point Point::rotate_abouty(GLfloat c, GLfloat s)
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{
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val.pt[0] = c*pt[0] + s*pt[2];
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val.pt[1] = pt[1];
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val.pt[2] = -s*pt[0] + c*pt[2];
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return val;
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}
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Point Point::rotate_aboutz(GLfloat c, GLfloat s)
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{
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val.pt[0] = c*pt[0] - s*pt[1];
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val.pt[1] = s*pt[0] + c*pt[1];
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val.pt[2] = pt[2];
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return val;
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}
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void Point::refract_self(Point light, Point N, GLfloat I)
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{
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GLfloat t;
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Point dlight;
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dlight = refract_direction(light, N, I);
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t = -pt[2] / dlight.pt[2];
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pt[0] = pt[0] + dlight.pt[0]*t;
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pt[1] = pt[1] + dlight.pt[1]*t;
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pt[2] = 0;
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}
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Point Point::refract_direction(Point light, Point N, GLfloat I)
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{
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GLfloat cos1, sin1, cos2, sin2, m;
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GLfloat dlight[3], dN[3], axis[3];
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/* dlight = (light - *this).unit() * -1.0; */
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dlight[0] = pt[0] - light.pt[0];
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dlight[1] = pt[1] - light.pt[1];
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dlight[2] = pt[2] - light.pt[2];
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m = sqrt(dlight[0]*dlight[0] + dlight[1]*dlight[1] + dlight[2]*dlight[2]);
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dlight[0] /= m;
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dlight[1] /= m;
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dlight[2] /= m;
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// dN = N * -1.0;
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dN[0] = -N.pt[0];
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dN[1] = -N.pt[1];
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dN[2] = -N.pt[2];
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// cos1 = dN.dot(dlight);
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cos1 = dN[0]*dlight[0] + dN[1]*dlight[1] + dN[2]*dlight[2];
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if (1.0 - cos1*cos1 < point_fudge) {
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val = dN;
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return val;
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}
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// axis = ((dN * dlight) * dN).unit();
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val.pt[0] = dN[1]*dlight[2] - dlight[1]*dN[2];
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val.pt[1] = dN[2]*dlight[0] - dlight[2]*dN[0];
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val.pt[2] = dN[0]*dlight[1] - dN[1]*dlight[0];
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axis[0] = val.pt[1]*dN[2] - dN[1]*val.pt[2];
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axis[1] = val.pt[2]*dN[0] - dN[2]*val.pt[0];
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axis[2] = val.pt[0]*dN[1] - val.pt[1]*dN[0];
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m = sqrt(axis[0]*axis[0] + axis[1]*axis[1] + axis[2]*axis[2]);
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axis[0] /= m;
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axis[1] /= m;
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axis[2] /= m;
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if (axis[0]*axis[0] > point_fudge)
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sin1 = (dlight[0] - dN[0] * cos1) / axis[0];
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else if (axis[1]*axis[1] > point_fudge)
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sin1 = (dlight[1] - dN[1] * cos1) / axis[1];
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else sin1 = dlight[2] - dN[2] * cos1;
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sin2 = sin1 / I;
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cos2 = (sin1*sin1 < 1.0) ? sqrt(1.0 - sin2*sin2) : 0;
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dlight[0] = dN[0]*cos2 + axis[0]*sin2;
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dlight[1] = dN[1]*cos2 + axis[1]*sin2;
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dlight[2] = dN[2]*cos2 + axis[2]*sin2;
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/* I'm not sure this is quite legal */
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if (dlight[2] > 0.0) dlight[2] = -dlight[2];
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val = dlight;
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return val;
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}
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void Point::print()
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{
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print("%f %f %f\n");
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}
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void Point::print(const char *format)
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{
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printf(format, this->pt[0], this->pt[1], this->pt[2], 1.0);
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}
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