| 12 |
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#include "rtotypes.h" |
| 13 |
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|
| 14 |
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|
| 15 |
< |
extern int |
| 15 |
> |
int |
| 16 |
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o_sphere( /* compute intersection with sphere */ |
| 17 |
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OBJREC *so, |
| 18 |
< |
register RAY *r |
| 18 |
> |
RAY *r |
| 19 |
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) |
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{ |
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double a, b, c; /* coefficients for quadratic equation */ |
| 22 |
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double root[2]; /* quadratic roots */ |
| 23 |
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int nroots; |
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double t; |
| 25 |
< |
register RREAL *ap; |
| 26 |
< |
register int i; |
| 25 |
> |
RREAL *ap; |
| 26 |
> |
int i; |
| 27 |
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|
| 28 |
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if (so->oargs.nfargs != 4) |
| 29 |
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objerror(so, USER, "bad # arguments"); |
| 63 |
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break; |
| 64 |
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if (i >= nroots) |
| 65 |
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return(0); /* no positive root */ |
| 66 |
< |
|
| 67 |
< |
if (t >= r->rot) |
| 68 |
< |
return(0); /* other is closer */ |
| 66 |
> |
if (rayreject(so, r, t, 0)) |
| 67 |
> |
return(0); /* previous hit better */ |
| 68 |
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|
| 69 |
|
r->ro = so; |
| 70 |
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r->rot = t; |
