4
* Freeglut geometry rendering methods.
6
* Copyright (c) 1999-2000 Pawel W. Olszta. All Rights Reserved.
7
* Written by Pawel W. Olszta, <olszta@sourceforge.net>
8
* Creation date: Fri Dec 3 1999
10
* Permission is hereby granted, free of charge, to any person obtaining a
11
* copy of this software and associated documentation files (the "Software"),
12
* to deal in the Software without restriction, including without limitation
13
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
14
* and/or sell copies of the Software, and to permit persons to whom the
15
* Software is furnished to do so, subject to the following conditions:
17
* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
20
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
21
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* PAWEL W. OLSZTA BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
25
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
29
#include "freeglut_internal.h"
32
* TODO BEFORE THE STABLE RELEASE:
34
* Following functions have been contributed by Andreas Umbach.
36
* glutWireCube() -- looks OK
37
* glutSolidCube() -- OK
39
* Those functions have been implemented by John Fay.
41
* glutWireTorus() -- looks OK
42
* glutSolidTorus() -- looks OK
43
* glutWireDodecahedron() -- looks OK
44
* glutSolidDodecahedron() -- looks OK
45
* glutWireOctahedron() -- looks OK
46
* glutSolidOctahedron() -- looks OK
47
* glutWireTetrahedron() -- looks OK
48
* glutSolidTetrahedron() -- looks OK
49
* glutWireIcosahedron() -- looks OK
50
* glutSolidIcosahedron() -- looks OK
52
* The Following functions have been updated by Nigel Stewart, based
53
* on FreeGLUT 2.0.0 implementations:
55
* glutWireSphere() -- looks OK
56
* glutSolidSphere() -- looks OK
57
* glutWireCone() -- looks OK
58
* glutSolidCone() -- looks OK
62
/* -- INTERFACE FUNCTIONS -------------------------------------------------- */
65
* Draws a wireframed cube. Code contributed by Andreas Umbach <marvin@dataway.ch>
67
void FGAPIENTRY glutWireCube( GLdouble dSize )
69
double size = dSize * 0.5;
71
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCube" );
73
# define V(a,b,c) glVertex3d( a size, b size, c size );
74
# define N(a,b,c) glNormal3d( a, b, c );
76
/* PWO: I dared to convert the code to use macros... */
77
glBegin( GL_LINE_LOOP ); N( 1.0, 0.0, 0.0); V(+,-,+); V(+,-,-); V(+,+,-); V(+,+,+); glEnd();
78
glBegin( GL_LINE_LOOP ); N( 0.0, 1.0, 0.0); V(+,+,+); V(+,+,-); V(-,+,-); V(-,+,+); glEnd();
79
glBegin( GL_LINE_LOOP ); N( 0.0, 0.0, 1.0); V(+,+,+); V(-,+,+); V(-,-,+); V(+,-,+); glEnd();
80
glBegin( GL_LINE_LOOP ); N(-1.0, 0.0, 0.0); V(-,-,+); V(-,+,+); V(-,+,-); V(-,-,-); glEnd();
81
glBegin( GL_LINE_LOOP ); N( 0.0,-1.0, 0.0); V(-,-,+); V(-,-,-); V(+,-,-); V(+,-,+); glEnd();
82
glBegin( GL_LINE_LOOP ); N( 0.0, 0.0,-1.0); V(-,-,-); V(-,+,-); V(+,+,-); V(+,-,-); glEnd();
89
* Draws a solid cube. Code contributed by Andreas Umbach <marvin@dataway.ch>
91
void FGAPIENTRY glutSolidCube( GLdouble dSize )
93
double size = dSize * 0.5;
95
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCube" );
97
# define V(a,b,c) glVertex3d( a size, b size, c size );
98
# define N(a,b,c) glNormal3d( a, b, c );
100
/* PWO: Again, I dared to convert the code to use macros... */
102
N( 1.0, 0.0, 0.0); V(+,-,+); V(+,-,-); V(+,+,-); V(+,+,+);
103
N( 0.0, 1.0, 0.0); V(+,+,+); V(+,+,-); V(-,+,-); V(-,+,+);
104
N( 0.0, 0.0, 1.0); V(+,+,+); V(-,+,+); V(-,-,+); V(+,-,+);
105
N(-1.0, 0.0, 0.0); V(-,-,+); V(-,+,+); V(-,+,-); V(-,-,-);
106
N( 0.0,-1.0, 0.0); V(-,-,+); V(-,-,-); V(+,-,-); V(+,-,+);
107
N( 0.0, 0.0,-1.0); V(-,-,-); V(-,+,-); V(+,+,-); V(+,-,-);
115
* Compute lookup table of cos and sin values forming a cirle
118
* It is the responsibility of the caller to free these tables
119
* The size of the table is (n+1) to form a connected loop
120
* The last entry is exactly the same as the first
121
* The sign of n can be flipped to get the reverse loop
124
static void fghCircleTable(double **sint,double **cost,const int n)
128
/* Table size, the sign of n flips the circle direction */
130
const int size = abs(n);
132
/* Determine the angle between samples */
134
const double angle = 2*M_PI/(double)( ( n == 0 ) ? 1 : n );
136
/* Allocate memory for n samples, plus duplicate of first entry at the end */
138
*sint = (double *) calloc(sizeof(double), size+1);
139
*cost = (double *) calloc(sizeof(double), size+1);
141
/* Bail out if memory allocation fails, fgError never returns */
143
if (!(*sint) || !(*cost))
147
fgError("Failed to allocate memory in fghCircleTable");
150
/* Compute cos and sin around the circle */
155
for (i=1; i<size; i++)
157
(*sint)[i] = sin(angle*i);
158
(*cost)[i] = cos(angle*i);
161
/* Last sample is duplicate of the first */
163
(*sint)[size] = (*sint)[0];
164
(*cost)[size] = (*cost)[0];
168
* Draws a solid sphere
170
void FGAPIENTRY glutSolidSphere(GLdouble radius, GLint slices, GLint stacks)
174
/* Adjust z and radius as stacks are drawn. */
179
/* Pre-computed circle */
181
double *sint1,*cost1;
182
double *sint2,*cost2;
184
