Find all the points (spheres) intersected by the ray, and return them ordered by the distance to the Ray (closest first).
The spheres are defined with a radius and an array of points in the pointsArr array
The pointsArr array contains a number of sphere centers in a 1d array: <s1.x, s1.y, s1.z, s2.x, s2.y, s2.z> ...
Returns the index of the closest intersected sphere to the ray
The spheres are defined with a radius and an array of points in the pointsArr array
The pointsArr array contains a number of sphere centers in a 1d array: <s1.x, s1.y, s1.z, s2.x, s2.y, s2.z> ...
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Helper class for computing the intersection between a ray and number of points with a given threshold (the radius).