28 |
|
#define UP 04 |
29 |
|
#define DOWN 010 |
30 |
|
|
31 |
< |
double funvalue(), l_hermite(), argument(); |
31 |
> |
double funvalue(), l_hermite(), l_bezier(), argument(); |
32 |
|
|
33 |
|
|
34 |
|
main(argc, argv) |
45 |
|
|
46 |
|
varset("PI", PI); |
47 |
|
funset("hermite", 5, l_hermite); |
48 |
+ |
funset("bezier", 5, l_bezier); |
49 |
|
|
50 |
|
if (argc < 6) |
51 |
|
goto userror; |
67 |
|
nseg = atoi(argv[5]); |
68 |
|
if (nseg <= 0) |
69 |
|
goto userror; |
70 |
< |
modname = smooth ? "phong" : argv[1]; |
70 |
> |
modname = smooth ? "Phong" : argv[1]; |
71 |
|
|
72 |
|
printhead(argc, argv); |
73 |
|
|
99 |
|
if (!orient) |
100 |
|
goto endfor; |
101 |
|
if (smooth) { |
102 |
< |
printf("\n%s texfunc phong\n", argv[1]); |
102 |
> |
printf("\n%s texfunc Phong\n", argv[1]); |
103 |
|
printf("4 rev_dx rev_dy rev_dz rev.cal\n"); |
104 |
|
printf("0\n4\n"); |
105 |
|
if (orient&(UP|DOWN)) { |
211 |
|
argument(2)*(-2.0*t+3.0)*t*t + |
212 |
|
argument(3)*((t-2.0)*t+1.0)*t + |
213 |
|
argument(4)*(t-1.0)*t*t ); |
214 |
+ |
} |
215 |
+ |
|
216 |
+ |
|
217 |
+ |
double |
218 |
+ |
l_bezier() |
219 |
+ |
{ |
220 |
+ |
double t; |
221 |
+ |
|
222 |
+ |
t = argument(5); |
223 |
+ |
return( argument(1) * (1.+t*(-3.+t*(3.-t))) + |
224 |
+ |
argument(2) * 3.*t*(1.+t*(-2.+t)) + |
225 |
+ |
argument(3) * 3.*t*t*(1.-t) + |
226 |
+ |
argument(4) * t*t*t ); |
227 |
|
} |