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* Unpublished-- rights reserved under the copyright laws of the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