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Voxel (AABB) ray intersection

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Hi, I want to know if there''s a fast way to compute the in and out vectors of a ray and a 1x1x1 voxel axis aligned? The voxels are also on integer boundaries, ie 1st voxel is (0,0,0)-(1,1,1) etc. Presently, I use a brute-force algorithm, which works, but it''s really slow. In fact, all I want to know is the distance that the ray covers inside the voxel. Thanks for any helps, Jean-Francois

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