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidSphere" );
186
fghCircleTable(&sint1,&cost1,-slices);
187
fghCircleTable(&sint2,&cost2,stacks*2);
189
/* The top stack is covered with a triangle fan */
192
z1 = cost2[(stacks>0)?1:0];
194
r1 = sint2[(stacks>0)?1:0];
196
glBegin(GL_TRIANGLE_FAN);
199
glVertex3d(0,0,radius);
201
for (j=slices; j>=0; j--)
203
glNormal3d(cost1[j]*r1, sint1[j]*r1, z1 );
204
glVertex3d(cost1[j]*r1*radius, sint1[j]*r1*radius, z1*radius);
209
/* Cover each stack with a quad strip, except the top and bottom stacks */
211
for( i=1; i<stacks-1; i++ )
213
z0 = z1; z1 = cost2[i+1];
214
r0 = r1; r1 = sint2[i+1];
216
glBegin(GL_QUAD_STRIP);
218
for(j=0; j<=slices; j++)
220
glNormal3d(cost1[j]*r1, sint1[j]*r1, z1 );
221
glVertex3d(cost1[j]*r1*radius, sint1[j]*r1*radius, z1*radius);
222
glNormal3d(cost1[j]*r0, sint1[j]*r0, z0 );
223
glVertex3d(cost1[j]*r0*radius, sint1[j]*r0*radius, z0*radius);
229
/* The bottom stack is covered with a triangle fan */
234
glBegin(GL_TRIANGLE_FAN);
237
glVertex3d(0,0,-radius);
239
for (j=0; j<=slices; j++)
241
glNormal3d(cost1[j]*r0, sint1[j]*r0, z0 );
242
glVertex3d(cost1[j]*r0*radius, sint1[j]*r0*radius, z0*radius);
247
/* Release sin and cos tables */
256
* Draws a wire sphere
258
void FGAPIENTRY glutWireSphere(GLdouble radius, GLint slices, GLint stacks)
262
/* Adjust z and radius as stacks and slices are drawn. */
267
/* Pre-computed circle */
269
double *sint1,*cost1;
270
double *sint2,*cost2;
272
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireSphere" );
274
fghCircleTable(&sint1,&cost1,-slices );
275
fghCircleTable(&sint2,&cost2, stacks*2);
277
/* Draw a line loop for each stack */
279
for (i=1; i<stacks; i++)
284
glBegin(GL_LINE_LOOP);
286
for(j=0; j<=slices; j++)
292
glVertex3d(x*r*radius,y*r*radius,z*radius);
298
/* Draw a line loop for each slice */
300
for (i=0; i<slices; i++)
302
glBegin(GL_LINE_STRIP);
304
for(j=0; j<=stacks; j++)
306
x = cost1[i]*sint2[j];
307
y = sint1[i]*sint2[j];
311
glVertex3d(x*radius,y*radius,z*radius);
317
/* Release sin and cos tables */
328
void FGAPIENTRY glutSolidCone( GLdouble base, GLdouble height, GLint slices, GLint stacks )
332
/* Step in z and radius as stacks are drawn. */
337
const double zStep = height / ( ( stacks > 0 ) ? stacks : 1 );
338
const double rStep = base / ( ( stacks > 0 ) ? stacks : 1 );
340
/* Scaling factors for vertex normals */
342
const double cosn = ( height / sqrt ( height * height + base * base ));
343
const double sinn = ( base / sqrt ( height * height + base * base ));
345
/* Pre-computed circle */
349
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCone" );
351
fghCircleTable(&sint,&cost,-slices);
353
/* Cover the circular base with a triangle fan... */
361
glBegin(GL_TRIANGLE_FAN);
363
glNormal3d(0.0,0.0,-1.0);
364
glVertex3d(0.0,0.0, z0 );
366
for (j=0; j<=slices; j++)
367
glVertex3d(cost[j]*r0, sint[j]*r0, z0);
371
/* Cover each stack with a quad strip, except the top stack */
373
for( i=0; i<stacks-1; i++ )
375
glBegin(GL_QUAD_STRIP);
377
for(j=0; j<=slices; j++)
379
glNormal3d(cost[j]*sinn, sint[j]*sinn, cosn);
380
glVertex3d(cost[j]*r0, sint[j]*r0, z0 );
381
glVertex3d(cost[j]*r1, sint[j]*r1, z1 );
384
z0 = z1; z1 += zStep;
385
r0 = r1; r1 -= rStep;
390
/* The top stack is covered with individual triangles */
392
glBegin(GL_TRIANGLES);
394
glNormal3d(cost[0]*sinn, sint[0]*sinn, cosn);
396
for (j=0; j<slices; j++)
398
glVertex3d(cost[j+0]*r0, sint[j+0]*r0, z0 );
399
glVertex3d(0, 0, height);
400
glNormal3d(cost[j+1]*sinn, sint[j+1]*sinn, cosn );
401
glVertex3d(cost[j+1]*r0, sint[j+1]*r0, z0 );
406
/* Release sin and cos tables */
415
void FGAPIENTRY glutWireCone( GLdouble base, GLdouble height, GLint slices, GLint stacks)
419
/* Step in z and radius as stacks are drawn. */
424
const double zStep = height / ( ( stacks > 0 ) ? stacks : 1 );
425
const double rStep = base / ( ( stacks > 0 ) ? stacks : 1 );
427
/* Scaling factors for vertex normals */
429
const double cosn = ( height / sqrt ( height * height + base * base ));
430
const double sinn = ( base / sqrt ( height * height + base * base ));
432
/* Pre-computed circle */
436
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCone" );
438
fghCircleTable(&sint,&cost,-slices);
440
/* Draw the stacks... */
442
for (i=0; i<stacks; i++)
444
glBegin(GL_LINE_LOOP);
446
for( j=0; j<slices; j++ )
448
glNormal3d(cost[j]*sinn, sint[j]*sinn, cosn);
449
glVertex3d(cost[j]*r, sint[j]*r, z );
458
/* Draw the slices */
464
for (j=0; j<slices; j++)
466
glNormal3d(cost[j]*sinn, sint[j]*sinn, cosn );
467
glVertex3d(cost[j]*r, sint[j]*r, 0.0 );
468
glVertex3d(0.0, 0.0, height);
473
/* Release sin and cos tables */
481
* Draws a solid cylinder
483
void FGAPIENTRY glutSolidCylinder(GLdouble radius, GLdouble height, GLint slices, GLint stacks)
487
/* Step in z and radius as stacks are drawn. */
490
const double zStep = height / ( ( stacks > 0 ) ? stacks : 1 );
492
/* Pre-computed circle */
496
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCylinder" );
498
fghCircleTable(&sint,&cost,-slices);
