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/* Return the closest base object intersecting the given ray, and
the curvilinear abscissa t of the intersection point.
Return NULL if no intersection.
Return t = 0.0 if the viewpoint (origin of the ray) is inside an
object. */
struct object * intersect_ray(struct point * p,
struct vector * v,
struct object * obj,
int initial,
/*out*/ flt * t);
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