create a search structure from a matrix of coordinates and one of directional vectors to be processed by vcgRaySearch

1 | ```
setRays(coords, dirs)
``` |

`coords` |
k x 3 matrix (or a vector of length 3) containing the starting points of the rays |

`dirs` |
k x 3 matrix (or a vector of length 3) containing the directons of the rays. The i-th row of |

an object of class "mesh3d" (without faces) and the vertices representing the starting points of the rays and the normals storing the directions.

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