Shoot a semi-finite ray into a collection of shapes.

Input parameters:

1. Ry → Line representing the start of the semi-finite ray.
2. Sh → Shapes to hit.
3. Of → Offset distance at the start of the ray.

Output parameters:

1. Pt → First intersection point along the semi-infinite ray.
2. Ix → Index of the shape which was hit.
3. Tn → Tangent at intersection. Either a vector or a plane, depending on the kind of shape that was hit.
4. Pp → Perpendicular at intersection. Either a vector or a plane, depending on the kind of shape that was hit.