500
/* Cover the base and top */
502
glBegin(GL_TRIANGLE_FAN);
503
glNormal3d(0.0, 0.0, -1.0 );
504
glVertex3d(0.0, 0.0, 0.0 );
505
for (j=0; j<=slices; j++)
506
glVertex3d(cost[j]*radius, sint[j]*radius, 0.0);
509
glBegin(GL_TRIANGLE_FAN);
510
glNormal3d(0.0, 0.0, 1.0 );
511
glVertex3d(0.0, 0.0, height);
512
for (j=slices; j>=0; j--)
513
glVertex3d(cost[j]*radius, sint[j]*radius, height);
521
for (i=1; i<=stacks; i++)
526
glBegin(GL_QUAD_STRIP);
527
for (j=0; j<=slices; j++ )
529
glNormal3d(cost[j], sint[j], 0.0 );
530
glVertex3d(cost[j]*radius, sint[j]*radius, z0 );
531
glVertex3d(cost[j]*radius, sint[j]*radius, z1 );
535
z0 = z1; z1 += zStep;
538
/* Release sin and cos tables */
545
* Draws a wire cylinder
547
void FGAPIENTRY glutWireCylinder(GLdouble radius, GLdouble height, GLint slices, GLint stacks)
551
/* Step in z and radius as stacks are drawn. */
554
const double zStep = height / ( ( stacks > 0 ) ? stacks : 1 );
556
/* Pre-computed circle */
560
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCylinder" );
562
fghCircleTable(&sint,&cost,-slices);
564
/* Draw the stacks... */
566
for (i=0; i<=stacks; i++)
571
glBegin(GL_LINE_LOOP);
573
for( j=0; j<slices; j++ )
575
glNormal3d(cost[j], sint[j], 0.0);
576
glVertex3d(cost[j]*radius, sint[j]*radius, z );
584
/* Draw the slices */
588
for (j=0; j<slices; j++)
590
glNormal3d(cost[j], sint[j], 0.0 );
591
glVertex3d(cost[j]*radius, sint[j]*radius, 0.0 );
592
glVertex3d(cost[j]*radius, sint[j]*radius, height);
597
/* Release sin and cos tables */
606
void FGAPIENTRY glutWireTorus( GLdouble dInnerRadius, GLdouble dOuterRadius, GLint nSides, GLint nRings )
608
double iradius = dInnerRadius, oradius = dOuterRadius, phi, psi, dpsi, dphi;
609
double *vertex, *normal;
611
double spsi, cpsi, sphi, cphi ;
613
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireTorus" );
615
if ( nSides < 1 ) nSides = 1;
616
if ( nRings < 1 ) nRings = 1;
618
/* Allocate the vertices array */
619
vertex = (double *)calloc( sizeof(double), 3 * nSides * nRings );
620
normal = (double *)calloc( sizeof(double), 3 * nSides * nRings );
624
dpsi = 2.0 * M_PI / (double)nRings ;
625
dphi = -2.0 * M_PI / (double)nSides ;
628
for( j=0; j<nRings; j++ )
634
for( i=0; i<nSides; i++ )
636
int offset = 3 * ( j * nSides + i ) ;
639
*(vertex + offset + 0) = cpsi * ( oradius + cphi * iradius ) ;
640
*(vertex + offset + 1) = spsi * ( oradius + cphi * iradius ) ;
641
*(vertex + offset + 2) = sphi * iradius ;
642
*(normal + offset + 0) = cpsi * cphi ;
643
*(normal + offset + 1) = spsi * cphi ;
644
*(normal + offset + 2) = sphi ;
651
for( i=0; i<nSides; i++ )
653
glBegin( GL_LINE_LOOP );
655
for( j=0; j<nRings; j++ )
657
int offset = 3 * ( j * nSides + i ) ;
658
glNormal3dv( normal + offset );
659
glVertex3dv( vertex + offset );
665
for( j=0; j<nRings; j++ )
667
glBegin(GL_LINE_LOOP);
669
for( i=0; i<nSides; i++ )
671
int offset = 3 * ( j * nSides + i ) ;
672
glNormal3dv( normal + offset );
673
glVertex3dv( vertex + offset );
685
* Draws a solid torus
687
void FGAPIENTRY glutSolidTorus( GLdouble dInnerRadius, GLdouble dOuterRadius, GLint nSides, GLint nRings )
689
double iradius = dInnerRadius, oradius = dOuterRadius, phi, psi, dpsi, dphi;
690
double *vertex, *normal;
692
double spsi, cpsi, sphi, cphi ;
694
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidTorus" );
696
if ( nSides < 1 ) nSides = 1;
697
if ( nRings < 1 ) nRings = 1;
699
/* Increment the number of sides and rings to allow for one more point than surface */
703
/* Allocate the vertices array */
704
vertex = (double *)calloc( sizeof(double), 3 * nSides * nRings );
705
normal = (double *)calloc( sizeof(double), 3 * nSides * nRings );
709
dpsi = 2.0 * M_PI / (double)(nRings - 1) ;
710
dphi = -2.0 * M_PI / (double)(nSides - 1) ;
713
for( j=0; j<nRings; j++ )
719
for( i=0; i<nSides; i++ )
721
int offset = 3 * ( j * nSides + i ) ;
724
*(vertex + offset + 0) = cpsi * ( oradius + cphi * iradius ) ;
725
*(vertex + offset + 1) = spsi * ( oradius + cphi * iradius ) ;
726
*(vertex + offset + 2) = sphi * iradius ;
727
*(normal + offset + 0) = cpsi * cphi ;
728
*(normal + offset + 1) = spsi * cphi ;
729
*(normal + offset + 2) = sphi ;
737
for( i=0; i<nSides-1; i++ )
739
for( j=0; j<nRings-1; j++ )
741
int offset = 3 * ( j * nSides + i ) ;
742
glNormal3dv( normal + offset );
743
glVertex3dv( vertex + offset );
744
glNormal3dv( normal + offset + 3 );
745
glVertex3dv( vertex + offset + 3 );
746
glNormal3dv( normal + offset + 3 * nSides + 3 );
747
glVertex3dv( vertex + offset + 3 * nSides + 3 );
748
glNormal3dv( normal + offset + 3 * nSides );
749
glVertex3dv( vertex + offset + 3 * nSides );
763
void FGAPIENTRY glutWireDodecahedron( void )
765
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireDodecahedron" );
767
/* Magic Numbers: It is possible to create a dodecahedron by attaching two pentagons to each face of
768
* of a cube. The coordinates of the points are:
769
* (+-x,0, z); (+-1, 1, 1); (0, z, x )
770
* where x = (-1 + sqrt(5))/2, z = (1 + sqrt(5))/2 or
771
* x = 0.61803398875 and z = 1.61803398875.
