Question

I have two 3-D points.
Example:

float[] point1 = new float[3] {1.3919023, 6.12837912, 10.391283};
float[] point2 = new float[3] {48.3818, 38.38182, 318.381823};

Anyone an idea for an algorithm to calculate the distance in float between the points?

Answer 1

The Euclidean distance between two 3D points is:

float deltaX = x1 - x0;
float deltaY = y1 - y0;
float deltaZ = z1 - z0;

float distance = (float) Math.Sqrt(deltaX * deltaX + deltaY * deltaY + deltaZ * deltaZ);

And in N dimensions (untested and vulnerable to overflow):

float DistanceN(float[] first, float[] second) {
  var sum = first.Select((x, i) => (x - second[i]) * (x - second[i])).Sum();
  return Math.Sqrt(sum);
}

Edit: I much prefer the Zip solution posted by dasblinkenlight below!