| 27 |
|
|
| 28 |
|
/* |
| 29 |
|
* First, we find the distance to the plane containing the |
| 30 |
< |
* face. If this distance is less than zero or greater |
| 31 |
< |
* than a previous intersection, we return. Otherwise, |
| 30 |
> |
* face. If the plane is parallel to our ray, or the |
| 31 |
> |
* previous hit was better, we return. Otherwise, |
| 32 |
|
* we determine whether in fact the ray intersects the |
| 33 |
|
* face. The ray intersects the face if the |
| 34 |
|
* point of intersection with the plane of the face |
| 36 |
|
*/ |
| 37 |
|
/* compute dist. to plane */ |
| 38 |
|
rdot = -DOT(r->rdir, f->norm); |
| 39 |
< |
if (rdot <= FTINY && rdot >= -FTINY) /* ray parallels plane */ |
| 40 |
< |
t = FHUGE; |
| 41 |
< |
else |
| 42 |
< |
t = (DOT(r->rorg, f->norm) - f->offset) / rdot; |
| 39 |
> |
if ((rdot <= FTINY) & (rdot >= -FTINY)) /* ray parallels plane */ |
| 40 |
> |
return(0); |
| 41 |
> |
|
| 42 |
> |
t = (DOT(r->rorg, f->norm) - f->offset) / rdot; |
| 43 |
|
|
| 44 |
< |
if (t <= FTINY || t >= r->rot) /* not good enough */ |
| 44 |
> |
if (rayreject(o, r, t)) /* previous hit is better? */ |
| 45 |
|
return(0); |
| 46 |
|
/* compute intersection */ |
| 47 |
|
VSUM(pisect, r->rorg, r->rdir, t); |