773
glBegin ( GL_LINE_LOOP ) ;
774
glNormal3d ( 0.0, 0.525731112119, 0.850650808354 ) ; glVertex3d ( 0.0, 1.61803398875, 0.61803398875 ) ; glVertex3d ( -1.0, 1.0, 1.0 ) ; glVertex3d ( -0.61803398875, 0.0, 1.61803398875 ) ; glVertex3d ( 0.61803398875, 0.0, 1.61803398875 ) ; glVertex3d ( 1.0, 1.0, 1.0 ) ;
776
glBegin ( GL_LINE_LOOP ) ;
777
glNormal3d ( 0.0, 0.525731112119, -0.850650808354 ) ; glVertex3d ( 0.0, 1.61803398875, -0.61803398875 ) ; glVertex3d ( 1.0, 1.0, -1.0 ) ; glVertex3d ( 0.61803398875, 0.0, -1.61803398875 ) ; glVertex3d ( -0.61803398875, 0.0, -1.61803398875 ) ; glVertex3d ( -1.0, 1.0, -1.0 ) ;
779
glBegin ( GL_LINE_LOOP ) ;
780
glNormal3d ( 0.0, -0.525731112119, 0.850650808354 ) ; glVertex3d ( 0.0, -1.61803398875, 0.61803398875 ) ; glVertex3d ( 1.0, -1.0, 1.0 ) ; glVertex3d ( 0.61803398875, 0.0, 1.61803398875 ) ; glVertex3d ( -0.61803398875, 0.0, 1.61803398875 ) ; glVertex3d ( -1.0, -1.0, 1.0 ) ;
782
glBegin ( GL_LINE_LOOP ) ;
783
glNormal3d ( 0.0, -0.525731112119, -0.850650808354 ) ; glVertex3d ( 0.0, -1.61803398875, -0.61803398875 ) ; glVertex3d ( -1.0, -1.0, -1.0 ) ; glVertex3d ( -0.61803398875, 0.0, -1.61803398875 ) ; glVertex3d ( 0.61803398875, 0.0, -1.61803398875 ) ; glVertex3d ( 1.0, -1.0, -1.0 ) ;
786
glBegin ( GL_LINE_LOOP ) ;
787
glNormal3d ( 0.850650808354, 0.0, 0.525731112119 ) ; glVertex3d ( 0.61803398875, 0.0, 1.61803398875 ) ; glVertex3d ( 1.0, -1.0, 1.0 ) ; glVertex3d ( 1.61803398875, -0.61803398875, 0.0 ) ; glVertex3d ( 1.61803398875, 0.61803398875, 0.0 ) ; glVertex3d ( 1.0, 1.0, 1.0 ) ;
789
glBegin ( GL_LINE_LOOP ) ;
790
glNormal3d ( -0.850650808354, 0.0, 0.525731112119 ) ; glVertex3d ( -0.61803398875, 0.0, 1.61803398875 ) ; glVertex3d ( -1.0, 1.0, 1.0 ) ; glVertex3d ( -1.61803398875, 0.61803398875, 0.0 ) ; glVertex3d ( -1.61803398875, -0.61803398875, 0.0 ) ; glVertex3d ( -1.0, -1.0, 1.0 ) ;
792
glBegin ( GL_LINE_LOOP ) ;
793
glNormal3d ( 0.850650808354, 0.0, -0.525731112119 ) ; glVertex3d ( 0.61803398875, 0.0, -1.61803398875 ) ; glVertex3d ( 1.0, 1.0, -1.0 ) ; glVertex3d ( 1.61803398875, 0.61803398875, 0.0 ) ; glVertex3d ( 1.61803398875, -0.61803398875, 0.0 ) ; glVertex3d ( 1.0, -1.0, -1.0 ) ;
795
glBegin ( GL_LINE_LOOP ) ;
796
glNormal3d ( -0.850650808354, 0.0, -0.525731112119 ) ; glVertex3d ( -0.61803398875, 0.0, -1.61803398875 ) ; glVertex3d ( -1.0, -1.0, -1.0 ) ; glVertex3d ( -1.61803398875, -0.61803398875, 0.0 ) ; glVertex3d ( -1.61803398875, 0.61803398875, 0.0 ) ; glVertex3d ( -1.0, 1.0, -1.0 ) ;
799
glBegin ( GL_LINE_LOOP ) ;
800
glNormal3d ( 0.525731112119, 0.850650808354, 0.0 ) ; glVertex3d ( 1.61803398875, 0.61803398875, 0.0 ) ; glVertex3d ( 1.0, 1.0, -1.0 ) ; glVertex3d ( 0.0, 1.61803398875, -0.61803398875 ) ; glVertex3d ( 0.0, 1.61803398875, 0.61803398875 ) ; glVertex3d ( 1.0, 1.0, 1.0 ) ;
802
glBegin ( GL_LINE_LOOP ) ;
803
glNormal3d ( 0.525731112119, -0.850650808354, 0.0 ) ; glVertex3d ( 1.61803398875, -0.61803398875, 0.0 ) ; glVertex3d ( 1.0, -1.0, 1.0 ) ; glVertex3d ( 0.0, -1.61803398875, 0.61803398875 ) ; glVertex3d ( 0.0, -1.61803398875, -0.61803398875 ) ; glVertex3d ( 1.0, -1.0, -1.0 ) ;
805
glBegin ( GL_LINE_LOOP ) ;
806
glNormal3d ( -0.525731112119, 0.850650808354, 0.0 ) ; glVertex3d ( -1.61803398875, 0.61803398875, 0.0 ) ; glVertex3d ( -1.0, 1.0, 1.0 ) ; glVertex3d ( 0.0, 1.61803398875, 0.61803398875 ) ; glVertex3d ( 0.0, 1.61803398875, -0.61803398875 ) ; glVertex3d ( -1.0, 1.0, -1.0 ) ;
808
glBegin ( GL_LINE_LOOP ) ;
809
glNormal3d ( -0.525731112119, -0.850650808354, 0.0 ) ; glVertex3d ( -1.61803398875, -0.61803398875, 0.0 ) ; glVertex3d ( -1.0, -1.0, -1.0 ) ; glVertex3d ( 0.0, -1.61803398875, -0.61803398875 ) ; glVertex3d ( 0.0, -1.61803398875, 0.61803398875 ) ; glVertex3d ( -1.0, -1.0, 1.0 ) ;
