| 8 |
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#include "copyright.h" |
| 9 |
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| 10 |
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#include "ray.h" |
| 11 |
– |
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| 11 |
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#include "otypes.h" |
| 12 |
< |
|
| 12 |
> |
#include "rtotypes.h" |
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#include "cone.h" |
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|
| 15 |
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| 16 |
< |
o_cone(o, r) /* intersect ray with cone */ |
| 17 |
< |
OBJREC *o; |
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< |
register RAY *r; |
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> |
extern int |
| 17 |
> |
o_cone( /* intersect ray with cone */ |
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> |
OBJREC *o, |
| 19 |
> |
register RAY *r |
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> |
) |
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{ |
| 22 |
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FVECT rox, rdx; |
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double a, b, c; |
| 127 |
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for (i = 0; i < 3; i++) |
| 128 |
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r->ron[i] = (co->al*r->ron[i] - c*co->ad[i]) |
| 129 |
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/co->sl; |
| 130 |
+ |
a = DOT(r->ron, r->ron); |
| 131 |
+ |
if (a > 1.+FTINY || a < 1.-FTINY) { |
| 132 |
+ |
c = 1./(.5 + .5*a); /* avoid numerical error */ |
| 133 |
+ |
r->ron[0] *= c; r->ron[1] *= c; r->ron[2] *= c; |
| 134 |
+ |
} |
| 135 |
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r->rod = -DOT(r->rdir, r->ron); |
| 136 |
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r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
| 137 |
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r->uv[0] = r->uv[1] = 0.0; |