816
void FGAPIENTRY glutSolidDodecahedron( void )
818
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidDodecahedron" );
820
/* Magic Numbers: It is possible to create a dodecahedron by attaching two pentagons to each face of
821
* of a cube. The coordinates of the points are:
822
* (+-x,0, z); (+-1, 1, 1); (0, z, x )
823
* where x = (-1 + sqrt(5))/2, z = (1 + sqrt(5))/2 or
824
* x = 0.61803398875 and z = 1.61803398875.
826
glBegin ( GL_POLYGON ) ;
827
glNormal3d ( 0.0, 0.525731112119, 0.850650808354 ) ; glVertex3d ( 0.0, 1.61803398875, 0.61803398875 ) ; glVertex3d ( -1.0, 1.0, 1.0 ) ; glVertex3d ( -0.61803398875, 0.0, 1.61803398875 ) ; glVertex3d ( 0.61803398875, 0.0, 1.61803398875 ) ; glVertex3d ( 1.0, 1.0, 1.0 ) ;
829
glBegin ( GL_POLYGON ) ;
830
glNormal3d ( 0.0, 0.525731112119, -0.850650808354 ) ; glVertex3d ( 0.0, 1.61803398875, -0.61803398875 ) ; glVertex3d ( 1.0, 1.0, -1.0 ) ; glVertex3d ( 0.61803398875, 0.0, -1.61803398875 ) ; glVertex3d ( -0.61803398875, 0.0, -1.61803398875 ) ; glVertex3d ( -1.0, 1.0, -1.0 ) ;
832
glBegin ( GL_POLYGON ) ;
833
glNormal3d ( 0.0, -0.525731112119, 0.850650808354 ) ; glVertex3d ( 0.0, -1.61803398875, 0.61803398875 ) ; glVertex3d ( 1.0, -1.0, 1.0 ) ; glVertex3d ( 0.61803398875, 0.0, 1.61803398875 ) ; glVertex3d ( -0.61803398875, 0.0, 1.61803398875 ) ; glVertex3d ( -1.0, -1.0, 1.0 ) ;
835
glBegin ( GL_POLYGON ) ;
836
glNormal3d ( 0.0, -0.525731112119, -0.850650808354 ) ; glVertex3d ( 0.0, -1.61803398875, -0.61803398875 ) ; glVertex3d ( -1.0, -1.0, -1.0 ) ; glVertex3d ( -0.61803398875, 0.0, -1.61803398875 ) ; glVertex3d ( 0.61803398875, 0.0, -1.61803398875 ) ; glVertex3d ( 1.0, -1.0, -1.0 ) ;
839
glBegin ( GL_POLYGON ) ;
840
glNormal3d ( 0.850650808354, 0.0, 0.525731112119 ) ; glVertex3d ( 0.61803398875, 0.0, 1.61803398875 ) ; glVertex3d ( 1.0, -1.0, 1.0 ) ; glVertex3d ( 1.61803398875, -0.61803398875, 0.0 ) ; glVertex3d ( 1.61803398875, 0.61803398875, 0.0 ) ; glVertex3d ( 1.0, 1.0, 1.0 ) ;
842
glBegin ( GL_POLYGON ) ;
843
glNormal3d ( -0.850650808354, 0.0, 0.525731112119 ) ; glVertex3d ( -0.61803398875, 0.0, 1.61803398875 ) ; glVertex3d ( -1.0, 1.0, 1.0 ) ; glVertex3d ( -1.61803398875, 0.61803398875, 0.0 ) ; glVertex3d ( -1.61803398875, -0.61803398875, 0.0 ) ; glVertex3d ( -1.0, -1.0, 1.0 ) ;
845
glBegin ( GL_POLYGON ) ;
846
glNormal3d ( 0.850650808354, 0.0, -0.525731112119 ) ; glVertex3d ( 0.61803398875, 0.0, -1.61803398875 ) ; glVertex3d ( 1.0, 1.0, -1.0 ) ; glVertex3d ( 1.61803398875, 0.61803398875, 0.0 ) ; glVertex3d ( 1.61803398875, -0.61803398875, 0.0 ) ; glVertex3d ( 1.0, -1.0, -1.0 ) ;
848
glBegin ( GL_POLYGON ) ;
849
glNormal3d ( -0.850650808354, 0.0, -0.525731112119 ) ; glVertex3d ( -0.61803398875, 0.0, -1.61803398875 ) ; glVertex3d ( -1.0, -1.0, -1.0 ) ; glVertex3d ( -1.61803398875, -0.61803398875, 0.0 ) ; glVertex3d ( -1.61803398875, 0.61803398875, 0.0 ) ; glVertex3d ( -1.0, 1.0, -1.0 ) ;
852
glBegin ( GL_POLYGON ) ;
853
glNormal3d ( 0.525731112119, 0.850650808354, 0.0 ) ; glVertex3d ( 1.61803398875, 0.61803398875, 0.0 ) ; glVertex3d ( 1.0, 1.0, -1.0 ) ; glVertex3d ( 0.0, 1.61803398875, -0.61803398875 ) ; glVertex3d ( 0.0, 1.61803398875, 0.61803398875 ) ; glVertex3d ( 1.0, 1.0, 1.0 ) ;
855
glBegin ( GL_POLYGON ) ;
856
glNormal3d ( 0.525731112119, -0.850650808354, 0.0 ) ; glVertex3d ( 1.61803398875, -0.61803398875, 0.0 ) ; glVertex3d ( 1.0, -1.0, 1.0 ) ; glVertex3d ( 0.0, -1.61803398875, 0.61803398875 ) ; glVertex3d ( 0.0, -1.61803398875, -0.61803398875 ) ; glVertex3d ( 1.0, -1.0, -1.0 ) ;
858
glBegin ( GL_POLYGON ) ;
859
glNormal3d ( -0.525731112119, 0.850650808354, 0.0 ) ; glVertex3d ( -1.61803398875, 0.61803398875, 0.0 ) ; glVertex3d ( -1.0, 1.0, 1.0 ) ; glVertex3d ( 0.0, 1.61803398875, 0.61803398875 ) ; glVertex3d ( 0.0, 1.61803398875, -0.61803398875 ) ; glVertex3d ( -1.0, 1.0, -1.0 ) ;
861
glBegin ( GL_POLYGON ) ;
862
glNormal3d ( -0.525731112119, -0.850650808354, 0.0 ) ; glVertex3d ( -1.61803398875, -0.61803398875, 0.0 ) ; glVertex3d ( -1.0, -1.0, -1.0 ) ; glVertex3d ( 0.0, -1.61803398875, -0.61803398875 ) ; glVertex3d ( 0.0, -1.61803398875, 0.61803398875 ) ; glVertex3d ( -1.0, -1.0, 1.0 ) ;
869
void FGAPIENTRY glutWireOctahedron( void )
871
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireOctahedron" );
874
glBegin( GL_LINE_LOOP );
875
glNormal3d( 0.577350269189, 0.577350269189, 0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, RADIUS, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS );
876
glNormal3d( 0.577350269189, 0.577350269189,-0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS ); glVertex3d( 0.0, RADIUS, 0.0 );
877
glNormal3d( 0.577350269189,-0.577350269189, 0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS ); glVertex3d( 0.0,-RADIUS, 0.0 );
878
glNormal3d( 0.577350269189,-0.577350269189,-0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0,-RADIUS, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS );
879
glNormal3d(-0.577350269189, 0.577350269189, 0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS ); glVertex3d( 0.0, RADIUS, 0.0 );
880
glNormal3d(-0.577350269189, 0.577350269189,-0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, RADIUS, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS );
881
glNormal3d(-0.577350269189,-0.577350269189, 0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0,-RADIUS, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS );
882
glNormal3d(-0.577350269189,-0.577350269189,-0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS ); glVertex3d( 0.0,-RADIUS, 0.0 );
890
void FGAPIENTRY glutSolidOctahedron( void )
892
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidOctahedron" );
895
glBegin( GL_TRIANGLES );
896
glNormal3d( 0.577350269189, 0.577350269189, 0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, RADIUS, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS );
897
glNormal3d( 0.577350269189, 0.577350269189,-0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS ); glVertex3d( 0.0, RADIUS, 0.0 );
898
glNormal3d( 0.577350269189,-0.577350269189, 0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS ); glVertex3d( 0.0,-RADIUS, 0.0 );
899
glNormal3d( 0.577350269189,-0.577350269189,-0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0,-RADIUS, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS );
900
glNormal3d(-0.577350269189, 0.577350269189, 0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS ); glVertex3d( 0.0, RADIUS, 0.0 );
901
glNormal3d(-0.577350269189, 0.577350269189,-0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, RADIUS, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS );
902
glNormal3d(-0.577350269189,-0.577350269189, 0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0,-RADIUS, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS );
903
glNormal3d(-0.577350269189,-0.577350269189,-0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS ); glVertex3d( 0.0,-RADIUS, 0.0 );
908
/* Magic Numbers: r0 = ( 1, 0, 0 )
909
* r1 = ( -1/3, 2 sqrt(2) / 3, 0 )
910
* r2 = ( -1/3, -sqrt(2) / 3, sqrt(6) / 3 )
911
* r3 = ( -1/3, -sqrt(2) / 3, -sqrt(6) / 3 )
912
* |r0| = |r1| = |r2| = |r3| = 1
913
* Distance between any two points is 2 sqrt(6) / 3
915
* Normals: The unit normals are simply the negative of the coordinates of the point not on the surface.
918
#define NUM_TETR_FACES 4
920
static GLdouble tet_r[4][3] = { { 1.0, 0.0, 0.0 },
921
{ -0.333333333333, 0.942809041582, 0.0 },
922
{ -0.333333333333, -0.471404520791, 0.816496580928 },
923
{ -0.333333333333, -0.471404520791, -0.816496580928 } } ;
925
static GLint tet_i[4][3] = /* Vertex indices */
927
{ 1, 3, 2 }, { 0, 2, 3 }, { 0, 3, 1 }, { 0, 1, 2 }
933
void FGAPIENTRY glutWireTetrahedron( void )
935
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireTetrahedron" );
937
glBegin( GL_LINE_LOOP ) ;
938
glNormal3d ( -tet_r[0][0], -tet_r[0][1], -tet_r[0][2] ) ; glVertex3dv ( tet_r[1] ) ; glVertex3dv ( tet_r[3] ) ; glVertex3dv ( tet_r[2] ) ;
939
glNormal3d ( -tet_r[1][0], -tet_r[1][1], -tet_r[1][2] ) ; glVertex3dv ( tet_r[0] ) ; glVertex3dv ( tet_r[2] ) ; glVertex3dv ( tet_r[3] ) ;
940
glNormal3d ( -tet_r[2][0], -tet_r[2][1], -tet_r[2][2] ) ; glVertex3dv ( tet_r[0] ) ; glVertex3dv ( tet_r[3] ) ; glVertex3dv ( tet_r[1] ) ;
941
glNormal3d ( -tet_r[3][0], -tet_r[3][1], -tet_r[3][2] ) ; glVertex3dv ( tet_r[0] ) ; glVertex3dv ( tet_r[1] ) ; glVertex3dv ( tet_r[2] ) ;
948
void FGAPIENTRY glutSolidTetrahedron( void )
950
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidTetrahedron" );
952
glBegin( GL_TRIANGLES ) ;
953
glNormal3d ( -tet_r[0][0], -tet_r[0][1], -tet_r[0][2] ) ; glVertex3dv ( tet_r[1] ) ; glVertex3dv ( tet_r[3] ) ; glVertex3dv ( tet_r[2] ) ;
954
glNormal3d ( -tet_r[1][0], -tet_r[1][1], -tet_r[1][2] ) ; glVertex3dv ( tet_r[0] ) ; glVertex3dv ( tet_r[2] ) ; glVertex3dv ( tet_r[3] ) ;
955
glNormal3d ( -tet_r[2][0], -tet_r[2][1], -tet_r[2][2] ) ; glVertex3dv ( tet_r[0] ) ; glVertex3dv ( tet_r[3] ) ; glVertex3dv ( tet_r[1] ) ;
956
glNormal3d ( -tet_r[3][0], -tet_r[3][1], -tet_r[3][2] ) ; glVertex3dv ( tet_r[0] ) ; glVertex3dv ( tet_r[1] ) ; glVertex3dv ( tet_r[2] ) ;
963
static double icos_r[12][3] = {
965
{ 0.447213595500, 0.894427191000, 0.0 },
966
{ 0.447213595500, 0.276393202252, 0.850650808354 },
967
{ 0.447213595500, -0.723606797748, 0.525731112119 },
968
{ 0.447213595500, -0.723606797748, -0.525731112119 },
969
{ 0.447213595500, 0.276393202252, -0.850650808354 },
970
{ -0.447213595500, -0.894427191000, 0.0 },
971
{ -0.447213595500, -0.276393202252, 0.850650808354 },
972
{ -0.447213595500, 0.723606797748, 0.525731112119 },
973
{ -0.447213595500, 0.723606797748, -0.525731112119 },
974
{ -0.447213595500, -0.276393202252, -0.850650808354 },
978
static int icos_v [20][3] = {
1001
void FGAPIENTRY glutWireIcosahedron( void )
1005
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireIcosahedron" );
1007
for ( i = 0; i < 20; i++ )
1010
normal[0] = ( icos_r[icos_v[i][1]][1] - icos_r[icos_v[i][0]][1] ) * ( icos_r[icos_v[i][2]][2] - icos_r[icos_v[i][0]][2] ) - ( icos_r[icos_v[i][1]][2] - icos_r[icos_v[i][0]][2] ) * ( icos_r[icos_v[i][2]][1] - icos_r[icos_v[i][0]][1] ) ;
1011
normal[1] = ( icos_r[icos_v[i][1]][2] - icos_r[icos_v[i][0]][2] ) * ( icos_r[icos_v[i][2]][0] - icos_r[icos_v[i][0]][0] ) - ( icos_r[icos_v[i][1]][0] - icos_r[icos_v[i][0]][0] ) * ( icos_r[icos_v[i][2]][2] - icos_r[icos_v[i][0]][2] ) ;
1012
normal[2] = ( icos_r[icos_v[i][1]][0] - icos_r[icos_v[i][0]][0] ) * ( icos_r[icos_v[i][2]][1] - icos_r[icos_v[i][0]][1] ) - ( icos_r[icos_v[i][1]][1] - icos_r[icos_v[i][0]][1] ) * ( icos_r[icos_v[i][2]][0] - icos_r[icos_v[i][0]][0] ) ;
1013
glBegin ( GL_LINE_LOOP ) ;
1014
glNormal3dv ( normal ) ;
1015
glVertex3dv ( icos_r[icos_v[i][0]] ) ;
1016
glVertex3dv ( icos_r[icos_v[i][1]] ) ;
1017
glVertex3dv ( icos_r[icos_v[i][2]] ) ;
1025
void FGAPIENTRY glutSolidIcosahedron( void )
1029
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidIcosahedron" );
1031
glBegin ( GL_TRIANGLES ) ;
1032
for ( i = 0; i < 20; i++ )
1035
normal[0] = ( icos_r[icos_v[i][1]][1] - icos_r[icos_v[i][0]][1] ) * ( icos_r[icos_v[i][2]][2] - icos_r[icos_v[i][0]][2] ) - ( icos_r[icos_v[i][1]][2] - icos_r[icos_v[i][0]][2] ) * ( icos_r[icos_v[i][2]][1] - icos_r[icos_v[i][0]][1] ) ;
1036
normal[1] = ( icos_r[icos_v[i][1]][2] - icos_r[icos_v[i][0]][2] ) * ( icos_r[icos_v[i][2]][0] - icos_r[icos_v[i][0]][0] ) - ( icos_r[icos_v[i][1]][0] - icos_r[icos_v[i][0]][0] ) * ( icos_r[icos_v[i][2]][2] - icos_r[icos_v[i][0]][2] ) ;
1037
normal[2] = ( icos_r[icos_v[i][1]][0] - icos_r[icos_v[i][0]][0] ) * ( icos_r[icos_v[i][2]][1] - icos_r[icos_v[i][0]][1] ) - ( icos_r[icos_v[i][1]][1] - icos_r[icos_v[i][0]][1] ) * ( icos_r[icos_v[i][2]][0] - icos_r[icos_v[i][0]][0] ) ;
1038
glNormal3dv ( normal ) ;
1039
glVertex3dv ( icos_r[icos_v[i][0]] ) ;
1040
glVertex3dv ( icos_r[icos_v[i][1]] ) ;
1041
glVertex3dv ( icos_r[icos_v[i][2]] ) ;
1050
static double rdod_r[14][3] = {
1052
{ 0.707106781187, 0.000000000000, 0.5 },
1053
{ 0.000000000000, 0.707106781187, 0.5 },
1054
{ -0.707106781187, 0.000000000000, 0.5 },
1055
{ 0.000000000000, -0.707106781187, 0.5 },
1056
{ 0.707106781187, 0.707106781187, 0.0 },
1057
{ -0.707106781187, 0.707106781187, 0.0 },
1058
{ -0.707106781187, -0.707106781187, 0.0 },
1059
{ 0.707106781187, -0.707106781187, 0.0 },
1060
{ 0.707106781187, 0.000000000000, -0.5 },
1061
{ 0.000000000000, 0.707106781187, -0.5 },
1062
{ -0.707106781187, 0.000000000000, -0.5 },
1063
{ 0.000000000000, -0.707106781187, -0.5 },
1067
static int rdod_v [12][4] = {
1082
static double rdod_n[12][3] = {
1083
{ 0.353553390594, 0.353553390594, 0.5 },
1084
{ -0.353553390594, 0.353553390594, 0.5 },
1085
{ -0.353553390594, -0.353553390594, 0.5 },
1086
{ 0.353553390594, -0.353553390594, 0.5 },
1087
{ 0.000000000000, 1.000000000000, 0.0 },
1088
{ -1.000000000000, 0.000000000000, 0.0 },
1089
{ 0.000000000000, -1.000000000000, 0.0 },
1090
{ 1.000000000000, 0.000000000000, 0.0 },
1091
{ 0.353553390594, 0.353553390594, -0.5 },
1092
{ -0.353553390594, 0.353553390594, -0.5 },
1093
{ -0.353553390594, -0.353553390594, -0.5 },
1094
{ 0.353553390594, -0.353553390594, -0.5 }
1097
void FGAPIENTRY glutWireRhombicDodecahedron( void )
1101
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireRhombicDodecahedron" );
1103
for ( i = 0; i < 12; i++ )
1105
glBegin ( GL_LINE_LOOP ) ;
1106
glNormal3dv ( rdod_n[i] ) ;
1107
glVertex3dv ( rdod_r[rdod_v[i][0]] ) ;
1108
glVertex3dv ( rdod_r[rdod_v[i][1]] ) ;
1109
glVertex3dv ( rdod_r[rdod_v[i][2]] ) ;
1110
glVertex3dv ( rdod_r[rdod_v[i][3]] ) ;
1118
void FGAPIENTRY glutSolidRhombicDodecahedron( void )
1122
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidRhombicDodecahedron" );
1124
glBegin ( GL_QUADS ) ;
1125
for ( i = 0; i < 12; i++ )
1127
glNormal3dv ( rdod_n[i] ) ;
1128
glVertex3dv ( rdod_r[rdod_v[i][0]] ) ;
1129
glVertex3dv ( rdod_r[rdod_v[i][1]] ) ;
1130
glVertex3dv ( rdod_r[rdod_v[i][2]] ) ;
1131
glVertex3dv ( rdod_r[rdod_v[i][3]] ) ;
1137
void FGAPIENTRY glutWireSierpinskiSponge ( int num_levels, GLdouble offset[3], GLdouble scale )
1141
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireSierpinskiSponge" );
1143
if ( num_levels == 0 )
1146
for ( i = 0 ; i < NUM_TETR_FACES ; i++ )
1148
glBegin ( GL_LINE_LOOP ) ;
1149
glNormal3d ( -tet_r[i][0], -tet_r[i][1], -tet_r[i][2] ) ;
1150
for ( j = 0; j < 3; j++ )
1152
double x = offset[0] + scale * tet_r[tet_i[i][j]][0] ;
1153
double y = offset[1] + scale * tet_r[tet_i[i][j]][1] ;
1154
double z = offset[2] + scale * tet_r[tet_i[i][j]][2] ;
1155
glVertex3d ( x, y, z ) ;
1161
else if ( num_levels > 0 )
1163
GLdouble local_offset[3] ; /* Use a local variable to avoid buildup of roundoff errors */
1166
for ( i = 0 ; i < NUM_TETR_FACES ; i++ )
1168
local_offset[0] = offset[0] + scale * tet_r[i][0] ;
1169
local_offset[1] = offset[1] + scale * tet_r[i][1] ;
1170
local_offset[2] = offset[2] + scale * tet_r[i][2] ;
1171
glutWireSierpinskiSponge ( num_levels, local_offset, scale ) ;
1176
void FGAPIENTRY glutSolidSierpinskiSponge ( int num_levels, GLdouble offset[3], GLdouble scale )
1180
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidSierpinskiSponge" );
1182
if ( num_levels == 0 )
1184
glBegin ( GL_TRIANGLES ) ;
1186
for ( i = 0 ; i < NUM_TETR_FACES ; i++ )
1188
glNormal3d ( -tet_r[i][0], -tet_r[i][1], -tet_r[i][2] ) ;
1189
for ( j = 0; j < 3; j++ )
1191
double x = offset[0] + scale * tet_r[tet_i[i][j]][0] ;
1192
double y = offset[1] + scale * tet_r[tet_i[i][j]][1] ;
1193
double z = offset[2] + scale * tet_r[tet_i[i][j]][2] ;
1194
glVertex3d ( x, y, z ) ;
1200
else if ( num_levels > 0 )
1202
GLdouble local_offset[3] ; /* Use a local variable to avoid buildup of roundoff errors */
1205
for ( i = 0 ; i < NUM_TETR_FACES ; i++ )
1207
local_offset[0] = offset[0] + scale * tet_r[i][0] ;
1208
local_offset[1] = offset[1] + scale * tet_r[i][1] ;
1209
local_offset[2] = offset[2] + scale * tet_r[i][2] ;
1210
glutSolidSierpinskiSponge ( num_levels, local_offset, scale ) ;
1215
/*** END OF FILE ***/